Answer:
B. second site suppressing mutation
Explanation:
The second site of the repression mutation as 96 percent showed the small colonies that tells the growth was not the good as the agar that allowed the growth of the only wild type of strains. So it was not a true reversion to a wild type.
And because the small colony is visible, it means that there are some growth which means that some of the strains tried to turn back in the wild type.
Based on this data, you conclude that the stock's reversion to rII+ was the result of - B. second site suppressing mutation.
The second site mutationa double mutation within a gene.normally the second-site mutation suppresses the first mutation so that the double mutant has the wild-type phenotype.True reversionA mutation that precisely restores a mutant DNA sequence to the wild-type DNA sequencehere in this case there is already a frameshift mutation present and mutagenized with proflavin and plated on a lawn of E. coli K.
we know these plate plates only allow phenotypically wild-type phages to grow.here just 96% showed small colonies which indicate second site suppressing mutationit shows that growth was not that brilliant as the agar allowed the growth of only wild-type strains, therefore, it was not a true reversion to the wild type. And since a small colony was visible means there was some growth meaning some strains tried to turn back to the wild type.Thus, Based on this data, you conclude that the stocks reversion to rII+ was the result of: B. second site suppressing mutation.
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A number of studies are carried out in order to verify if there is a relation between the death rate by cardiac diseases ánd the cholesterol level in the blood.The results are shoen in the adjacent graph..
1) explain the relation between the level of blood cholesterol and the risk of cardiac accident
2) firmulate the hypothesis tested in this study
3) what do you conclude concerning the formulated hypothesis?
Answer:
The correct answer is :
1. increase in cholesterol level leads to more death due to cardiac disease.
2. Hypothesis: "if the cholesterol level is high in an individual, then the risk of death due to cardiac disease is high"
3. Everyone should limit or control their cholesterol level to avoid cardiac disease or it might be lethal.
Explanation:
In this graph, it is represented that there is an increase in the deaths due to cardiac disease with the increase in the cholesterol in the body. The death increase slowly up to 2.5 gL and after that, there is a huge spike in death, which explains that the higher the cholesterol level higher the chances or risk of death due to cardiac disease.
Hypothesis: "if the cholesterol level is high in an individual, then the risk of death due to cardiac disease is high"
On the basis of this one should control its body cholesterol to avoid the chances of cardiac disease as it may lead to death.
A 44 year old man was admitted to the hospital following a 2 week history of low grade fever, malaise, and anorexia. Examination of a Giemsa stained blood film revealed many intraerythrocytic parasites. Further history revealed frequent camping trips near Martha's Vineyard and Nantucket Island, but no travel outside the continental United States. This parasite could easily be confused with:_________.
a. Babesia microti
b. Leishmania donovani
c. Plasmodium ovale
d. Toxoplasma gondii
e. none of these
Answer: OPTION C (Plasmodium ovale)
Explanation: The symptoms of the infection is also seen in the listed intraerythrocytic protozoans in the options. However, the travel history of the man establishes that the man wasn't exposed to an intraerythrocytic protozoans which isn't endemic in the United States, and considering the man's trip around vineyard and island which can serve as breeding site of mosquitoes (vector of Plasmodium spp) makes this parasite easily confused with Plasmodium ovale.
What does measles cause by
Answer:Measles is a highly contagious virus that lives in the nose and throat mucus of an infected person. It can spread to others through coughing and sneezing. If other people breathe the contaminated air or touch the infected surface, then touch their eyes, noses, or mouths, they can become infected.Measles is caused by a virus in the paramyxovirus family and it is normally passed through direct contact and through the air. The virus infects the respiratory tract, then spreads throughout the body. Measles is a human disease and is not known to occur in animals.
It usually begins as flat red spots that appear on the face at the hairline and spread downward to the neck, trunk, arms, legs, and feet. Small raised bumps may also appear on top of the flat red spots. The spots may become joined together as they spread from the head to the rest of the body.
