Answer:
D. Photosynthesis.......
alfred hershey and martha chase designed an experiment to determine the chemical makeup of griffith's transforming principle. define the term bacteriophage and explain why this organism was a good choice for this particular experiment. describe the procedure of the experiment using the terms bacteriophage, DNA, and proteins in your answer. Describe the results of the experiment and connect them to hershey and chases conclusion
Answer:
Bacteriophages (phages) are viruses that infect only bacteria and do not infect mammalian or plant cells. Phages are ubiquitous in the environment. Phages or bacteriophages were chosen as a model system for their simplicity, as they only contained protein-coated nucleic acid. Alfred D. Hershey and Martha Chase (who were part of the bacteriophage group) in 1952 studying the infection of the bacterium Escherichia coli by the T2 phage show that the information definitely resides in the DNA. They used phage with either [32P] -labeled DNA or [35S] -labeled proteins to infect the bacteria. Immediately afterwards, they centrifuged the sample so that the infected bacteria remain in the pellet and the virus capsids (proteins) remain in the supernatant. [35S] is found in the supernatant, whereas [32P] is found in bacteria. After one cycle of infection, it was observed that when phage labeled in the [35S] proteins were used, only 1% of the radioactivity was incorporated into the progeny. But when phages were [32P] labeled, more than 30% of the radioactivity was in the progeny. They showed directly that what is transmitted from one progeny to another is the DNA and not the proteins, despite having first "diluted" in a bacterium.
Explanation:
Bacteriophages are viruses that infect bacteria in a specific way. Bacteriophages, like other known viruses, are found in an intermediate zone between living organisms and inert matter. Bacteriophages bind to the host pathogenic bacterium, introduce their genetic material, replicate inside it and destroy it. Hersey, along with his assistant Martha Chase, used phages because they knew that T2 phages were made up of 50% proteins and 50% nucleic acids and that phages entered bacteria and reproduced. As the progeny carried the same infection traits, the genetic material of this had to be transmitted to the offspring, but the mechanism was unknown. These scientists carried out an experimental work with the T2 virus, a bacteriophage that infects the bacterium Escherichia coli, which it reproduces by attaching itself to the outer wall of the bacterium, injecting its DNA into it where it replicates and directs the synthesis of the phage's own proteins. Phage DNA is encapsulated within proteins and produces phages, which lyse or disrupt the cell and release phage from progeny. They infected a culture of bacteria with radioactively labeled phages: the protein coat with sulfur (35S) and its DNA with phosphorus (32P). After infection, they separated the phages from the bacteria by violent shaking using a mixer (hence the name of the experiment). By centrifugation the much smaller phages remained in the supernatant and the much larger bacteria in the pellet. 85% of the radioactivity corresponding to DNA appeared in the pellet and 82% of the protein in the supernatant. This result supported the idea that DNA was the only component of the bacteriophage that penetrated the interior of the bacteria and, having the ability to form new phages, constituted the genetic material.
is such a thing possible?
Answer:
Wait- so this bear can smell me ( ಠ U ಠ )
Explanation: ●_●
Answer:
PFFFFFT ok then
Explanation:
^﹏^ ~juno
Which of these does Not occur during mitosis.
1. Separation of chromatids
2. Dissolving of the nuclear envelope
3. Division of the cytoplasm
4. Formation of chromosomes
Answer:
I'm not sure, but I think it's 4
After cytokinesis, how many cells have been formed from the parent cell?
Answer:
During cytokinesis, a single cell divides into two daughter cells.
Explanation:
Answer: Mitosis = 2 genetically identical daughter cells,
Meiosis = 4 genetically different daughter cells
Study Guide
Relationships in Ecosystems/ Human Impact
1. Which of the following is NOT correct?
A population is all the organisms of the same species that live in the same area
b. A community is all the populations of different species that live together in the
same area
A population is all the populations of different species that live together in the
seme eres
d. An ecosystem is all of the living and nonliving things in an area
C.
How much force would a shot putter need to make a 5.5 kg shot accelerate at 8 meters per so one squared
Answer:
44 N
Explanation:
Force applied can be calculated using the formula as follows;
F = m.a
Where;
F = force (Newton)
m = mass (kg)
a = acceleration (m/s²)
According to the information provided in this question, mass of shot put = 5.5kg, acceleration = 8m/s². Hence;
F = m × a
F = 5.5 × 8
F = 44 Newtons
The force needed by the shot putter is 44N.
