Answers
Answer:
See explanations below.
Explanation:
growth of seed into seedling
- chemical (bio-chemical) change. The seed will never be there in its form again, the properties of the growth are different from the seed.
wax melting
- physical change. When heat is withdrawn, it reverts to the same solid wax, with only different physical properties (such as shape or texture).
making caramel
- chemical change. it is almost like burning part of the sugar content. The browning cannot be changed back to white sugar, smells and tastes different. However, on part of the sugar has undergone chemical change.
Tarnishing of silver
- chemical change. The brown substance is silver sulphide due to reaction of silver with sulphur dioxide present in minute quantities in the air. The silver can be made to shine again by REMOVING the silver sulphide, not by reversing the change.
grinding wheat to make flour.
- physical change. The compound is still flour that contains mainly starch. The chemical properties are the same as wheat, in providing nutrients, etc.
Adding copper and gold to make jewelry.
- physical change. The two metals together make an allow, which is basically a mixture. Both physical and chemical properties of the individual metals remain.
Related Questions
A student notices that there are situations in which her avocados go bad very quickly. She decides to test the effect of temperature on how fast the avocado ripens. She purchases 3 mini avocados and 3 regular sized avocados. She places 2 mini avocados in the refrigerator and 2 regular sized avocados on the windowsill. She then placed the last mini avocado and regular sized avocado in a paper bag under the sink. Is this a controlled experiment? Why or why not?
Answers
Answer:
The last mini avocado and regular sized avocado in a paper bag under the sink is this a controlled experiment.
Explanation:
The last mini avocado and regular sized avocado in a paper bag under the sink is this a controlled experiment because it contains both the mini avocado and regular sized avocado in a paper bag under the sink, which is believed to have high temperature.
So to indeed know whether temperature has effect on the avocado, the control experiment is the mini and regular sized avocado in the paper bag under the sink.
Hope it helps.
Rarely, the conjugation of Hfr and F− cells produces two Hfr cells. Explain how this event takes place.
Answers
Answer:
"F" on account of E.coli show the fertility factor. Cells possessing this factor (called donors) hold the ability to move the hereditary material over the strains by a procedure called conjugation. F-factor exists as a free element (cell is called episome) or integrated into bacterial chromosome (cell is called Hfr-High frequency recombinant). Cells with no F factor are recipients.
In a Conjugation between a F+ and F-cell just F factor from F+ cell gets moved o produce two F+ cells. But during a Hfr and F-conjugation as the F factor is incorporated into the chromosome and by the intrinsic idea of F factor to get moved the Hfr cells attempt to move their whole genetic material across and there are two outcomes wherein one case there is a fragmented exchange of hereditary material and the recipient cell remain F-and when there is a finished exchange of hereditary material the cell becomes Hfr yet this is uncommon as the time taken for the total exchange of hereditary material is excessively long for the cells to remain contact.
How does the top level of an energy pyramid compare to the bottom level of that energy:
O it contains the greatest amount of the total energy.
ols contains the same amount of the total energy.
Our shows a reversal of the Row of energy.
O It contains the least amount of the total energ
Answers
Answer:
It contains the least amount of energy.
Explanation:
As compared to the bottom level, the energy of the top level is less in amount. Here is given an energy pyramid, in which the top level has the lowest energy and the bottom level has the most energy.
Answer:
R
Explanation:
What type of mutation occurred in the following? Normal allele GGAAUGAAACAGGAACCC Mutant allele GGAAUGAAAUCAGGAACCC
Answers
Answer:
Insertion
Explanation:
Mutation is a sudden change that occurs in the genome of an organism that is heritable i.e it can be transfer from parent to offspring. There are different types of mutation Missense, nonsense, Insertion.
Insertion is a type of mutation that involves addition of extra Nitrogenous base that was not originally in the DNA strand. This will increase the number of the DNA strand and may also affect the function of protein to be formed
The mutant strand contains Uracil(U) which was not in the normal DNA strand which indicates insertion type of mutation.
GGAAUGAAACAGGAACCC -Normal
GGAAUGAAA U CAGGAACCC- Mutant
Which type of neuron is completely contained within the CNS?
