Answer:
1) Natural selection
2) Hypothesis: The excessive use of FQ antibiotics on chickens leads to the fixation of new genes -by natural selection- that result from mutations in the bacterial genetic material, which makes these cells become even more resistant to the drug.
Explanation:
1) Natural selection selects beneficial alleles and increases their frequency in the population.
Natural selection results in adaptation, which means the increase of the aptitude phenotype. Aptitude is the contribution of each genotype to the next generation.
In many cases adaptations, resulting from natural selection can be correlated to environmental factors or selective pressures applied by other organisms or habitat.
Let us remember that, a mutation is a change or alteration in DNI sequences that introduce new variants. Many of these are eliminated, but some of them might succeed and be incorporated into each individual. These mutations are the ones that have been selected by natural selection.
So, in the exposed chickens´ example, we are focussing on bacteria populations.
The selective pressure or modeling environmental factor is the FQ antibiotic. The bacteria´s response to antibiotics is the survival of only those that carry mutations. Natural selection benefits these mutations. Bacteria survive and become more resistant2) Hypothesis.
First, remember that the hypothesis is a conjecture. The researcher hypothesizes in order to predict what is going on or what is expected to occur. A hypothesis is a claim of how it works a relation between two or more variables. Usually, it is written in the present time.
So in this example, we want to correlate the use of antibiotics with bacteria resistance.
I would hypothezise as following,
The excessive use of FQ antibiotics on chickens leads to the fixation of new genes -by natural selection- that result from mutations in the bacterial genetic material, which makes these cells become even more resistant to the drug.
This hypothesis probably states the same as yours but turns to be more concise. The hypothesis needs to go to the point. If you want to be more specific, you can probably add some specific hypotheses to dig into your work.
We have that the,Natural selection caused the FQ antibiotic resistance.
Natural selectionGenerally , Natural resolution causes a reaction that leads to antibiotic resistance, Mutation in micro organism make them resistant to antibiotics and when they reproduce similarly ,they will pass by this resistant trait to their offspring, which will outcomes into a completely resistant generation.
In the give up ,result is a populace of in most cases resistant bacteria.
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A plant species live in an area with limited sun.Which physiology adaptation would be most useful to the plant?
Answer:
The correct answer is - large leaves.
Explanation:
Chlorophyll is the green pigment present in the chloroplast found in the plant cells that is used to make food or glucose from sunlight. These pigments are present in a high amount on the leaves of the plant.
If a plant lives in an area with limited sun then there will be a limited amount of sunlight for that plants adapt accordingly and big leaves are one of them. Big leaves have more chlorophyll and the more the pigment higher the amount of energy is trapped by the plant for food production.
The following Punnett Square is a monohybrid cross. It takes the genotypes of the parents and predicts the genotypes of their offspring. Fill in the punnett square. Each square will have 2 letters
Answer:
For the 1st block on the left I think there are 2 dominants for that would be BB. The 1st block on the right would be 1 dominant and 1 recessive and that would be Bb. The bottom on the left would be the same as the first block on the right. That would be Bb. The last block that would be the bottom right would be 2 recessives and that would be bb. I hope this might help.
Explanation:
When you are doing punnet squares, you have dominant and recessive traits. There are ways you can do that. If you have 2 alleles of each parent of that offspring, there will be a genotype and a phenotype that represents a genetic trait of each genotype. I hope this helps your question.
In system 1, glucose will move ___________ Sac 1 because of ___________.
a. out of; diffusion
b. in to; diffusion
c. out of; osmosis
d. in to; osmosis
Explanation:
The answer is c in my understanding
based on the information on the map where are the most stable ecosystems usually found?
The correct answer is C. Near the equator.
Explanation
The image shows a world map in which there is a horizontal black line in the middle that represents the equator line and some red areas. These areas are the most stable ecosystems in the world since due to their proximity to the equator the incidence of the sun's rays is more direct. Also, in these areas, there is no weather pattern defined by seasons, but climates are defined by altitude, that is, meters above sea level. Therefore, the correct answer is C. Near the equator.
Answer: c
Explanation:
I took the test :)
Osmotic pressure is: the pressure required to stop the flow of solvent from a region of high solute concentration to a region of low solute concentration. the pressure required to stop the rupture of the semipermeable membrane. the pressure required to reverse the flow of solvent through a semipermeable membrane during osmosis. the pressure required to stop the flow of solvent from a region of low solute concentration through a semipermeable membrane into a region of high solute concentration. None of these
Answer:
the pressure required to stop the flow of solvent from a region of low solute concentration through a semipermeable membrane into a region of high solute concentration.
Explanation:
Osmosis is the movement of water (solvent molecule) from a region of low solute concentration to a region of high solute concentration via a semipermeable membrane.
