When it comes to the selection of creatures, explain them in detail, and explain them in detail abou

A is chosen because B has already been fertilized and C is the blastocyst developed from the fertilized egg.

First of all, germ cells can be sure, so don't be confused.

2. It is a fertilized egg, and embryo transfer is carried out after in vitro fertilization, so the operation object is a fertilized egg.

3. Early embryonic cells If you want to divide embryos, you will be dealing with early embryonic cells.

Got it.

Pick D. Because the main ingredient of donkey skin is protein, and the ejiao boiled by it has a special tonic effect, which can speed up the body's metabolism, promote the production of cell tissues, and enhance human immunity, and protein has these functions, so it can be seen that the tonic effect of ejiao is likely to provide some essential amino acids for the human body.

All elements that account for more than the total weight of the human body, such as carbon, hydrogen, oxygen, nitrogen, calcium, phosphorus, magnesium, sodium, etc., are called macro elements.

1. Trace elements such as ZN, FE, CA can promote the absorption of nutrients by the human body, such as FE and hematopoietic stem cells, hematopoietic stem cells regenerate various blood cells, all of which must require the participation of FE. Therefore, relatively speaking, it can enhance the metabolism of the human body, promote the regeneration of pure tissue cells, and enhance immunity.

2. Metabolism and cell regeneration, to a certain extent, a certain amount of amino acids are needed to synthesize proteins, such as metabolic enzymes, the composition of cell membranes, etc., which all require proteins. There are 20 kinds of amino acids in the human body that need but cannot be supplied by themselves, and they need to be supplied outside the body, and Ejiao has them. In addition, it can enhance immunity, which is similar to the synthesis of immune cells, immune proteins, etc., which require the synthesis of protein count.

Answer: B

Analysis: Item A, when malnutrition, the amount of plasma protein synthesis decreases, and the plasma osmotic pressure decreases, so that water enters the interstitial fluid, causing tissue edema.

Item b, the plasma osmolality is increased due to the food being too salty, and water should be absorbed from the interstitial fluid, and the interstitial fluid will be reduced, which will not cause tissue edema.

C, the protein in the plasma exudes from the capillaries into the interstitial fluid, and as a result, the concentration of protein in the interstitial fluid is increased and the concentration of protein in the plasma is decreased, so that the osmotic pressure of the interstitial fluid increases and water absorption causes edema.

When the lymphatic vessels are blocked and the lymphatic reflux is blocked, the macromolecular proteins in the interstitial fluid cannot flow back to the capillary lymphatic vessels, resulting in an increase in the concentration of interstitial fluid, and an increase in the interstitial fluid and causing edema, which is called lymphedema.

Option B, increased interstitial fluid means that there is too much water seeping out of the blood vessels.

The condition for osmotic outflow is that the crystal osmotic pressure of the interstitial fluid is greater than that of the blood vessels.

Then, where the concentration of proteins, salt ions and other molecules is high, the osmotic pressure of the crystals is large.

In other words, a decrease in protein in the plasma or an increase in the concentration of protein in the interstitial fluid will increase the osmotic pressure of the crystals, causing edema.

ACDs all meet the above criteria.

B, on the other hand, is the opposite.

The water absorption of biological cells is related to the elimination and the osmotic pressure on both sides, the high osmotic pressure will take the water from the side with the low osmotic pressure, the plasma protein of options A and C will decrease, which will reduce the osmotic pressure of the blood and exclude the water into the interstitial space, while B according to the explanation, will not cause the plasma to be water, but water absorption, so option B will not be water into the interstitial space of the tissue cells, so B is the answer.

The macromolecular substances in option D and the plasma proteins in A and C play the same role in regulating osmotic pressure.

1) A solution in the first test tube is (ATP) solution, which means that fluorescence can be converted into (ATP).

2) Fluorescein luminescence is due to the (hydrolysis) reaction of a substance in a solution, which is expressed as (ATP ADP + PI).

3) The purpose of setting up test tube B is to prove that glucose is not a direct energy supply substance, and thus to prove that a substance is a direct energy supply substance for life activity energy

Explanation: Fireflies need ATP to power their luminescence, and from this point of view, the topic is simple.

1、c。A change in one base of DNA in a chromosome is a genetic mutation.

3、。5、c。It's tetraploid and has four sets of chromosomes, 48 strands, so each chromosome set has 12 strands.

Choosing AA has reed ridges, and some synthetic plant growth regulators can be harmful to human health. There is one that can delay the germination of potatoes (I forgot the mid-range of the name), which is harmful to the human body.

B auxin sells in high concentrations and can kill dicots, correctly.

c duality, correct.

d correct.

Plant growth regulator ingenuity features:

It has a wide range of functions and many application fields.

The dosage is small, the speed is fast, the benefit is high, and the residual toxicity is less.

It can control the external traits and internal physiological processes of plants.

Strong pertinence and professionalism.

The use effect of plant growth regulators is affected by a variety of factors, and it is difficult to achieve the most filial piety.

As you can see from the above, option C is wrong.

The answer is to explain the transmission of pain first: the pain sensation is first touched by the needle to the receptor, which produces a nerve deficit impulse, and then from the input nerve to the nerve center, which produces pain and feels pain, and then transmits this signal from the efferent nerve to the receptor (muscle). ) produces a hand retraction motion.

So the feeling of pain is in the nerve center.

This question should be white.