Answers
Answer:
Interneuron
Explanation:
Interneuron is association neuron or connector neuron. Which is completely contained within CNS. Usually conveys messages between parts of the system. Dendrites, axons, may be long or short.
I hope this helped. I am sorry if you get this wrong.
22. What are the properties of an efficient gas exchange system, assuming it has a good blood supply?
Answers
Answer:
There's good oxygen supply and good carbon dioxide eradicator.
Explanation:
Hope it helps.
after visiting a wastewater treatment plant, Shelly has a few questions. Which question can be answered through scientific investigation?
a:how much Wastewater is treated per day in the wastewater treatment plant?
b:are employees at the wastewater treatment plant satisfied with their jobs?
c: are the investors unhappy with the revenue generated by the wastewater treatment plant?
d:what should be the role of the government in promoting the wastewater treatment plant?
Answers
Answer:
how much wastewater is treated per day in the wastewater treatment plant?
Answer:
How much wastewater is treated per day in the wastewater treatment plant?
A compound synthesized by bacteria or fungi that destroys or inhibits the growth of other microbes is a/an:__________.
a. synthetic drug
b. antibiotic
c. antimicrobial drug
d. competitive inhibitor
Answers
Answer:
antimicrobial drugs
Explanation:
An antimicrobial is a substance that kills or inhibits the growth of microorganisms such as bacteria, fungi, or protozoans.
Answer:
[tex]\boxed{Option C}[/tex]
Explanation:
A compound synthesized by bacteria or fungi that destroys or inhibits the growth of other microbes is an anti-microbial drug. Anti means "against" so anti microbes mean against microbes. Antimicrobial drugs are synthesized by bacteria and fungi and are used against microbes.
How would the coils in the middle of the diagram change
to show a longitudinal wave with higher energy?
They would be farther apart.
They would be closer together.
O They would be shaped like a hill.
O They would be shaped like a valley.
Answers
Answer:
They would be shaped like a hill.
Explanation:
A longitudinal wave with higher energy have greater amplitude. Amplitude is the distance between the crust and trough of the wave. Crust is the upper part of the wave while trough is the lower part of the wave. If the distance between crust and trough of the wave is higher so the amplitude is also greater and we can say that the wave contains high amount of energy and vice versa. The shape of the wave just like a hill.
Individuals who have chronic bronchitis most often have:________.
A. a productive cough.
B. normal lung sounds.
C. a barrel chest.
D. substantial weight loss.
Answers
the correct answer is A.
Individuals who have chronic bronchitis most often have a productive cough. The correct option is A.
What is bronchitis?Bronchitis is an inflammation of the lungs' primary airways (bronchi), which causes them to become irritated and inflamed. On either side of your windpipe, the main airways branch off (trachea).
They have a consistent cough and lead to smaller and smaller airways inside your lungs called bronchioles.
Thus, the correct option is A.
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Retroviruses have extraordinarily high rates of evolution of all viruses because (SELECT ALL THAT APPLY):
Answers
Answer: Here are the options.
. They are single-stranded.
2. Their reverse transciptase has no proofreading capability
3. Their genetic material is RNA.
4. They disrupt the immune response.
The correct answer is because Their reverse transcriptase has no proof reading capability.
Explanation:
Retrovirus is a type of RNA that replicate it's copy and put it in the host cell DNA, there by changing it's genome. Retrovirus mutate at high rate in vivo viral replication. And this mutation in retroviruses may occur at different stages like during proviral transcription by RNA polymerase II, during minus-strand DNA synthesis (RNA template) by viral reverse transcriptase, or during plus-strand DNA synthesis (DNA template) by reverse transcriptase.
Retrovirus exhibit a high mutation rate. Polymerization errors during DNA synthesis by reverse transcriptase, has no proof reading capability, is a major method for generating genetic variation within retroviral populations.
Which scenario describes allopatric speciation?
A) A population of squirrels is separated by the Grand Canyon. The two
subpopulations evolve into two distinct species.
