15 points before 20:00 on October 7th! High School Biology, Molecules and Cells

1. Salivary gland cells secrete salivary amylase, which is a secreted protein, so it needs more ribosomes and Golgi apparatus, while the secretions of sweat glands are not dominated by protein, so it is wrong.

2. All living cells can synthesize enzymes, because the chemical reactions in the cells basically need to be catalyzed by enzymes.

3. Oxygen through the membrane is free diffusion and does not require energy. The alveoli are a layer of cells, and oxygen needs to pass through 2 membranes to pass through the cell, and the capillary wall is a layer of cells, and oxygen needs to pass through 2 layers of membranes to pass through the cell, and the red blood cells themselves have a membrane.

1.Sweat gland cell function: secrete sweat, sweat is mainly water and inorganic salts, no protein and other useful substances to the human body, so the anabolism of sweat gland cells is slow, ribosomes and Golgi apparatus are less.

Salivary gland cells can secrete salivary amylase, which belongs to secreted proteins, while ribosomes are the sites where proteins are made, and the Golgi apparatus is associated with the formation of secretions from animal cells. Thus, salivary gland cells have more ribosomes and Golgi apparatus, which is determined by their function.

2.Enzymes are produced by living cells, and because thyroid cells can secrete thyroid hormones, they need to be catalyzed by enzymes to carry out biochemical reactions.

3.First of all, oxygen flows in and out of the cell in a way that diffuses freely, without consuming the energy produced by cellular metabolism. Oxygen enters human red blood cells from the alveoli through at least five layers of biofilms, and the alveoli are made up of one layer of cells, and oxygen passes through two layers of cell membranes through this layer of cells.

Then it has to pass through the capillary wall, which is also made up of one layer of cells, and the cells that pass through the capillary wall need to pass through two layers of cell membranes. Finally, it enters the red blood cells, which pass through a layer of cell membrane.

Event 1 of a plant indicates that the somatic cells of highly differentiated plants can directly develop into complete plants through proper culture, indicating that the somatic cells of highly differentiated plants are totipotent. d right.

However, event 2 says that somatic nuclei can only develop into complete individuals in egg-bearing cells, but in any case, animals and plants can embody totipotency (develop into a complete individual) through a highly differentiated nucleus with an appropriate cytoplasm, which shows that highly differentiated animal and plant nuclei are totipotent, b pair.

Since it can develop into a complete individual, it means that the nucleus should store a full set of genes, so c is also correct.

The title A does not express the statement that highly differentiated animal cells are totipotent, the cytoplasm is that of egg cells, and he can only say that the nucleus is totipotent.

AA, highly differentiated animal and plant cells are all totipotent is false, highly differentiated animal cells are.

Totipotency, the nucleus of the animal cell is totipotent.

Item B, it is correct that the nucleus of highly differentiated animals has totipotency, referring to item A to explain item C, the genes that are not expressed in the differentiated cells are still present in the nucleus and have not disappeared, which mainly involves the selective expression of genes.

Item d, highly differentiated plant cells have totipotency is good, the textbook explains this in detail, you just have to remember that (highly differentiated plant cells have totipotency) This sentence is very useful.

Selective cell totipotency refers to the fact that in multicellular organisms, the nucleus of each somatic cell has all the genes of ontogeny, and can develop into a complete individual as long as conditions permit.

1. Carrot phloem cells can develop into complete plants through culture.

This indicates that highly differentiated plant cells are totipotent.

2. The nucleus of sheep mammary gland cells is transferred into the enucleated egg cell, which can develop into sheep with reproductive ability.

This indicates that highly differentiated animal nuclei are totipotent.

The differentiation itself is the result of selective expression of genes in the cell. The genes present in every cell are the same.

So BCD is correct.

And the statement "animal and plant cells" in answer A is incorrect.

Choose A, because A is wrong, so B is right. c is the selective expression of the gene and d is correct.

This is a 7th grade biology question, and the answer is as follows, and I'll give it to you directly, and if it's good, I'll add some points.