Explanation:
Answer: GoodMorning: ) ✨ Measles is a highly contagious virus that lives in the nose and throat mucus of an infected person. It can spread to others through coughing and sneezing. If other people breathe the contaminated air or touch the infected surface, then touch their eyes, noses, or mouths, they can become infected.Measles is caused by a virus in the paramyxovirus family and it is normally passed through direct contact and through the air. The virus infects the respiratory tract, then spreads throughout the body. Measles is a human disease and is not known to occur in animals.
It usually begins as flat red spots that appear on the face at the hairline and spread downward to the neck, trunk, arms, legs, and feet. Small raised bumps may also appear on top of the flat red spots. The spots may become joined together as they spread from the head to the rest of the body.
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4. Do you think that adding more enzymes to a solution would increase the rate of reaction? Why or why not?
Answer:
By increasing the enzyme concentration, the maximum reaction rate greatly increases. Conclusions: The rate of a chemical reaction increases as the substrate concentration increases. Enzymes can greatly speed up the rate of a reaction.
what are three animals that have good regeneration abilities? Describe the regeneration abilities of one of the animals in atleast 3 sentences
Answer:
i will give you a few options
Explanation:
Lizards who lose all or part of their tails can grow new ones. ...
Planarians are flat worms. ...
Sea cucumbers have bodies that can grow to be three feet long. ...
Sharks continually replace lost teeth. ...
Spiders can regrow missing legs or parts of legs.
Sponges can be divided
Answer Starfish
These five-limbed creatures can regrow arms that detach from their central disc, and some species have even been observed to complete the process in reverse: regrowing an entire body from a lost arm. To do this the starfish will store nutrients in the arm until it is able to regrow its
Mexican tetra
Researchers in Mexico last week described how they are studying cave-dwelling tetra fish to better understand why some animals can regenerate tissue but others can’t. The scientists performed surgery to remove some of the heart of river fish and cave fish from the species Astyanax mexicanus, finding that while some river fish do regenerate tissue, the cave fish just grew scars over the damage.
Salamander
The amphibious salamander can regrow a lost tail to full length. This process sees cells migrating to the wound and then slowly regenerating the tail within a few weeks. The finished appendage is completely functional and has all the features of the original, with the spinal cord and nerves growing back too.
Axolotl
A relative of the salamander but even more skilled at regenerating is the axolotl. This animal can regenerate not just its tail but also limbs, skin and almost any other body part. Researchers found that each time a limb was removed, it regrew almost perfectly. The pale pink creature has since become the focus of research into human limb regeneration.
Mexican tetra
Researchers in Mexico last week described how they are studying cave-dwelling tetra fish to better understand why some animals can regenerate tissue but others can’t. The scientists performed surgery to remove some of the heart of river fish and cave fish from the species Astyanax Mexicans , finding that while some river fish do regenerate tissue, the cave fish just grew scars over the damage.
What skills are needed to an Executive Director of Animal Research?
Answer:
The Executive Director also serves as the Attending Veterinarian, and is responsible for long-range planning, leadership, and oversight of animal care and use at UC Davis. The position manages and strategically harmonizes the distributed operations of over 1 million square feet of animal holding space in 200+ buildings that are overseen by individual vivarium managers.
The Executive Director leads a team of stakeholders that are responsible for identifying solutions that balance multiple and often-competing resource priorities. Cabinet members may include the Sr. Associate Vice Chancellor-Planning, Delivery and Facilities; Sr Associate Vice Chancellor-Finance and Resource Management; Institutional Animal Care and Use Committee (IACUC) Chair; IACUC Administrator; Associate Vice Chancellor-Facilities Management; a Vivarium Facility Manager Representative; Office of Research Representative; User Group representation; and Faculty Advisors designated by the Academic Senate. Each cabinet member (stakeholder) has an equal voice to identify issues and advocate for their respective constituencies but with the equally important responsibility of finding solutions that balance multiple, and often competing, resource priorities and the overriding campus needs.