B) A tetraploid plant species evolves from a diploid ancestor. Both the tetraploid
and diploid species are found in the same habitat.
C) One population breeds in the fall; another population breeds in the spring.
D) A male horse and a female donkey mate, producing a sterile hinny.
Answers
Answer:
A) A population of squirrels is separated by the Grand Canyon. The two subpopulations evolve into two distinct species.
Explanation:
Answer:
Ok
Explanation:
A) because it's true
The chemicals that are released from the hypothalamus, the gonads, and the adrenal cortex are called ________, whereas the chemicals released by bioelectrical impulses throughout the brain are called ________. 1. synapses; hormones 2. neurotransmitters; synapses 3. inhibitory communicators; dendrites 4. hormones; neurotransmitters
Answers
Answer:
Option 4: hormones; neurotransmitters.
Explanation:
Hormones are the body's chemical messengers that are released from the hypothalamus, the gonads, and the adrenal cortex. They are released into the bloodstream where they are transported to target organs and tissue.
Neurotransmitters are chemicals released by neuron which stimulates other neurons, muscle cells and gonad cells allowing for the passage of impulse from one cell to another one.
The biceps femoris muscle's name gives us information about it. What does the word "femoris" in its name tell us? A. Its general location B. Its action C. Its overall shape D. The number of attachments it has E. Its general size (compared to other muscles) F. The direction of its muscle fibers
Answers
Answer:
the answer is D
Explanation:
The prefix bi indicates that the muscle has two origins
The biceps femoris muscle of the leg derives its name from having two heads of origin, long and short
What is social structure? What are some of the factors that influence social structure, please
explain them?
recome
Answers
Answer:
what is social structure?
social structure is the patterned social arrangements in society that are both emergent from and determinant of the actions of individuals.
Explanation:
What are some of the factors that influence social structure
1 distribution of recources
-leaves (abundant and dense)- support large groups of animals
2 fruits and nuts-occur in clumps-most efficiently exploited by smaller groups of animals
-some tend to be protective of resources, especially if their feeding area is small enough to be defended
3 insects (widely scattered) alone or company of 1 and 2
4 seasonal foods-smaller feeding groups-seasonality of water availability
hope this can help you....
the number of possible genetically different gametes for an organism equals 2n where n is the number of pairs of chromosomes if an organism has six pairs of chromosomes how many different gametes ca it produce
A. 64
B. 256
C. 32
D. 128
Answers
the formula is 2^n
2^6 =64
Answer:
64
Explanation:
1. Imagine that you are a horticulturist working in a commercial greenhouse. Based on what you learned from this lab, how would you manipulate these factors in order to maximize photosynthesis? Water availability Light intensity Carbon dioxide concentration Plant population density
Answers
Answer:
Explanation:
Greenhouse is experiment is an experiment under a controlled environment where the environment can be varied according to the desire of the scientist.
For photosynthesis efficiency, Water availability Light intensity Carbon dioxide concentration Plant population density can be manipulated.
Optimum water supply needed for photosynthesis will be added, plant will be expose to adequate Carbondioxide that will be enough to bring about efficiency, the light intensity will be controlled to fits the requirement and reduced when necessary and plant population will be reduced to the number of plant the available resources can carry to bring about efficiency.
Why is the word "translation" used for protein production? Protein production is the process of:________.
Answers
Answer:
Answered below
Explanation:
Translation is the actual process of protein synthesis and it occurs in the cytoplasmic ribosomes. Protein production or protein synthesis is the process in which cells make proteins. This process occurs in two stages called transcription and translation.
Transcription involves the transfer of genetic information in the deoxyribonucleic acid to the messenger ribonucleic acid in the nucleus through the process of initiation, elongation and termination. The messenger ribonucleic acid is processed and carries the information to a ribosome in the cytoplasm where protein production takes place through translation.
During translation, the instructions in the messenger ribonucleic acid are read and transfer ribonucleic acids ensure the correct sequencing of amino acids in the ribosomes. The rRNA is involved in the bonding of the base pairs to produce a polypeptide chain which is a unit of a finished protein.
