Biological problems, urgent help Biological problems, urgent

The light reaction provides energy for the dark reaction, and the light reaction has the formation of oxygen, and the dark reaction produces sugars, you are right.

Photosynthesis produces water, but the water consumed and the water produced cancel out in the equation. Photosynthesis is related to transpiration, generally speaking, when the stomata are opened, transpiration is strengthened, and photosynthesis is also strengthened, but when transpiration is too strong, the cells will lose water, so the stomata will be closed at this time, so that the carbon dioxide in the air can not enter the plant cells through the stomata, so that photosynthesis is slowed down.

Friends tell you that the 3G wireless broadband of wireless Internet, telecommunications, China Unicom went to the business hall to ask us that the charge for Unicom here is more than 900.

Cells, including broadband, you downstairs see anyone around the box or ad can go to them;

You can find that it is not Unicom Office** generally 2M ADSL Internet access.

You can write the total reaction of the concubine.

6c02+12h20=c6h12o6+6o2+6h20

Among them, the oxygen in the oxygen is all ** than water.

Alveoli - red blood cells - cells throughout the body - mitochondria.

A total of 12 layers of film.

A is cell fusion, genetic engineering needs to cut the target gene with restriction enzyme and then bind to the carrier, and then introduce it into the recipient cell to make it express.

Therefore, BC should be chosen as a gene mutation.

d is self-contained, non-artificial.

a belongs to cell engineering.

The concept of genetic engineering is the artificial, purposeful, and directed manipulation of genes.

None of them are genetic manipulations. C is not a genetic manipulation, D is a DNA manipulation.

Genetic engineering refers to the modification of the genetic characteristics of organisms by modifying genes or genomes according to people's wishes. For example, recombinant DNA technology is used to transfer foreign genes into E. coli for expression, so that E. coli can produce products that people need; Exogenous genes were transferred to animals to construct transgenic animals with new genetic characteristics; By means of gene knockout, animals with genetic defects are obtained, etc., so the answer B is correct, and the answer A is the immune process of human lymphocytes, which will occur in the human body itself, and is not achieved by human will or technical means.

The so-called genetic engineering, then there must be someone involved, as for the answer a I think: B lymphocytes are a kind of immune cells, which have the ability to kill harmful bacteria in the body, which belongs to an instinct, c This belongs to genetic variation, and D has a word, self, which does not belong to human behavior. So the answer is b, if it is different, deduct the definition, or add me 470408417

The essence of genetic engineering is that the donor provides the target gene, introduces the recipient (expresses the target gene), and the gene remains unchanged, and the synthetic protein remains unchanged, but the synthesis site is transferred. A: I think it belongs to the preparation of monoclonal antibodies, that is, animal cell fusion.

A is cell fusion.

B is genetic recombination.

See the book for details.

Item A is just cell fusion, item B is genetic recombination, item C is gene mutation, and item D is a viral invasion of bacteria.

B is genetically recombinant,,, nothing else is said. Didn't A, it was cell fusion.

A is cell fusion, B is genetic engineering (the principle of genetic recombination), C is gene mutation, and D is obviously wrong

I can't help it, this is a question I seem to have done in my third year of high school.

The answer should be B. Genetic engineering is mainly to artificially alter genetic material and purposefully modify inherited genes.

A belongs to cell fusion, not genetic engineering.

Due to the action of oxygen in the air, the virulence of cholera bacteria decreases day by day.

Due to the action of oxygen in the air, the virulence of cholera bacteria decreases day by day. It's not in the original text.

The results showed that the contact time between the bacterial solution and oxygen was inversely proportional to the mortality rate.

(1) Recessive.

Dear, fruit flies are diploid organisms of course four of them.

There are two points involved, first, the difference between homeothermic animals and cold-blooded animals. The body temperature of homeothermic animals will remain constant, while cold-blooded animals will change depending on the environment. Second.

The relationship between enzyme activity and temperature, when the temperature is too low, most of the enzyme activity decreases, and the body function of cold-blooded animals declines, so they will enter hibernation. To sum up, the answer is B

The walls of blood vessels have a certain elasticity.

It depends on what kind of animal, some animals hibernate to lower body temperature, such as frogs, and some do not change so much, such as black bears. Then there's the rate of metabolism. Because the body temperature rises, the enzyme activity increases, and the heat production is accelerated.