Biology Short Answer Questions, Short Answer Questions about Biology.

The former is an activity (of learning); The latter is an (instinctive) activity.

The former is an (acquired) activity; The latter belongs to activities ( congenital behavior, instinct ) .

<>This one is ATP, D right.

A mistake is that the synthesis is changed to secretion, and there is the fusion of membranes when secretion.

B is wrong in bacteria for prokaryotes, only ribosomes are one organelle, there is no organelle with a membrane.

c The pigments of cyanobacteria are phycocyanin and chlorophyll, and green algae are lower plants, and the pigments are carotenoids and chlorophyll.

In the selected answer, synthetic digestive enzymes do not reflect fluidity, but secretion of digestive enzymes can reflect fluidity.

In the answer b, bacteria belong to prokaryotes, and only the only organelle is ribosome, and ribosomes have no membrane structure.

In the C answer, both cyanobacteria and green algae carry out photosynthesis, cyanobacteria contain chlorophyll and phycocyanin, etc., and green algae contain chlorophyll.

Bacteria are prokaryotes and do not have organelles, let alone organelle membranes. Cyanobacteria only have phycocyanin and chlorophyll.

Silent Night 727 Hello! Active transport requires energy and carriers, and at this time, the intensity of respiration (including aerobic respiration and anaerobic respiration) is zero, and energy cannot be generated, and there is no way to absorb K+ without energy.

c The appearance of Cynthia does not mean that genes can directly control life activities, in fact, life activities are still indirectly controlled by genes, that is, genes are translated into proteins, and then physiological activities are carried out.

All cell organisms have lipids, because cells must have membrane structures (cell membranes & membranes of intracellular organelles), which are composed of lipids and other substances, in addition, small molecule lipids are also indispensable for cell life activities, such as some metabolic intermediates, signaling molecules, etc.

b Unicellular organisms do not necessarily contain lipids.

The first question is your answer A, and the correct answer is D. Your problem lies in mineral nutrients and oxygen.

Oxygen restricts the distribution of marine organisms because the concentration of oxygen in the ocean decreases as the depth increases; On the land surface, oxygen concentrations are almost the same.

And mineral nutrients, I think you mean inorganic small molecules, in the ocean, a wide range of concepts, the concentration of various molecules, ions should be consistent, will not limit the distribution of marine organisms.

In the second question, your answer is A, and the correct answer is B

Judging from the title, the premise is that this microscope should be a pure optical microscope, the kind without a power supply.

First of all, A is definitely wrong, even if the visual focus of these two students is different, there is no need to mediate the coarse quasi-focal spiral, just mediate the fine quasi-focal spiral;

Secondly, although this question is not rigorous, the test point should be "gently move the microscope to the classmate", so because the pure optical microscope requires a large angle of incident light, the answer should be b

Question 3: There is no reason for this, the leaves are like this.

You can expect that since the epidermal cell grows on the outermost, in order to protect the tissues inside, it must grow the densest and most closely arranged.

If you don't understand anything, you can continue to ask.

1. Because most of the marine life lives in the range of about 150 meters below the water surface, because there are planktonic plants in this range, which can produce oxygen through photosynthesis.

2. In general, the light microscope mentioned in the book can only play a role under the condition of light. The original adjusted mirror can shine the light on the observation material through the light aperture, but it has to be "moved", and the position changes, resulting in the light not being reflected to the observation material normally.

3. Epidermal cells belong to protective tissues, and in order to prevent the internal structure from being damaged, they must be closely arranged to achieve a certain protective effect.

Mesophyll cells are relatively soft palisade tissues, but epidermal cells are the first line of defense against external aggression, so they are tightly arranged and flattened in shape

Dissolved oxygen is very low in the ocean, but there is no oxygen restriction on land.

1.Aging, cancer. Aging is beneficial to living organisms.

Hehe, 28 questions, give 10 points, too little! The friend upstairs was very helpful, but there were a lot of wrong answers!

A is wrong, the arbor is large, and it is good to count, so the quadrat can be larger, and even all of them can be counted if the survey area is not large. Herbaceous plants grow densely, so the sample should not be too large.

B Yes, the quadrat size is determined according to the number of herbaceous plants, if it is dense, then the area can be smaller, it is good to count the points, if it is more scattered, then the quadrat area can be larger. It doesn't have to be 1 square meter.

c False, it is not randomly sampled within the same quadrat, it is randomly sampled within the survey area. (This is the quadrat).

d wrong, the number of quadrats can be determined according to the terrain, as long as the random sampling and the same area of the quadrat are ensured, the larger the number of samples, the smaller the error.

First of all, it is certain that option C A should be lymphatic factor, and it is not known where this error came from.

Secondly, you can find the entry of lymphokine in the encyclopedia, in the explanation of the entry you can find the function of lymphofactor, one of its functions is to promote the proliferation and differentiation of B cells into effector B cells and the production of antibodies, then A is lymphokine can be obtained;

Immunity, involving antigens and antibodies, the pathogenic role of bacteria lies in their surface-specific antigens, antigens enter the body to be recognized, thereby producing antibodies, antibodies have the ability to bind specifically to antigens, so as to exert immunity; In this regard, please keep in mind that the antigen on the foreign substance, the corresponding substance produced by itself is the antibody; When the self-substance is not recognized by the self, it may also become an antigen, and the self-substance that is not recognized can also be regarded as a foreign substance.

If you have any questions, you can continue to ask.

Substance A is B-cell growth factor (BCGF). A small protein produced by activated T cells or certain lymphocytes that promotes B cell proliferation.

B-cell growth factor, on the other hand, is a class of lymphokines. B is an antigen, so you don't need to explain it. Therefore, C

It's lymphatic factor printing errors, and you have to be brave enough to question it.