Answer:
The word translation is use for protein production because it is the process of translating RNA sequence of bases.and thereby producing sequence of encoded amino acids from the RNA
sequence which is a consist of polypeptide chain during protein synthesis.
Protein production is the process of synthesising protein.
Explanation:
Translation is a process that occur in the RIBOSOMES or endoplasmic recticulum after transcription of RNA and it is the process where genetic code in the messenger RNA is decided or translated to a sequence of amino acid.
Protein synthesis is processs by which cells produce protein which occur in the RIBOSOMES.
Protein synthesis occurs in two stages which are Transcription and translation.
Transcription is the process whereby genetic instructions or materials in DNA are transmitted to messenger RNA in the nucleus.
It involves initiation, enlongation and termination.
Translation is a process that occur in the RIBOSOMES or endoplasmic recticulum after transcription of RNA and it is the process where genetic code in the messenger RNA is decided or translated to a sequence of amino acid.
Protein synthesis is process by which cells produce protein which occur in the RIBOSOMES.
Which type of bond forms disaccharides?
Answers
Answer:
Glycosidic Bond
Explanation:
Glycosidic bond is used to form disaccharides. When two monosaccharides joins together, a glycosidic bond is formed resulting in a disaccharide.
Answer:
glycosidic bond
Explanation:
Disaccharides are formed when two monosaccharides join together by the dehydration synthesis reaction resulting in a glycosidic bond between the two monosaccharide molecules. The reaction produces water as a side product.
Which of the following changes to waterways is only the result of human activity?
a.
erosion
b.
temperature fluctuations
c.
flooding
d.
chemical pollution
Please select the best answer from the choices provided
A
B
C
D
Answers
Answer:
D.Chemical pollution
Explanation:
Because erosion,flooding and temperature fluctuations is natural disaster and chemical pollution is made by human activity (i hope this help) ☺️
Answer: d edge 2021
Explanation:
The short-term controls of blood pressure, mediated by the nervous system and bloodborne chemicals, primarily operate via all but which of the following?
a. reflex arc associated with vasomotor fibers
b. reflex arcs involving baroreceptors
c. altering blood volume
d. centers in the medulla oblongata and the pons
Answers
Answer:
c. altering blood volume
Explanation:
The sympathetic nervous system acts to modulate blood pressure during short-term periods by modifying arterial pressure. The catecholamine hormone levels may be associated with an increase in the blood pressure by narrowing the blood vessels. Catecholamines are hormonal neurotransmitters released by the adrenal glands. These hormones derive from the metabolism of tyrosine amino acids and include, among others, adrenaline, noradrenaline and dopamine.
Match the foods with their functions in the living organisms they come from.
1. tuna
2. milk
3. potato
4 . lettuce
5. black bean
6. egg
A. leaf from a plant; site of photosynthesis
B. a seed containing the embryo and food reserve
C.a high nutrient liquid produced by mammals
D.energy storage for plant
E. an energy supply for a growing embryo
F.the skeletal muscle used for voluntary movements
Answers
Answers:
1 - F
2 - C
3 - D
4 - A
5 - B
6 - E
Explanation:
tuna - the skeletal muscle used for voluntary movements.
milk - a high nutrient liquid produced by mammals.
potato - energy storage for plant.
lettuce - leaf from a plant; site of photosynthesis.
black bean - a seed containing the embryo and food reserve.
egg - an energy supply for a growing embryo.
Ms. Sloan is a 27-year-old who is complaining of fatigue, shortness of breath, stomach pain, and overall weakness. She is diagnosed with iron deficiency anemia. What could you tell her about this condition? What specific nutritional needs does she have, based on her diagnosis, gender, and age?
Answers
Answer:
anemia that is caused by a deficiency of iron and characterized by hypochromic microcytic red blood cells. Vitamin D
Explanation:
Molecules that are too large to pass through the pores of a cell membrane may enter the cell by a process known as
Answers
Answer: Facilitated Diffusion
Explanation:
Facilitated Diffusion is a process for molecules that cannot be readily diffused through cell membranes. Such molecules may be too large to pass through the pores in the membrane.
