Biology, analysis, biology for detailed analysis

1.The following structures within the cell contain the most lipid components (a).

a.Cell membrane BRibosome CCell fluid DNuclear fluid.

The basic scaffold for biofilms is a bilayer of phospholipid molecules. Phospholipids are one of the lipids. Ribosomes are membrane-free organelles made up of proteins and RNA. 】

2.For a cell's membrane to have only a free-diffuse mode of transport, the substance that handles the cell is most likely (b).

a.Amylase BProtease CLipase DInsulin.

There are two modes of transmembrane transportation of substances: active transportation and passive transportation. Passive transport is divided into free diffusion and assisted diffusion. Among them, both active transport and assisted diffusion require the assistance of carriers on the membrane, while free diffusion does not.

The membrane is responsible for the carrier function of protein. So. 】

3.Among the following phenomena is osmosis (d).

a.Water molecules pass through the cell membrane BGlucose molecules pass through the cell membrane and ions pass through the protoplasmic layer.

d.Water molecules pass through the protoplasmic layer.

osmosis", must be water. The way in which glucose enters the cells of the wall of the small intestine is active transport, so b is not rigorous. c, the entry and exit of ions is generally in the form of active transport, such as renal tubular reabsorption.

I've done this question, is your option A wrong, it should be "cell wall". If there is no mistake, please add the question or send me a message on the site. 】

4.Placed in the sucrose solution, the plasmo-wall separation of the cells will occur (D).

a.Human oral epithelial cells bDry seed cells CCells of the onion meristem.

d.Onion epidermal cells.

Human oral epithelial cells and dried seed cells, as well as onion meristem cells, do not have large vacuoles

5.What is the function of the biofilm that is simulated by desalination treatment (b).

a.Function b. for the transport of substancesSelect Function CProtection function dMessaging features.

Allows water molecules to pass through and refuses to let Na+ and Cl- plasma pass through. It shows the selective permeability of the biofilm. 】

1. A membrane is: phospholipid bilayer ribosome: RNA, liquid is not interpreted.

2. B can only diffuse freely, indicating that the carrier on the membrane (the carrier is a protein) is destroyed, so it is a protease.

3. AB and C are assisted diffusion (to carrier), and the whole process of D is not considered transmembrane transport (the cell membrane, vacuolar membrane and the substances between these two membranes of mature plant cells are often called protoplasmic layers, and it belongs to transmembrane osmosis).

4. D There is a need for large vacuoles for plasmid wall separation (mature plant cells have large vacuoles), but there are no human cells, no dry seeds, and no meristem (meristem characteristics: tight arrangement, thin cell wall, large nucleus, concentrated cytoplasm, and very small vacuoles).

5. b Seawater desalination is to let the water pass through the salt without passing, similar to the selection of permeability function.

Genes and environment are common (the same genotype has different manifestations because of environmental influences).

The female sheep with the genotype AA (this question is to verify whether the male sheep is AA or AA, from the later topic, it can be known that the offspring have hornless female sheep, which proves that the mating object must have a genotype must contain A, then the female sheep has two possibilities: AA or AA, assuming that both male and female are AA, then the genotype of the offspring is AA, AA, AA, AA, assuming that there are 8 offspring, 4 males and 4 females, 1 for each genotype, then according to the title, there are 3 hornless males and 1 hornless female, which does not meet the ratio of 1:1; Assuming that the male sheep is AA and the female sheep is AA, or assuming that the male sheep is AA and the female sheep is AA, the result is that there are 4 hornless males and 2 hornless females, which also do not meet 1:

1, so it can be excluded that the female sheep is AA, and its genotype is AA) AA (AA AA, all offspring are hornless) Horned male: Horned female: Hornless female = 2:

1:1, the genotype is AA (it can be known that there are only two genotypes possible for male sheep, the last blank has been filled in AA, this blank must be AA, and then according to the mating genotype results, the number of male and female sheep can be obtained by using my above assumptions to determine the proportion).

Hope it helps.

Why is there a time limit? There is no time limit to type.

Option D, item A: Only the pigments in chloroplasts can absorb the converted light energy. There is no DNA in the B centrosome, C can perform base pairing behavior and produce water organelles as long as there is DNA, such as chloroplasts, mitochondria, etc.