The Executive Director serves in a public information, training, consultative, and facilitating role on behalf of the University's programs of animal care and use. The Executive Director supports the academic mission by assuring compliance with all applicable federal, state, and local animal welfare regulations that govern the use of animals in research and teaching. The Executive Director works in collaboration with the IACUC and IACUC staff to ensure regulatory matters are addressed, and that animal welfare and research facilitation are balanced with efficient daily operations and long-range academic and facility needs. The Executive Director provides advice to campus animal facility management, animal users, and administration regarding current standards for research and animal care. Serves as an ad-hoc member of the Institutional Biosafety Committee and is required by law as the Attending Veterinarian to serve as a voting member of the IACUC. May also serve as a member of the Ca Dept of Fish & Wildlife Animal Welfare Committee. The Executive Director oversees TRACS (Teaching and Research Animal Care Services); the entity that provides husbandry services to the majority of laboratory animal users on the Davis and Sacramento campuses. The Executive Director supervises the Associate Directors responsible for Campus Veterinary Services (CVS) and Husbandry Services (HS). CVS consists of three senior veterinarians and four veterinary technicians as well as several student employees. These services provide routine veterinary care and project support for most research and teaching animals on and off the UC Davis campus; and are responsible for the Laboratory Animal Residency Program that provides post-doctoral training for veterinarians who wish to specialize in Laboratory Animal Medicine. Physical Demands: - Walk, crouch, kneel, bend, and lift heavy items or animals up to 50 lbs.
- Stand for long periods on hard surfaces (e. g., clinical facilities, surgical suites).
- Lift, move, and bend in the restraint and treatment of laboratory animals. Work Environment: - USDA endorsement or attainment within 1 year of hire. - Valid CA driver's license required. Position will participate in the Department of Motor Vehicles (DMV) Pull Notice System.
- Rabies Vaccination and/or titer, Hepatitis B Vaccination and/or titer other titers/vaccinations as recommended by occupational health physician.
- TB test or chest x-ray, measles vaccination or proof of illness is required prior to employment and annually thereafter.
- Employee is personally responsible for following health and safety guidelines/instructions.
- Must be able to perform assigned duties wearing restrictive protective clothing such as respirators and other personal protective clothing.
- This position is subject to Medical Surveillance procedures and review in accordance with Federal and State Laws and Regulations and University Policy.
- Work flexible schedule.
This position is a critical position and subject to a background check. Employment is contingent upon successful completion of background investigation including criminal history and identity checks. Yes Qualifications Minimum Qualifications: - Doctor of Veterinary Medicine degree (DVM) from a recognized and accredited school of veterinary medicine; Licensed DVM in a state, with the attainment of CA license within 1 year of employment
After determining the question or problem to be answered you should
A- construst a hypothesis
B- do background research
C- communicate the results
D- collect data
What is the difference between Desserts, Grasslands and Forests?
Answer:
yaeh
Explanation:
Forests occupy the most favourable environments, where moisture is adequate for growth and survival of a tall, dense vegetation dominated by trees. Deserts are found where moisture is so lacking that a continuous, permanent vegetation cover cannot be maintained. Grasslands lie between these two extremes
Explanation:
Desserts: A desolate terrain, especially one with little water or vegetation; a wasteland.
Grassland: An area dominated by grass or grasslike vegetation.
Forest: A dense collection of trees covering a relatively large area. Larger than woods.
HELP BRAINLIEST! 25 POINTS
Humans take longer to change the earth's surface than plants take.
True
False
Answer:
true .......... hopefully
Answer:
False
Explanation:
Humans have technology and alot of other stuff while plants are only have natural resources
How can mutations be harmful?
