Biology book after class answers, biology full answers

Judgment: 1 must be wrong, the second line of defense in the three lines of defense of the human body is the bactericidal substances and phagocytes in the body fluids, so phagocytes play a role in the second line of defense (non-specific immunity), in the three lines of defense, whether it is cellular immunity or humoral immunity, phagocytic cells need to process antigens, so phagocytic cells also play a role in the third line of defense (specific immunity).

2, 3, 4 are all right, so there's nothing to say.

Select: 1D. If the cells of their own tissues are senescent, cancerous, lesions, etc., they will become antigens, and then when the autoimmunity is too strong, their own tissues and organs will be regarded as antigens, such as systemic lupus erythematosus, rheumatoid arthritis, rheumatoid heart disease, so A is wrong, effector cells do not bind to antigens, effector T cells are bound to target cells, B is wrong, if proteins and their hydrolysates can cause immune responses, then let's not eat meat in the future, there are more proteins, It will also be broken down into amino acids, so C must also be wrong, and only D is right

2c。I don't think there's anything to talk about this topic, about cellular immunity, is the effector T cell nucleus binding to the target cell to lyse the target cell and die.

Short-answer question: It is best to use your own will not have immune rejection, the parents' ** and his genetic material are different, it may happen, and the twin brother is also identical or fraternal, identical twins have the same genetic material, can be transferred, and if the genetic material is not the same, immune rejection may occur, so it is best to use your own **.

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(1) In a certain temperature range, the mass of organic matter synthesized by photosynthesis per hour of leaves increases with the increase of temperature.

4) Increase light, lower temperature, and ventilation.

1c Polyp 2 The following organisms belong to the producer: a

4 The following groups of gymnosperms are:

ginkgo biloba and pine.

5 The following substances that turn blue when exposed to iodine are: C starch.

6 Ripe corn kernels are actually one: bfruit.

7 For potted flowers often loosen the soil can: () a

The effect of increasing the growth point of the 8 leaf buds of respiration is:

bGrow young leaves.

9 The natural nature of the biosphere in the production of organic matter"factory"Yes: () a green plant.

10 The reasons why many cucumber flowers, loofah flowers, and pumpkin flowers do not bear fruit are:

b does not have pistils.

11 Transplanting on a cloudy day or in the evening, and removing some of the branches and leaves, is for:

b. Reduces transpiration.

12 Proceeds to any part of the plant body.

bRespiration.

13 The objective lens of the microscope is 40, and to observe the image of the object with 600 times magnification, the eyepiece that should be selected is B15 14 The following organisms that do not have a cellular structure are: C virus 15 In the structure of the seed, the future development of new plant larvae is: C embryo 16 The following environment is most suitable for seed germination

aMoist and soft soil.

17 After the completion of fertilization, the development continues to:

d ovary 18 developed into the edible part of the peach is:

aOletary wall. 19. When the seedlings are moved, the roots are carried with mounds of soil for the purpose of.

d Avoid harming the root hairs and young roots.20 The main reasons for the lack of grain in the ears of corn are:

bInsufficient pollination.

The 21 water-absorbing parts are mainly by the tip of the root:

d Mature Zone. 22 The gateway for gas exchange between the blade and the external environment is: b stomata 23 The organization of transporting water and inorganic salts is:

b. Conduction tissue.

24 The carbon-oxygen balance in the biosphere is maintained

Photosynthesis.

1. The structural level of living systems: cells, tissues, organ systems (plants have no systems), individual populations.

Community, ecosystem, biosphere.

Cell: It is the basic unit of structure and function of living organisms. With the exception of viruses, all living things are made up of cells. Cells are the most basic living systems on Earth.

2. The operation steps of the optical microscope: observe the light with a low magnification objective lens and move the field of view** (which one is offset).

High-power objective observation: Only fine collimation spiral can be adjusted; Adjust the wide aperture, concave thick mirror.

3. Cell type: According to whether there is a nucleus in the cell with the basic defense of the nuclear membrane as the boundary, the cells are divided into prokaryotic cells and eukaryotic cells.

Note: Comparison of prokaryotic and eukaryotic cells:

Prokaryotic cells: cells are small, without nuclear membranes, nucleoli, and no formed nucleus; The region where the genetic material (a circular DNA molecule) is concentrated is called the nucleomimetry; There are no chromosomes, DNA does not bind to proteins,; Organelles have only ribosomes; There is a cell wall (the main component is peptidoglycan) that is different from eukaryotic cells.

Eukaryotic cells: cells are larger, with a nuclear membrane, nucleolus, and a true nucleus; There is a certain number of chromosomes (DNA combined with proteins); There are generally a variety of organelles.

Prokaryotes: Organisms made up of prokaryotic cells. For example, cyanobacteria, bacteria (such as nitrifying bacteria, lactic acid bacteria, Escherichia coli, pneumococcus), actinomycetes, mycoplasma, etc. are all prokaryotes.

Eukaryotes: Organisms made up of eukaryotic cells. Such as animals (paramecium, amoeba), plants, fungi (yeasts, molds, slime molds), etc.

With the exception of viruses, all living things are made up of cells. Cells are the most basic living system on the earth 2. The operation of the optical microscope is very sudden: the light is observed with a low magnification objective lens, and the moving field of view is high.

1).A centrosome.

2).4 Leaves are vertically mammoths.

3).Mitochondria aerobic exhalation bridge aspiration.

4).Chloroplasts and vacuole cells are close to the walls.

22.(1) Venous thin arteries.

2) Capillary one slow.

3) Oxygen carbon dioxide.

The answer is: a.

There was potassium in group B and a high amount of pants in the year-old pants, while there was no potassium in the other four groups, and the yield was lower than that in either the finger or group B, indicating that the place was deficient in potassium.