Osmotic pressure is the pressure (force) applied to a given solvent in order to prevent it's movement via osmosis across a semipermeable membrane. Since, osmotic pressure is the pressure required to stop osmotic process, then it can be further defined as follows:
Osmotic pressure is the pressure required to stop the flow of solvent from a region of low solute concentration through a semipermeable membrane into a region of high solute concentration.
Which of these is a difference between DNA and RNA?
DNA is found in the nucleus; RNA is never found in the nucleus.
DNA consists of five different nucleotides; RNA consists of four different nucleotides.
RNA is double-stranded; DNA is single-stranded.
DNA contains thymine; RNA contains uracil.
In DNA, adenine pairs with guanine; in RNA, adenine pairs with thymine.
Like DNA, RNA is made up of nucleotides. There are two differences that distinguish DNA from RNA: (a) RNA contains the sugar ribose, while DNA contains the slightly different sugar deoxyribose (a type of ribose that lacks one oxygen atom), and (b) RNA has the nucleobase uracil while DNA contains thymine.
what is the role of PCR in DNA typing
Answer:
Polymerase chain reaction, or PCR, is a laboratory technique used to make multiple copies of a segment of DNA. PCR is very precise and can be used to amplify, or copy, a specific DNA target from a mixture of DNA molecules.
Explanation:
You can find the correct mass of a solid by using ________
Answer:
weights
Explanation:
What is the process of mountain building called?
Answer:
Orogeny is the process of mountain building, and may be studied as a tectonic structural event, as a geographical event and a chronological event, in that orogenic events cause distinctive structural phenomena and related tectonic activity, affect certain regions of rocks and crust and happen within a time frame.
Explanation:
hope this helps if it does can i get brainlist
What did the orbiter do for 5 months once it reached the planet?
PLSZ HELP ME EITB THIS
Answer:
I don't understand the question you sent me
Why might more frequent prescribed burns be easier to control than less frequent burns?
Answer:
Wildfires that burn into areas where fuels have been reduced by prescribed burning cause less damage and are much easier to control. ... The time interval between fires can be as often as every year although a 3- or 4-year cycle is usually adequate after the initial fuel-reduction burn.
Explanation:
Hope it helps! Correct me if I am wrong!
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Answer: C
Explanation:
importance of transpirtation
Answer:
transportation is important for whole world because it is a part of water cycle
Why did the rabbit with medium size legs
survive?
Answer:
it was the fittest......
Answer:
cause it didnt have skinny legs that was twiggs ;)
What is the function of the large intestine?
A. Add bile to the food to help break it down.
B. Remove nutrients from the food with chemical processes
C. Absorb remaining material into the body
D. Remove water from the remaining undigested material
Answer:
C
Explanation:
The primary function of the large intestine is the Reabsorption of water and mineral ions such as sodium and chloride.
Height in humans is an example of
Answer:
Polygenic inheritance
Explanation:
Polygenic inheritance refers to inheritance of a phenotypic characteristics (trait) that is attributable to two or more genes and can be measured quantitatively.
Which is not a part of the digestive system?
A. Large Intestine
B. Small Intestine
C. Trachea
D. Esophagus
the right of a court to choose to do or not to do something particularly in relation to sentencing an offence is known as
Answer:
I HOPE IT WILL HELP U
Explanation:
guidelines
Which of the following statements is true according to the food web shown above?
A.
Energy flows from producers and consumers to decomposers.
B.
Energy flows from producers, consumers, and decomposers to the Sun.
C.
Energy flows from consumers to decomposers and from decomposers to consumers.
D.
Energy flows directly from the Sun to consumers.
Answer:
A.
Energy flows from producers and consumers to decomposers.
Explanation:
Answer:
A. Energy flows from producers and consumers to decomposers
All energy starts from the producers, then it continues of to the consumers which then creates waste to soon enough become the property of decomposers.
Hope this helps!
how many total autosomes do human cells have
Answer:
22
Explanation:
....hope it helps.......
Answer:
Humans have 22 pairs of autosomes ..
Explanation:
what is a good blood pressure?
Answer: A normal blood pressure level is less then 120/80mmHg
Explanation:
When does a cell have chromosomes in the dyad form?
G1 stage of interphase
telophase of mitosis
after meiosis 1
after meiosis II
in olden days,parents were regaeded as educators,and educators as parents.
Answer: That answer is completely FALSE
Explanation:
Starch is a complex carbohydrate that is digested by the enzyme amylase. A mutation in the gene that encodes amylase prevents the digestion of starch. The inability to digest starch is an autosomal recessive trait. In a population of 1000 flies, 410 were unable to break down starch. What is closest to the number of flies expected to be heterozygous for the amylase mutation assuming all conditions of Hardy-Weinberg equilibrium are met?
Answer:
The closest to the number of flies expected to be heterozygous for the amylase mutation assuming all conditions of Hardy-Weinberg equilibrium are met is 1600 flies.