Answer:
It can be harmful in many ways
Explanation:
When a mutation alters a protein that plays a critical role in the body, it can disrupt normal development or cause a medical condition. A condition caused by mutations in one or more genes is called a genetic disorder. In some cases, gene mutations are so severe that they prevent an embryo from surviving until birth.
Answer:
Mutations could be harmful if they change the codes for protein synthesis in such a way that a particular protein will not be able to conduct its routine function and will cause ailment. However not all mutations are harmful, there are very few number of mutations that actually can change the codes for a better functioning protein.
Explanation:
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plzz help me to do this please
Answer:
idek
Explanation:
What does cell theory refer to
Answer:
Cell theory refers to the idea that cells are the basic unit of structure in every living thing. Development of this theory during the mid 17th century was made possible by advances in microscopy. This theory is one of the foundations of biology.
during what part of the mitosis process does the dna replicate
Answer:
In the interphase
Explanation:
i. Identify an environmental problem associated with large-scale intensive agriculture on soil.
Intensive agriculture is resulting in the loss of ecosystem and is contributing to global warming.
• An agricultural mechanization and intensification system, whose main objective is to increase the productivity from the accessible land via several means like heavy use of chemical fertilizers and pesticides is known as intensive agriculture.
• The intensive agriculture is generally aimed to feed large population of humans, however, the method has contributed as one of the biggest threat to global environment, as it is resulting in the loss of ecosystem and global warming.
• It is accountable for the 80 percent of the tropical deforestation and emergence of novel parasites and reemergence of the parasites, which were under control at one time.
• The intensive farming hampers the beneficial plants and insects, and depletes and degrades the soil it relies upon.
• It is resulting in soil erosion and is resulting in the genetic erosion of the livestock species and crops around the globe.
Thus, intensive farming in order to feed large populations is eradicating the world agriculture slowly and gradually.
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Which type of bond connects the amino acids?
The cell membrane is a protective external layer that controls
which substances are allowed to enter and leave the cell. The
cell membrane performs the same function in the cell as which
structure in the human body?
Blood
Skeleton
Skin
Hair
Answer:
Skin
Explanation:
Skin is the protective external layer in the human body that allows substances such as water to leave/enter.
Scientists want to determine whether the rapid economic growth in China between 1950 and 2000 caused a mass extinction of animal species during that time period. A mass extinction event is considered to occur when the rate of species extinction for exceeds the background extinction rate. The scientists collected data on the number of extinctions of selected vertebrate species in China between 1950 and 2000, as shown in below Table . Extinction rates were ascertained by measuring the werage percent of species lost(PSL).
The average percent of extinctions of 252 protected vertebrate specles in 2,365 countles in China from 1950 to 2000.
Mammals Birds Amphibians and Reptiles Background Rate
Average PSL ± 1 standard deviation 47.4 ± 339 19.75 ± 17.70 28.80 ± 28.86 27.21 ± 16.26
Which of the following is the null hypothesis most relevant for evaluating the data in Table?
a. There is no significant difference between the extinction rate of animals between 1950 and 2000 in China and the background extinction rate.
b. There is no significant difference between the extinction rates of mammals, birds, amphibians, and reptiles in China.
c. There is a significant difference between the extinction rate for mammals in China and the background extinction rate for mammals.
d. Because of climate change, habitat loss, pollution, and excessive exploitation of resources, China experienced a mass extinction event between 1950 and 2000.
Answer:
A
Explanation:
The null hypothesis is otherwise known as the hypothesis of no difference. In other words, the null hypothesis assumes that there is no significant difference between two or more data from populations that are being statistically compared. This is as opposed to the alternate hypothesis that assumes that there is a statistically significant difference between the data from the population being compared.
In the illustration, it is clearly stated that a mass extinction event occurs when the rate of species extinction exceeds the background extinction rate. Hence, the data collected on the extinction rates of different mammals need to be compared with that of the background extinction rate, and only a significantly higher extinction rate of the animals can lead to the conclusion that mass extinction has occurred.