A bird that can easily out complete other birds for its food and that can produce many eggs has high what?
Answer:
Fitness or aptitude
Explanation:
Aptitude (or fitness) is the genotype/phenotype that results in the survival, fertility, and capability of having a mate. It is a way of measuring the individual ability to leave fertile offspring.
Aptitude puts together everything that matters in natural selection. Includes the survival capability, finding a mate partner possibility, producing fertile descendants, and leaving the genes to the next generation. The aptitude of a genotype must be significant for natural selection to act in its favor.
in 2008, engineers at nasa developed the Fermi gamma ray telescope. gamma rays come from the most extreme places in the universe. NASA is studying them because scientists want to learn more about environments in the universe that make gamma rays. this includes objects such as exploding stars. the photograph below is an image taken using the Fermi gamma ray telescope. using the information above, along with your knowledge of the electromagnetic spectrum column where should the Fermi going rate telescope be placed to enable the highest quality images to be recorded by this telescope? A. orbiting in space somewhere outside earth's atmosphere. B at the top of a tall mountain away from all sources of light pollution. C any area on Earth that will allow enough room for a large satellite dish. or D. two opposite locations on earths surface are required, including the north and south pole.
Which are true about changes in carbon dioxide in the Earth's atmosphere since 1860? Select the two correct answers.
A. The increases in carbon dioxide are caused by human activity.
B. The increases in carbon dioxide can be explained by the Milankovitch cycle.
C. The rate of change in carbon dioxide is exponential.
D. The changes are triggered by a new interglacial period.
The true statements about changes in carbon dioxide in the Earth's atmosphere include:
The rate of change in carbon dioxide is exponential. The increases in carbon dioxide are caused by human activity.What is Carbon dioxide?This is a gas which is found in the atmosphere and it is what we exhale when breathing and used by plants during photosynthesis.
The changes in the gas in the Earth's atmosphere since 1860 is as a result of the factors mentioned above.
Read more about Carbon dioxide here https://brainly.com/question/1016850
Please Answer These Questions!
1. What is a stimulus?
2. Why does the body respond to stimuli?
3. What are some different types of stimuli?
4. What are sensory organs and what type of stimuli do these receptors respond to?
5. What is an explanation of how the information from stimuli is communicated to the brain?
6. What is a description of the two things that can happen when the brain processes the information from stimuli?
Hello, 3Coli Here!
Here are your answers:
1. What is a stimulus?
Stimulus is a natural body reaction caused by changes in the environment around or inside the organism. This is a response from the brain.
2. Why does the body respond to stimuli?
The body responds to stimuli, because it needs to protect itself.
3. What are some different types of stimuli?
The two main types of stimuli are external stimuli and internal stimuli. External stimuli are reactions triggered by changes that occur outside of the body, while internal stimuli are reactions triggered by changes inside of the body.
4. What are sensory organs and what type of stimuli do these receptors respond to?
The most commonly used sensory organs include Eyes, Ears, Tongue, Nose, and Skin. Eyes respond to light and motion, because they are used to see. Ears respond to sound, because they hear. The tongue is used to taste, so it senses flavors. The nose is used to smell, so it responds to scents. Finally, the skin is used to feel, so it responds to whatever it feels.
5. What is an explanation of how the information from stimuli is communicated to the brain?
Neuron receptors convert internal and external environments into electrical signals, and then is sent to the brain through nerves.
6. What is a description of the two things that can happen when the brain processes the information from stimuli?
After the brain receives the signal, it will provide a response. One type of response is that the body will physically react to the change. The second type of response is to avoid the change.
Hopefully, this helps! :D
Ask your question below!
In a food chain, energy moves from producer to herbivore or
and then on to other consumers.
Answer
energy
food web
omnivore
all of the above
Answer:
To other consumers.
Put the phases of cell division (sex cells ) in order there are 12
Answer:
Prophase I, prometaphase, metaphase I, anaphase I, telophase I, and cytokinesis, interphase, prophase II, prometaphase II, metaphase II, anaphase II, telophase II, and cytokinesis.
