Sophomore Biochemistry

Biology agrees with the predecessor answer, for this chemistry problem, the answer: The meaning of this reaction formula is that m a and n b react to produce p c and q dIf m n is not equal to p q, and only ab is placed in a container, the state parameters of the container will definitely change, but the state of the container will not change when the equilibrium is reached or if the four are directly placed in a certain proportion.

The reversible reaction can be in equilibrium because the positive reaction is carried out at the same time as the reverse reaction is carried out from right to left according to the corresponding coefficient, and all state changes are canceled out by the effects of the positive and negative reactions, so the number of the four molecules does not change for a period of time, and the macroscopic performance is that the temperature pressure volume remains unchanged.

Biology, 1 choose c

Fault causes: A bacteria have no forming nucleus, B bacteria have no other organelles except ribosomes, and naturally have no mitochondria, D is the same as B, bacteria do not have endoplasmic reticulum Golgi apparatus.

2, B metaphase, when the chromosomes are arranged on the equatorial plate, are the easiest to observe.

I didn't understand the chemistry questions, but reaching that state is chemical equilibrium...

The meaning of this reaction formula is that m a and n b react to produce p c and q dIf m n is not equal to p q, and only ab is placed in a container, the state parameters of the container will definitely change, but the state of the container will not change when the equilibrium is reached or if the four are directly placed in a certain proportion. The reversible reaction can be in equilibrium because the positive reaction is carried out at the same time as the reverse reaction is carried out from right to left according to the corresponding coefficient, and all state changes are canceled out by the effects of the positive and negative reactions, so the number of the four molecules does not change for a period of time, and the macroscopic performance is that the temperature pressure volume remains unchanged.

1) Parental file: purple AABB green AABB, as can be seen from the question, the color is controlled by two pairs of alleles, and these two pairs of alleles can be freely combined (because they are not on the same chromosome), which is in line with Mendel's law of free combination, and the result should be 9:3 according to the law

3:1, but the result is that there is an F2 generation that knows purple: green = 15:

1, so it is speculated that as long as there is a dominant gene in the organism, purple will appear, so green can only be AABB, and the genotype of parental purple should be purple according to the results of the FI generation, indicating that purple is a homozygous.

2) The genotype of the purple plant may be AAB or AABB, and the kernel limb is the same as the first question, but because the F2 generation conforms to the 3:1 rule, it means that the purple is either AABB or ABB self-inbred in the F1 generation.

The last empty is simple, purple in F1 is either AAB or AABB, so the result is purple:green = 1:1

In the 1 parental combination, F1 exhibits purple-green F2 generation purple-green: green=15:1, that is, double display Yumin or single display control purple-green tells that the full implicit control green i.e., the genotype in 1 is AABB AABB In F2, AABB accounts for 1 16 AABB accounts for 2 16 AABB1 16 AABB2 16 AABB2 16 AABB 4 16 AABB1 16 AABB 2 16 takes the molecule and calculates it as a pure sum, i.e., 3 16

From the second group of F2 3:1, it can be judged that F2 is AABB AABB has known F1 offspring ABB and AABB hybridization Theoretical purple-green : purple-green = 1:1

This kind of problem needs practice to make perfect Parent: Zhenyouzhi purple aabb green aabb, from the question, it can be seen that the color is controlled by two pairs of alleles, and these two pairs of alleles can be freely combined (because they are not on the same chromosome), which is in line with Mendel's law of free combination

If there is a carboxyl group, there are two oxygens (-cooh), and if there is a peptide bond, there is an oxygen atom (-co-nh-).

If there is an amino group or a peptide bond, there is a nitrogen atom (-co-nh-), and there are several amino carboxyl groups in several peptide chains, because dehydration and condensation will destroy them.

Number of peptide bonds = number of amino acids - number of peptide chains.

So, the number of oxygen atoms = n + m the number of nitrogen atoms = n

Each amino acid contains an amino group and a carboxyl group, the amino group has one nitrogen group and the carboxyl group has two oxygen. Therefore, when n amino acids are not condensed, there are at least n nitrogen and 2n oxygen.

However, if N amino acids of Huiqi want to form m peptide chains, n-m peptide bonds will be formed at this time. Each peptide bond is formed to shrink a water molecule, and each water molecule contains one oxygen, so there are a total of 2n-(n-m) oxygen (i.e., n+m oxygen) in this m peptide chain

Peptide bonds are formed without shrinking nitrogen atoms. Therefore, the number of nitrogen atoms does not change.