The null hypothesis, therefore, would be that there is no significant difference between the extinction rates of the various animals and the background extinction.
The correct option is A.
The correct null hypothesis is "There is no significant difference in the rate of extinction of animals between 1950-2000 in China". Option A is correct.
The null hypothesis:It assumes that there is no difference between the two or more data that has been collected from the population and being statistically compared.
In the given scenario,
Scientists are looking for extinction rate differences of animal species between 1950 to 2000. Hence, option A is correct.Scientists are looking at the data as a whole not just as individual groups. Hence options B, C, and D are incorrect.Therefore, the correct null hypothesis is "There is no significant difference in the rate of extinction of animals between 1950-2000 in China".
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Refer to the food web above to answer the following: hunting has significantly reduced the snake population. Explain at least two possible effects this will have on the ecosystem.
Answer:
I would need to see the food web to provide accurate answers; but,
mouse, rat, small animals, herbivores population would increase.
Anything that the snake eats would increase in population.
Explanation:
Anything that eats the snake would decrease.
The reduction of the snake population due to hunting in the food web can result in an increase in the population of prey species and a disruption in the energy flow of the ecosystem.
Explain how an increase in the population of prey species can reduce snake population?Snakes are predators and they play an important role in regulating the population of their prey species, such as rodents and insects. With the reduction in the snake population, the number of prey species may increase, leading to a possible imbalance in the ecosystem.
This can lead to an increase in the population of other predators or a decrease in the population of prey species that are lower in the food web.
Disruption in energy flow: Snakes occupy an important trophic level in the food web, and their removal can disrupt the flow of energy and nutrients in the ecosystem.
This can lead to a cascading effect on other species in the food web, as their food sources and predators may be affected. For example, if the snake population declines, the population of the animals they prey on may increase, leading to overgrazing or competition for resources.
Additionally, if snakes are a food source for other predators, the decline in the snake population can affect the survival and reproduction of these predators.
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Bacteria that can live in extreme environments.
thermophiles
halophiles
methanogen
all of the above
Sickle cell anemia (SCA) is a human genetic disorder known to be caused by a recessive allele. A couple plans to marry and wants to know the probability that they will have an affected child.
In the following scenarios, use your knowledge of Mendelian inheritance to give the families the probabilities of having a child with SCA.
The man and woman do not have SCA. However, each has one parent with the disorder.
The man is affected by the disorder.
The woman has no family history of SCA.
Answer:
25% probability of the child to be affected. 0% chances to be affected.Explanation:
Due to technical problems, you will find the complete answer and explanation in the attached files
The probability of having a child having sickle cell anemia can be obtained form Mendelian genetics.
Sickle cell anemia (SCA) is a human genetic disorder that causes the red blood cells to be sickle shaped leading to the clotting of blood in the sufferers and frequent health crisis.
If one parents do not have the disorder but each has one parent that has the disorder, then it follows that each parent has the recessive allele and there is a 25% percent chance that their child could have the disorder.
If the man is affected by the disorder and the woman has no family history of the disorder, then there is a zero percent chance of having a child with the disorder.
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Which characteristic can be used to determine if an organism is living?
A- size of the organism
B- ability to breathe oxygen
C- ability to respond to environmental changes
D- ability to move at various speeds
Answer:
C
Explanation:
not all living things breathe oxygen, move, and are not all the same size, the only answer that makes sense is responding to environmental changes
In your own words, how would you describe Heredity in one sentence?
Answer: The passing on of traits and physical features from parents to children.
Explanation:
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MATCHING - CULTURING TECHNIQUES
Agar Incubator
Media (medium)
Colony Inoculation
Mixed culture
Petri dish
Pure culture
1
Culture plate used to grow microorganisms
2
Derivative of seaweed; dissolves in hot water and
solidifies in cooling; substance on which bacteria grow
Food source for bacteria
3
4.