Think for yourself, I hope it helps you!

Explanation: Carbon dioxide is necessary for photosynthesis, and the carbon dioxide of device A in this question is absorbed by sodium hydroxide.

Answer: A and B are placed in the dark for a day and night, then moved together to the sun, and after a few hours, the leaves are removed to check whether they both have starch formation. The device with blue leaves is A, indicating that A has starch production, and the device with non-blue leaves is B, and the comparison between the two indicates that carbon dioxide is needed for photosynthesis.

The device pictured below was designed to verify that carbon dioxide, one of the raw materials for photosynthesis. The tanks of plant A and B are filled with two liquids, water and sodium hydroxide respectively (the liquid in the tank of device B can absorb carbon dioxide). Put both devices A and B in a dark place for a day and night, then move them together to suitable light, and after a few hours, remove the leaves to check whether they have starch formation.

A device with blue leaves indicates that there is starch production, and a device with non-blue leaves is B A comparison between the two indicates that carbon dioxide is required for photosynthesis

In the dark, sunlight A has B carbon dioxide in the dark place in order to consume the starch in the original leaves.

……Please hurry up and take the answers! So many people have answered, what do you want the rest of us to do?!

In the dark, the sunlight device A has the carbon dioxide of the device B.

B: The three pathways are oxidative decomposition for energy, synthesis of liver glycogen and muscle glycogen, and conversion into non-sugar substances and amino acids, of which the oxidative decomposition function is the most important, but the time is short, and it can be converted into non-sugar substances and amino acids in 1 to 2 hours.

C: B is a patient with glyco-state urine disease, insulin can promote the respiration of somatic cells, the absorption and conversion of sugar, and at the same time can inhibit the intestinal absorption of glyconclei and inhibit the breakdown of glycogen and fat (PS: insulin will promote the absorption of sugar in the original urine), so it is not a decrease in protein decomposition.

D: The main way of sugar excretion in diabetic patients is to excrete it with urine, so it is called glycosuria.

To put it simply, if I were to do these flow charts, each of them would consist of three large parts:

1. Model selection, taking the first question as an example, is cells isolated from viral induced liver cancers, which involves the collection of patient specimens from patients with liver cancer due to hepatitis B (the control group is people without liver disease), and the isolation and culture of primary cells from these specimens.

2.The intervention, taking the first question as an example, is to add garlic extraction, and it is recommended to establish a gradient in the processing time and throughput (the blank group is only the extract used to extract the garlic extraction).

3.Detection indicators, take the first question as an example, on gene expression in cells, here you have to carefully select which genes to detect, because the cancer under discussion, the routine is generally proliferation, apoptosis, and migration, then select genes related to hyperplasia, apoptosis, and cell adhesion, and then extract RNA for rt-pcr, and extract protein for western.

The second question is similar, and the modeling and intervention have been specified in the question.

The third question is very open, if I write, I will directly go to mice, inject mice, detect adult mice and fetal mice, in addition to observing whether there are deformities with the naked eye, go to the internal organs and muscles and nerves to make slices and stains, and then take blood and urine to test a series of biochemical indicators, mate for several generations to see reproductive ability, and then do some behavioral experiments to see if there is mental illness.

The fourth question is similar to the third question, both to see if there is mutagenicity, so except for the mouse injection, everything else can be similar.

So much gibberish, I hope it helps

Biofilm systems.

Nuclear membrane Organelle membrane Cell membrane.

Chloroplasts, mitochondria, endoplasmic reticulum, vesicles, Golgi apparatus, vesicles

Leaf line.

Cyst green grains.

Body, body, body.

Thin film inside and outside.

Membrane Membrane Membrane.

Mendel's theory here refers to the law of free combination.

The offspring obtained from the cross between dominant homozygotes and recessive homozygotes are all dominant, in accordance with Mendelian laws of inheritance. However, Mendel's theory draws that the separation ratio of F2 offspring from inbreeding is 3:1, and it cannot be concluded that all white-eyed males are derived.