The final result, there are at least n+m oxygen atoms. Nitrogen atoms are n.

FYI.

Term d is wrong because genetic recombination does not affect gene frequencies.

Natural selection, mutations, and small populations can all affect changes in gene frequencies.

Here's why: See the encyclopedia entry: Hardy-Weinberg's law of equilibrium):

The Law of Genetic Equilibrium In an ideal state, the frequencies of the alleles and the genotype frequencies of the alleles are stable and constant in heredity, that is, the genetic balance is maintained. There are five conditions that must be met for this ideal state: the population is large enough; Individuals in a population can mate randomly; No mutations occurred; No new genes have been added; There is no natural selection.

Ask the teacher, kid.

The population is small··· Does not cause a change in gene frequency... So I guess it's D...

It seems that genetic mutations are not part of the law of free combination, right? The first half of the sentence and the second half of the sentence of b are related, the population in d is too small, which may lead to the extinction of the population in its existence, and the gene frequency will become 0

The law of free combination can only explain genetic recombination, not genetic mutation.

And only genetic mutations provide the raw materials for evolution and have nothing to do with genetic recombination.

I have never heard the saying that the population is too small, but the first three are true.

Regulatory mechanisms of homeostasis: neuro-humoral - immunomodulation.

These four systems are obviously insufficient, and in mediation, the [nervous system] can be said to be the most important, which ensures the coordination and accuracy of activities between the systems. In addition, the hypothalamus belongs to the nervous system.

In addition, there is at least a lack of [endocrine system, immune system].

b The product of genetic engineering is protein, and very few are up to and other substances, which can not be considered at the high school stage. Even if the product is used as a medicine, it cannot be genetized**. Gene burial refers to the introduction of exogenous normal genes into target cells to correct the lack of ants or to compensate for diseases caused by gene defects and abnormalities, so as to achieve the purpose of starvation.

Product-agnostic.

Moreover, genetic disease is the use of genetic engineering technology to introduce normal genes into the patient's cells to correct the defects of disease-causing genes. The route of correction can be either to repair the defective gene in situ or to transfer a functionally normal gene into a part of the cell's genome to replace the defective gene to function. Yes, you can**.

This is consulted from university textbooks. It should be fine.

Answer: Select A, B. Analysis: .

Gene ** is to introduce healthy foreign genes into cells with gene defects to achieve the purpose of ** disease. A gene** can be used to obtain human genetic diseases**. This kind of saying is still early, and there are still many technical problems to be solved.

B wrong genetic engineering products refer to the use of genetic engineering methods to produce biological products, such as: insulin, interleukin, etc., it is not genetic**. Items C and D can introduce healthy exogenous genes into the fine field dust cells with genetic defects to achieve the purpose of ** disease.

b is false, it should be: gene** is a method of genetically engineering ** human disease.

If you go to "gene", you will understand.

b is incorrect.

Because it's not using genetically engineered products....

In my experience, in this kind of ambiguous answer, you should choose the option that is obviously wrong, and this is the method of this multiple-choice question, and do not dwell on some options that are not too rigorous

Hope it can help you

b, the gene ** is for the lesion gene**, and the genetic engineering products, such as pancreatin, are the genetic engineering products of Zhidan shirt, which can **diabetes, but not the gene ** is sold late.

Genes depend on whether the genes can be inherited, and those that can be inherited are inherited, otherwise they will only be cured by themselves, and the disease will still be passed on to the next generation.

c.The process of CO2 generation in the mitochondrial matrix.

Layer. Anaerobic respiration is done in the matrix of the cytoplasm.

CO2 enters the chloroplast and passes through two membranes (chloroplasts are double membranes), which have four layers of phospholipid molecules.

Choice C, because auxin transport is backlit and gravity-oriented, so the concentration of auxin is higher on the side of the plant near the ground.

The root is sensitive to auxin concentration, and the stem is not sensitive to auxin concentration, so under the same auxin concentration, the growth of the stem is promoted, and the growth of the root is inhibited. The mountain grows with roots downwards and stems upwards.

Remember that the ratio of the late trait of the offspring pants is 9:3:3:

1,9 contains (1rryy:2rryy:2rryy:

4rryy)3contains (1rryy:2rryy)3contains (1rryy:2rryy)1 contains rryy

Therefore, the next generation of Wendan has 1 4 to talk about Hu Roll, and 1 4 is rryy