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A farmer plants Bt cotton that is genetically modified to produce its own insecticide. Of the cotton bollworms feeding on these Bt plants, only 8% survive unless they have at least one copy of the dominant resistance allele R that confers resistance to the Bt insecticide. When the farmer first plants Bt cotton, the frequency of the R allele in the cotton bollworm population is 0.4. What will the frequency of the resistance allele be after one generation of cotton bollworms fed on Bt cotton
Answers
Answer:
0.6
Explanation:
According to hardy-weinberg principle,
P2+2pq+q2=1
P+q=1
q=1-p
Given that Allele R frequency is 0.4
and p represent the dominant allele
P=0.4
P2=0.4^2 = 0.16 for genotypic frequency
Since p+q=1
q=1-p
where q stands for recessive allele r frequency and q2 stands for genotypic frequency for allele r
q= 1-0.4= 0.6
q2=0.6 ^2
q2=0.36
Hardy-Weinberg principle states that are used to calculate the genetic variation of a population at equilibrium.
The frequency of the resistance allele in the cotton bollworm is 0.6.
Hardy-Weinberg equation can be given as:
P² + 2PQ + Q² = 1
where,
P = dominant allele (R)
Q = recessive allele (r)
Frequency of R allele = 0.4
From the equation:
P + Q = 1
or,
Q = P - 1
Genetic frequency of the R allele = P² = 0.4 x 0.4 = 0.16
Substituting the values:
Q = 1 - 0.4
Q = 0.6
Q² = 0.36
Thus, the frequency of the resistance allele will be 0.6.
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Match each image with the life function the organism is performing.
Answers
When glycogen phosphorylase is phosphorylated Group of answer choices its activity decreases. its activity increases. its activity is unaffected. none of these because that enzyme doesn't get phosphorylated.
Answers
Answer:
The correct answer is that its activity increases.
Explanation:
Glycogen phosphorylase comes under the category of phosphorylase enzymes. The mentioned enzyme catalyzes the rate-limiting step in the process of glycogenolysis within the animals. The sequential phosphorolysis of glycogen to discharge glucose-1-phosphate is catalyzed by the enzyme glycogen phosphorylase. Therefore, glycogen phosphorylase plays an essential part in the use of liver and muscle reserves of glycogen. After undergoing phosphorylation, the activity of the enzyme increases.
what is ecological footprint
Answers
Explanation:
Ecological footprint:
Is a Measure the area required by an individual, population or activity of biologically produced land and water to produce all the resources it consumes and absorb the waste it generates, using prevailing technology and resource management practices. Hope this helps and have a great day! Good luckWhat is radioactive dating?
A. A method of determining the age of a fosall based on the amount
of certain isotopes that remain in a fossil or rock
B. A method of determining the age of a fossil that estimates the age
of the organism at its death
C. A method of determining the age of a fossil based on a
comparison to the age of other similar fossil
D. A method of determining the age of a fossil that estimates how
closely related various fossilized organisms were
Answers
Answer:
A
Explanation:
Radioactive dating uses carbon isotopes to determine the age of a material.
Radioactive dating is a method of determining the age of a fossil, based on the amount of certain isotopes that remain in a fossil or rock. Thus, the correct option is A.
What is Radioactive dating?Radioactive dating may be defined as a methodology for estimating the approximate age of rocks and minerals by the utilization of radioactive isotopes.
This method of radioactive dating is primarily used in igneous and metamorphic rocks, which cannot be dated by the method of stratigraphic correlation that is used for determining the age of sedimentary rocks.
Therefore, the correct option for this question is A.
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Genetic factors determine how susceptible a person is to developing obesity, but __________ factors such as a consistently healthy lifestyle and a healthy diet can play a significant role as well.
a. modulation
b. genomic
c. epigenetic
d. endogenous
Answers
Hi there! Hopefully this helps!
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The answer is: A, Modulation.
The non-genetic factors such as eating habits or physical activity which lead to a healthy lifestyle and diet, greatly modulate the particular risk for developing obesity. These modulation factors are thought to possibly interact with the genetic predisposition for obesity through epigenetic mechanisms.