Ask a few high school biology questions, a few high school biology questions

Egg cells, pollen Normal cells 2

The germ belongs to normal cells.

So, the germ is 6 times more developed and the pollen is 3 times more developed.

In vitro culture and other cell engineering methods should be used.

It must be pure, because it all comes from this haplotype genome. But it doesn't have to be diploid. It's entirely possible to replicate more. The amount and timing of colchicine need to be controlled.

1.Pollen has 3 sets of chromosomes like egg cells, and germ cells have 6 sets of chromosomes. So pollen develops into haploid and germ cells develop into 2ploid.

2 All need to be cultured in vitro, colchicine to double chromosomes and other technologies.

3 First of all, it must be homozygous, and as for how ploidized it is, it depends on the amount of colchicine, so the answer should be d.

1. Unconditioned reflexes are naturally produced by the evolution of the organism and do not require the participation of the cerebral cortex.

2. After normal people go to the cold environment, the pores shrink, the evaporation of water decreases, and the water in the body increases, so the water in the body is appropriately reduced by reducing the secretion of antidiuretic hormone. The enzyme activity is basically unchanged. However, the activity of respiratory enzymes increases, because the respiration of the body's cells is enhanced after the cold environment, so the activity of the enzymes is increased.

3. The principle of fertilization is to increase the content of mineral elements in the soil. Reasonable dense planting is to increase the full use of sunlight by the plant body.

4. The direct value can be seen, while the indirect value is not known or unclear now, and it needs to be studied to know.

5. Kind of method.

6. It can act on hormone-secreting cells or glands, such as thyroid hormones. Thyroid hormones act on almost all posters, mainly due to negative feedback regulation on pituitary cells.

7. Hierarchical regulation means that the hypothalamus secretes hormones to act on the pituitary gland, and the pituitary gland secretes hormones to act on the back glands. In this way, it works from level to level. Only humoral regulation, no neuromodulation.

1.Unconditioned reflexes are innate, uncultivated.

Increase the composition of various inorganic salts. For example, potassium ions or something. The purpose of proper dense planting is to reduce the amount of organic matter consumed by respiration. The principle seems to be that by increasing the carbon dioxide concentration appropriately, it can be reduced.

4.Indirect should be the impact on the environment.

5.I just remember how to count. The number of the first catch * the number of the second catch The number of marks = the total.

6.The last question is both.

1.Yes 2No change.

3.It is to prevent the carbon dioxide concentration from becoming too high.

Sampling, marker refill.

7.Neuromodulation is the mainstay, supplemented by humoral modulation.

1) The total amount of solar energy fixed by corn c = energy a contained in jade closed potato rice + energy consumed through cellular respiration b

a+B2) The transfer efficiency of poultry and livestock raised with corn is 15, and the total energy absorbed by poultry and livestock in the food accounts for only 15% of the total energy of the food (corn). The total energy really absorbed by poultry and livestock is d = 15% * a

The energy value of the increased organic matter of poultry and livestock e = the total energy really absorbed by poultry and livestock d * the proportion of the energy value of the dried organic matter of poultry and livestock to the total energy actually absorbed by poultry and livestock.

This proportional dust example = 1 - the proportion of poultry and livestock respiratory consumption during the growth process, that is, the proportion of corn respiratory consumption during the growth process = 1-b (a+b).

So e=15%*a*(1-b (a+b)).

Question 6 emphasizes that one spermatogonia is not an individual, and that a spermatogonia can only produce 2 types of 4 spermatogonia without cross-exchange, so A is wrong. Option 16b is not wrong in itself, but it is not part of Darwin's doctrine of natural selection.

Your questions are 6 and 16.

Question 6: Option A is obviously male germ cells, focusing on one of these quantifiers, a male germ cell intelligently produces two kinds of gametes, and if it is a group it can produce four kinds of gametes.

Option b gene mutations are mutations at the molecular level that cannot be observed with a microscope.

Option C only satisfies the law of segregation if there is a pair of alleles on homologous chromosomes, where the A gene is on the autosomal and the A gene is on the Y chromosome, which will be freely combined in the phase of minus one, and finally have a 1 2 chance of being present in the same gamete.

That one... I made a mistake in reviewing the question... Just say option A.

Question 16: Item B is true, but the view of modern biological evolution is not proposed by Darwin, and one of the limitations of Darwin's theory of natural selection is that the explanation of biological evolution is limited to the individual level.

This is the difference between chromosomes and natural evolution.

The first question can be thought of like this:

Suppose: If there are x amino acids, then dehydration and condensation will lose (x-1) water molecules, so 110x-18(x-1) = 2778

Solution x=30

Then there are 3x+3 base pairs, which is 93 pairs.

Can you do a few fewer questions? If you don't give wealth value, you can just adopt it, but I'm afraid that you won't even adopt it, and you will have to 、、、 words for a long time

1. It does not occur when it finally stabilizes.

2. There should be no natural selection.

3. A male can mate with multiple females in another breeding season 4. Gibberellin promotes the elongation of stems and causes crazy growth.

5. Somatostatin, ethylene, etc. also have an effect.

6. It's hard to say. High school biology generally believes that there are no hormones involved in 7, too little, not considered

In option C in 1, the endoplasmic reticulum is the site for the synthesis of secreted proteins, and the proteins synthesized in the rough endoplasmic reticulum are transported back to the Golgi apparatus in the form of vesicles, which are then secreted by the Golgi apparatus to the cell. So option C is not right, and his emphasis is on synthesizing all proteins.

2 Petal cells generally do not contain chloroplasts, and there are large vacuoles in the petal cells, which occupy a large space. Because there are no chloroplasts, light and action cannot be performed.

3. The virus cannot carry out metabolic activities independently, and its metabolic activities are completed with the help of the host cell, so its energy** is still provided through the respiration of the host cell.

1 The rough endoplasmic reticulum is the site of protein synthesis, and the smooth endoplasmic reticulum is the site of the synthesis of lipids.

This is true in microorganisms.

1c answers in the synthesis of proteins on ribosomes.

2Yes, yes. 3. The host cell is dependent on energy metabolism, and the host cell satisfies the above conditions.

1.In microorganisms, the rough endoplasmic reticulum is the site for protein synthesis, the smooth endoplasmic reticulum is the site for fat synthesis, and the endoplasmic reticulum ribosomes synthesize secreted proteins.

2.Yes. Yes.

3.The virus is not considered. There may be no respiration.