Explanation:
Prophase I, prometaphase, metaphase I, anaphase I, telophase I, and cytokinesis, interphase, prophase II, prometaphase II, metaphase II, anaphase II, telophase II, and cytokinesis are the 12 phases of cell division that occurs in the sex cells of human body. These double phases allow the sex cells to produce four daughter cells from a single parent cell but the chromosomes number is half in each daughter cell.
what is osmosis? Explain in detail with examples?
movement of water molecules from a dilute solution to a concentrated solution
Explanation:
I put a process by which molecules of solventtend to pass through through a semi permeable membrane from a less concentrated into more concentrated one
example :feeling thirsty after having salty food
29. A teacher presented the two models below to the dass. The models represent a eukaryote and prokaryote cell. The teacher asked the students to label the structure of each cell that contains the genetic code and
tell where it is located.
structure C, located in the cytoplasm in Cell A and structure C, located in the cytoplasm in Cell B
structure H, located in the cytoplasm in Cell A and structure A, located in the nucleus in Cell B
structure C, located in the nucleus in Cell A and structure C, located in the cytoplasm in Cell B
structure H, located in the cytoplasm in Cell A and structure A, located in the cytoplasm in Cell B
Answer:
C. structure C, located in the nucleus in Cell A and structure C, located in the cytoplasm in Cell B
Explanation:
This question contains images that depicts an eukaryotic cell (animal) and a prokaryotic cell (bacteria). According to the question, a teacher asked the students to label the structure of each cell that contains the genetic code (DNA) and tell where it is located.
In an eukaryotic cell, the genetic material (DNA) which contains the genetic code is located inside a well defined membranous structure called NUCLEUS while the genetic material in a prokaryotic cell is found naked in a region of the cytoplasm called NUCLEOID as they lack a membrane-bound nucleus. Based on this explanation;
- Structure C is the genetic material (DNA) which contains the genetic code of cell A (eukaryotic cell), hence, the genetic code of cell A is found in structure C, which in turn is located in the centrally-placed NUCLEUS.
- Structure C is the genetic material containing the genetic code of cell B (prokaryotic cell), hence, the genetic code of cell B is found in structure C, which in turn is located in the CYTOPLASM.
What's cycle works together with the carbon cycle
Answer: The carbon cycle is nature's way of reusing carbon atoms, which travel from the atmosphere into organisms in the Earth and then back into the atmosphere over and over again. Most carbon is stored in rocks and sediments, while the rest is stored in the ocean, atmosphere, and living organisms
Explanation:
A pine tree is a conifer. What type of plant is a conifer?
an
angiosperm
a gymnosperm
Answer: A subset of Gymnosperms
Explanation: They are cone-bearing seed plants
explain reproduction in hydra
Answer:
Budding
Explanation:
The common asexual method of reproduction by hydras is budding. Buds originate at the junction of the stalk and gastric regions. The bud begins as a hemispherical outpouching that eventually elongates, becomes cylindrical, and develops tentacles. The bud then pinches off and a new individual becomes independent. Buds are produced every two to three days under favorable conditions. Following unfavorable conditions, such as injuries or periods of scarce resources, hydras occasionally reproduce through transverse and longitudinal fission.
What reacts with sulfur dioxide in
the atmosphere to form acids that
return to the surface as either dry
or wet deposition?
Answer:
Acid rain is caused by emissions of sulphur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.
What effect does burning fossil fuels during manufacturing and energy production have on outdoor air pollution?
Answer:
It causes global warming as well as air pollution.
Explanation:
Burning of fossil fuels has adverse effect on outdoor air pollution because when the fossil fuels burns carbondioxide gas is released in the atmosphere. Carbondioxide gas is a greenhouse gas which is released in the atmosphere through burning of fossil fuels and is responsible for increasing air pollution. This increase in carbondioxide gas leads to global warming due to blockage of solar radiation that is reflected from the earth surface.
How can humans best limit the negative impact that farming has on soil quality?
Answer:
rasenshuriken jk f these resources, soil and water have provided humans with the ability to ... to fertile soils; 3) the impacts of intensive agriculture on soil degradation; and 4) the ... in a severe limitation of crop yield — an example of the principle of limiting factors. ... to generate new soil, it is imperative that agricultural practices utilize best ...
Explanation:
Give an example or describe how WATER QUALITY can be impacted by the Water Cycle in an Aquatic Environment
Answer:
the water cycle can cause some waters that come from a polluted source to be cycled into aquatic enviroment lowering life quality for the inhabitants. at least i think so
Explanation:
_____ is a force caused by air that slows objects down
Answer:
Drag
Explanation:
Drag is a force caused by air that slows objects down
Friction is a major force that slows the object down, air resistance is a type of frictional force.