A: All enzymes in living organisms are proteins, so proteases can hydrolyze enzymes (individuals have a question, how to protect themselves from hydrolysis when proteases are hydrolyzed).

b. If both the inorganic catalyst and the enzyme are in the most suitable conditions, the efficiency of the enzyme is much higher than that of the inorganic catalyst, but the activity range of the inorganic catalyst is much larger than the range of the enzyme, beyond this range, the activity of the enzyme is very low or directly denatured.

c. Vigorously growing mesophyll cells, the number here is the three processes of ATP production, the matrix, the mitochondrial matrix, the mitochondrial inner membrane, and the last one is the site of the main ATP production.

D. ATP water is radiant.

The answer is: d.

aCorrect, different proteins generally contain different amino acids;

b correct, such as trypsin and pepsin, the structure is different, but both have the function of hydrolyzing proteins;

c Correct, this item does not need to be explained;

D, the dehydration and condensation between the amino acids that make up the protein are all the same, which is the dehydration and condensation between the carboxyl group of an amino acid and the amino group of an amino acid.

d is wrong.

The amino acids that make up proteins can only be amino acids, and when dehydrated and condensed between molecules, they can only be dehydrated and condensed between carboxyl and amino groups adjacent to carbon. There is only one way, and there can be no second.

D is wrong with the formation of proteins.

Connection method. About 20 kinds of amino acids are used as raw materials, and amino acid molecules are linked to each other to form peptide chains on ribosomes in the cytoplasm. The amino group of an amino acid molecule is connected by removing a molecule of water, and this combination is called dehydration condensation. The bond that is formed between the carboxyl group and the amino group through the condensation reaction that connects two amino acid molecules is called a peptide bond.

Compounds formed by peptide bond bonding are called peptides.

I don't know if it's d

The amino acids are formed by dehydration and condensation of amino and carboxyl groups, and there seems to be no other way.

There is only one way to choose D amino acid dehydration and condensation, which is to remove a hydrogen (H) from the amino group (-NH2) of the previous amino acid, and remove a hydroxyl group (-OH) from the carboxyl group (-COOH) of the latter amino acid

c.The amino acids that make up proteins can be dehydrated and condensed in different order of arrangement.

(1) Answer: No.

Solution: Since gene A and gene B are on the same chromosome, and genes A and B are on the same chromosome, these are two pairs of alleles on a pair of homologous chromosomes, so they do not follow the law of free combination of genes.

2) Answer: 1; 1； 0。

Solution: Male and female individuals with the genotype AABB mate, and the offspring are AABB (lethal): AABB:AABB (lethal) = 1:2:1, so there is only one genotype left, there is no homozygous, and there is only one phenotype.

3) Answer: No cross-swap can occur.

Solution: Referring to the results of question (2), it can be seen that if there is a cross-swap, the offspring will not be able to maintain the equilibrium.

d.It is composed of several amino acids, which are peptides; At least a few amino carboxyl groups indicate that there are no amino and carboxyl groups on the R group of the hexapeptide, so there is only one free amino group and one free carboxyl group on both sides of the polypeptide.

Six amino acids form a six-prong, and five peptide bonds are formed, and five amino groups and five carboxyl groups undergo dehydration and shrinkage, leaving only one amino group and one carboxyl group next to the six fetus.

First of all, each peptide chain, except for the R group, has at least one amino group and one carboxyl group, and because it is a hexapeptide, it should be composed of seven amino acids.

The answer is: c.

The meaning of the figure is that with the increase of auxin concentration, the time taken to grow 1 cm is prolonged, that is, with the increase of auxin concentration, the growth rate decreases, reflecting the inhibition of high concentration of auxin.

There was no inhibition of the growth of the terminal bud of the plant in item a;

In item b, the stems did not show inhibitory effect at either high or low concentrations;

In item c, the dorsal side of the horizontally placed root is promoted, while the proximal side is highly inhibited;

The backlit side of the lower tip of item d is also a high-concentration boosting effect.

According to the figure, it is clear that the p-point is a high concentration that inhibits plant growth.

The answer is: c.

The yuyuan genotype of colored individual x is: AAB, the genotype of the colorless plant used in the measurement of Qingju collapse is: AAB, and the genotype, phenotype and proportion of the offspring individual answer group are AABB (colored).

AABB (colorless): AABB (colorless): AABB (colorless) = 1:

1:1:1, so item c is wrong.