5
Transfer of microorganism to sterile quantity of
nutrients
Thermostatically controlled chamber which maintains
media at constant optimal temperature
Microbiological habitat that possesses two or more
types of organisms
Collection of one specific type of microorganism
6
7
8
Large cluster of microorganism visible to the naked
eye
Answer:
1 is petri dish and 3 is agar
The water vascular system of echinoderms (A) functions as a circulatory system that distributes nutrients to body cells. (B) functions in locomotion and feeding. (C) is bilateral in organization, even though the adult animal is not bilaterally symmetrical. (D) moves water through the animal’s body during filter feeding. 4. Which of the following combinations of phylum and description is correct? (A) Echinodermata—radial symmetry as a larva, coelom (B) Nematoda—roundworms, internal skeleton (C) Platyhelminthes—flatworms, gastrovascular cavity, no body cavity (D) Porifera—gastrovascular cavity, coelom
Answer:
The water vascular system of echinoderms (B) functions in locomotion and feeding.
Which of the following combinations of phylum and description is correct? (C) Platyhelminthes—flatworms, gastrovascular cavity, no body cavity
Explanation:
Echinoderms are marine animals. They have a water vascular system that make them able to move (locomation), respiration and food and waste transportation. This system is full of different canal along the body.
Echinodermata has not a radial symmetry as a larva, in fact it has a bilateral symmetry and coelom present. When it comes to Nematoda, they are roundworms and have a pseudocoelomate. Finally, porifera has a gastrovascular cavity and no coelom.
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A heterozygous female with long whiskers mates with a heterozygous male with long
whiskers... W=long whiskers w=short whiskers
What is the PHENOTYPIC RATIO of the offsprings?
Answer:
3 long whiskers: 1 short whiskers
Explanation:
This question involves a single gene coding for whiskers length in a certain animal. The allele for long whiskers (W) is dominant over the allele for short whiskers (w). This means that a heterozygous individual (Ww) will possess a long whisker.
According to this question, a heterozygous female with long whiskers (Ww) mates with a heterozygous male with long whiskers (Ww). The proportion of offsprings that will be produced from this cross (see punnet square) is as follows:
WW, Ww, Ww, ww
WW, Ww, Ww offsprings will possess a long whisker while 'ww' offspring will possess a short whisker. Hence, the phenotypic ratio will be 3 long whiskers: 1 short whiskers
Order these to fastest to slowest in heating.
Rock, Water, Sand.
Answer:
Water, Sand, Rock
Explanation:
What are the pistillate and staminate
of the wild rice plant?
Answer:
The lower branches of the panicle bear only staminate (“male”) flowers, while the upper, more erect branches bear only pistillate (“female”) flowers, and of course it's these pistillate flowers from which the grains will develop
Explanation:
The process in which the cultures of the world slowly become more and more alike, merging into
one global culture is called
Answer: Acculturation.
Explanation: Acculturation is a process of social, psychological, and cultural change that stems from the balancing of two cultures while adapting to the prevailing culture of the society.
Each kidney contains more than 1 million filtering structions called nephrons. The nephron is made up of cells that work together. Based on the information, which statement is true?
A. The nephron can be defined as an organ.
B. The kidney can be defined as an organ system.
C. The nephron can be defined as in organ system.
D. The nephron can be defined as a tissue.
Answer:
letra c
Explanation:
Which of the following scientists influenced Darwin as he developed his ideas about evolution? Choose all that apply.
A. Lyell.
B.Malthus.
C.Mendel.
D. Schwann.
Choose all that apply
Lyell and Malthus influenced Darwin as he developed his ideas about evolution
Darwin believed there would have been plenty of time for evolution to occur. Darwin didn’t develop his theory completely on his own. He was influenced by the ideas of earlier thinkers.
Some of the early thinkers include Jean Baptiste Lamarck (idea of the inheritance of acquired characteristics), Charles Lyell ( Principles of Geology), Thomas Malthus (on population).
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