What is air resistance?Air resistance is a kind of frictional force that slows down an object from moving in a particular direction.
During the movement an object has a particular speed for movement, speed depends on how friction works, more friction slows the speed of an object a low friction allows the object to at a particular speed.
Air is a mixture of gases and particles in the atmosphere, these particles create a force during the movement of an object in the air, and these forces decide the actual speed of object movement.
Therefore air resistance is a force that slows the object.
Learn more about air resistance, here:
https://brainly.com/question/19165683
#SPJ2
the chief purpose of the photosynthetic process is considered to be the
What is the chemical symbol of Hydrogen?
Answer:
the symbol for hydrogen is H
If today is Monday and it is a 1st quarter moon, what phase will it be on Thursday
Answer:
Saturday
Explanation:
because
Do you think a solar furnace could work well where you live?
i thank we could use one
Explanation:because we don't really have cold weather in okc
hope it helps ☺
One day you experience violent thunderstorms followed by a few days of colder weather. Which type of front most likely moved through your area? occluded front stationary front warm front cold front
Answer:
d
Explanation:
The whether occurrence as described in the question is caused by the cold front.
What is a front?In discussing about weather, a front refers to a region in which there is a transition between air masses on the earths surface. The occurrence of various types of front is the reason behind different types of whether patterns.
The violent thunderstorms followed by a few days of colder weather is caused by a cold front.
Learn more about whether fronts: https://brainly.com/question/16357973?
what are the two biggest planets on earth
Answer:
️ ️
Explanation:
why is intensive system the most EXPENSIVE system
Answer:
The intensive farming looks at increasing the yield in the given limited land space with a high dependency on fertilizers, labor, and machinery. ... But as extensive farming is remotely located, the labor cost, the production cost is higher. Also, the output calls for much more care and takes a while to yield the crops.
Explanation:
PLS HELP!!
In a normal distribution, the number of organisms exhibiting a phenotype variant near the lowest value is(1 point)
-greater than the number exhibiting a variant near the highest value.
-greater than the number exhibiting a variant near the middle value.
-less than the number exhibiting a variant near the middle value.
-less than the number exhibiting a variant near the highest value.
Kamar is looking for his birth mother. Kamar knows that his blood type is AB and his father’s blood type is heterozygous A. What can Kamar assume about his mother’s blood type?(1 point)
-Kamar’s mother must be either AB or B because blood types AB is considered codominant.
-Kamar’s mother must be AB because blood type AB is inherited from one parent.
-Kamar’s mother must be O because the recessive allele allows for Kamar to get type A from his father.
-Kamar’s mother must be either A or O because blood type AB is considered incomplete dominant.
A statistician collects height data in inches for a school district. Which sample is most likely to produce a normal distribution?(1 point)
-Grade 10-12
Height Range 55 - 60 60 - 65 65 - 70 70 - 75
Frequency 4 9 8 4
-Grades 1-3
Height Range 30 - 35 35 - 40 40 - 45 45 - 50
Frequency 4 1 10 10
-Grades 7-9
Height Range 50 - 55 55 - 60 60 - 65 65 - 70
Frequency 11 5 6 3
-Grade 4-6
Height Range 45 - 50 50 - 55 55 - 60 60 - 65
Frequency 12 8 4 1
The different variants of a trait available to a gene are called(1 point)
-alleles.
-genotypes.
-polygenic traits.
-phenotypes.
A wolf populations’ undercoat thickness follows a normal distribution. Suppose climate change causes the winters to grow colder. Over many generations, the distribution of undercoat thickness in this population will likely(1 point)
-shift toward a thinner coat.
-shift toward a thicker coat.
-remain the same.
-no longer be normal.
HELPPPP PLEASE....
:)
1 is a: less than...middle value
2 is c: ab or b
3 is d: grade 10-12
4 is a: alleles
5 is a: ..... thicker coat
Explanation: just took this, these are the correct answers for MY quick check. could very well be different for yours. hope this helps though :)
The wolves undercoat will grow towards been thicker in order to protect the wolves from extreme cold conditions posed by the winter and this phenomena is called adaptation.
Blood types of offspring's are determined by the blood groups of both parents therefore if Kamara has a blood type AB his mother will mostly likely have either AB or B blood type.
Alleles are the different variants of a gene in living organisms but they are located at the same position on the chromosome.
Hence we can conclude that answers to the questions are as listed above.
Learn more : https://brainly.com/question/12541569