Explanation:
According to the Hardy-Weinberg equation : p² + 2pq + q² = 1
Also p + q = 1
Where p² is the frequency of individual flies with the similar alleles for the dominant trait;
2pq is the frequency of individuals with the heterozygous allele for breaking down starch, while q² is the frequency of the individuals having similar allele formthenrecessive trait.
q² = 410/10000 = 0.041
q = 0.2
p = 1 - 0.2
p = 0.8 p² = 0.8²
p² = 0.64
2pq = 1 - 0.2 - 0.64 = 0.16
2pq = 0.16 × 10000
2pq = 1600
Therefore, the closest to the number of flies expected to be heterozygous for the amylase mutation assuming all conditions of Hardy-Weinberg equilibrium are met is 1600 flies.
what is the name of the hormone that promotes the production of follicles in the ovary?
A-ADH
B-FSH
C-LH
D-TSH
B-FSH he hormone responsible for starting follicle development and causing the level of estrogen to rise.
Answer:
B
Explanation:
FSH helps mature the follicles, and LH helps stop the phase of ovulation so that next step can occur
4.5.1 Practice: Evolution and Classification
Answer:
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Explanation:
Answer:
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Delte spaces
What is chrosome ? (Definition in own words )
Answer:
A structure found inside the nucleus of a cell. A chromosome is made up of proteins and DNA
Explanation:
:)
Answer:
a chromosome is a long DNA molecule with part or all of the genetic material of an organism. most eukaryotic chromosomes include packaging proteins called histones which aided by chaperone proteins bind to and condense the DNA molecule to maintain its integrity.
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What were three different biomes that Darwin visited on his voyage.
Answer:
Tropical rain forest, temperate woodlands, temperate forest.
Explanation:
Charles Darwin collected plants and animal specimens for the study of their distinct pattern of biodiversity. Darwin visited three biomes namely temperate forest, tropical rainforest, and temperate grassland.
What are biomes?
A biome is a biogeographical unit which is consist of a biological community formed in response to a shared regional climate.
Biomes may be spread over more than one continent. Biome is a term for habitat which can be comprised of a variety of habitats.
During the voyage, Darwin visited three biomes namely temperate forest, tropical rainforest, and temperate grassland for the study of biodiversity of plants and animals.
Thus, it can be concluded that temperate forests, tropical rainforest, and temperate grassland are the three different biomes that Darwin visited on his voyage.
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A consistent response in many organisms to changing environmental temperatures is the restructuring of cellular membranes.In some fish, phosphatidylethanolamine (PE) in the liver microsomal lipid membrane contains predominantly docosahexaenoic acid, 22:6 at C-2 of the glycerol-3-phosphate backbone and then either a saturated or monounsaturated fatty acyl group at C-1. Which of the following statements are False?
a. At 10 degrees Centigrade a lower percentage of PE molecules contain saturated fatty acyl groups at C-1 when compared to fish acclimatized at 30 degrees Centigrade.
b. At 10 degrees Centigrade a higher percentage of PE molecules contain saturated fatty acyl groups at C-1 when compared to fish acclimatized at 30 degrees Centigrade.
Ñ. At 30 degrees Centigrade a lower percentage of PE molecules had monounsaturated acyl groups at C-1 compared to that observed at 10 degrees Centigrade.
d. At 30 degrees Centigrade a higher percentage of PE molecules had monounsaturated acyl groups at C-1 compared to that observed at 10 degrees Centigrade.
e. The purpose of membrane restructuring with a change in temperature is to maintain fluidity of the membrane.
Answer:
The false statements are :
b. At 10 degrees Centigrade a higher percentage of PE molecules contain saturated fatty acyl groups at C-1 when compared to fish acclimatized at 30 degrees Centigrade.
d. At 30 degrees Centigrade a higher percentage of PE molecules had monounsaturated acyl groups at C-1 compared to that observed at 10 degrees Centigrade.
Explanation:
The false statements are :
b. At 10 degrees Centigrade a higher percentage of PE molecules contain saturated fatty acyl groups at C-1 when compared to fish acclimatized at 30 degrees Centigrade.
d. At 30 degrees Centigrade a higher percentage of PE molecules had monounsaturated acyl groups at C-1 compared to that observed at 10 degrees Centigrade.
Reason -
When temperature decreases, the proportion of unsaturated fatty acids increases and saturated fatty acids decreases that also decreases the fluidity of the membrane and thereby make it stiff.
When temperature increases, the proportion of unsaturated fatty acids decreases and saturated fatty acids increases that makes the cell membrane more fluidic.
So, the temperature changes restructures the membrane with respect to fluidity of membrane.
Therefore,
At 10° Celsius, at C-1 of glycerol, the proportion of unsaturated fatty acids increases and saturated fatty acids decreases.
At 30° Celsius, the proportion of unsaturated fatty acid decreases and saturated fatty acid increases.