In the following descriptions of biological composition, structure and function

The virus is composed of only DNA or RNA macromolecules and some protein shells, and it does not have a system to replicate genetic material, so it can only rely on the host's system to synthesize DNA or RNA and proteins. It cannot renew on its own and has no metabolism at all, while other parasites rely on absorbing host nutrients to complete, and there is a cellular structure that can complete metabolism.

Animals and plants are all-round.

1.Without a cellular structure, metabolism cannot take place.

Parasitic organisms with cellular structures can carry out metabolism.

2.Wrong. Both animal and plant cells have totipotency, and the totipotency of plant cells is greater than that of animal cells.

Plant cells have cell walls, vacuoles, chloroplasts, whereas animal cells do not.

1 I won't talk about it.

2. The criterion for whether it is a eukaryotic cell is the presence or absence of a cell membrane.

1.Because viruses have no cellular structure, they cannot live independently on their own, and they have to live parasiticly, so they rely on the nutrients of the host for metabolism. Therefore, the non-cellular structure cannot be metabolized independently, and the parasitic organisms cannot metabolize independently.

2.It is true that both animal and plant cells are eukaryotic cells, but plants should also be higher plants.

The main difference between eukaryotic cells and meta-and cells is the presence or absence of a nuclear membrane.

1.Do not say.

2.Plant cells are totipotent, and animal nuclei are totipotent. Theoretical students have the potential to develop into an individual.

In biology, () is the basic unit of functional structure.

a.Chloroplasts are the only ones.

b.Cell. c.Cell wall.

d.Organ. Correct Cover Mountain Buried Answer: B

A error, for example, plant cells and animal cells, the former has a structural cell wall, the latter does not. There are many other differences.

b Plants are composed of six organs: roots, stems, leaves, flowers, fruits, and seeds.

c correct. dThe classification of animals is very broad. The protozoa of animals are the lowest single-celled eukaryotes in the animal kingdom.

Since there is only one cell, it cannot constitute a tissue, let alone a system? But higher macrofauna are all made up of these eight systems.

1.The organism contains microorganisms i.e. bacteria are prokaryotes and also contain animals i.e. cells are eukaryotes so ax

2.The structure in a plant is made up of tissues and organs together x3The organ system x is the organ and tissue system that is functionally similar in the body.

4.There are eight major systems in the human body: locomotor system, nervous system, endocrine system, circulatory system, respiratory system, digestive system, urinary system, and reproductive system. Right.

So, choose D

A is definitely wrong, the structure of prokaryotes and eukaryotes is very different.

b is incomplete, but should be composed of roots, stems, leaves, flowers, fruits, and seeds.

c correct. dFalse, if there is a single-celled organism in an animal, such as paramecium, it does not have a system.

It's good to use the elimination method for this kind of problem, as long as you find a counterexample.

A is not the same, animal cells do not have a cell wall, whereas plant cells do.

B false, lower plants such as algae do not have organ differentiation.

d That's multicellular animals, unicellular animals such as paramecium are not.

To sum up, choose C

A false difference between animals and plants.

B False: Only higher plants have rhizomes and leaves differentiated.

c Pair. D. Wrong The mistake is "all".

I'm a teacher, trust me.

B c is absolutely wrong, just say that the urinary system, audit the function of the bladder is different.

And b refers to the composition of organs such as roots, stems, and leaves.

A is right. Because the role of the renal tubule is mainly to reabsorb some substances in the original urine, glucose, protein, etc., and the absorption process will involve active transport, endocytosis and cytosis, etc., which are required for ATP energy.

B is right. Pancreatic islet cells secrete insulin, which is a large molecule that is transported in the cell in the form of vesicles to the cell membrane and excreted in the cell, so there are more mitochondria in the Golgi apparatus.

C is wrong. **Epidermal cells are mature cells, and the cell activity is not so vigorous, so the frequency of intranuclear guide protein synthesis is not high, so there are not many nuclear pores.

D is right. Small intestinal epithelial cells can absorb proteins, etc., and explain the same as a

C nucleic acid is the genetic material of all organisms, controlling metabolism and heredity, controlling the expression of traits, a peptide bond is closely related to the formation of peptide chains, and has nothing to do with the spatial structure of proteins b regulates the body's life activities of chemical information substances such as hormones, enzymes, etc., and the chemical essence is protein, lipid, rna, etc.

dThe content of hydrogen in fat is more than that of sugar, so it consumes more oxygen during the oxidative decomposition of fat.

The answer da is wrong, because chloroplasts and other chloroplasts can also carry out photosynthesis, it has chlorophyll b error, because some prokaryotes can still carry out aerobic respiration, and their place is cytosol, such as nitrifying bacteria c wrong, because RNA organisms can reverse transcribe DNA for reproduction Satisfied, with knowledge, give it the best!

Answer: D Turtles have carapaces on their backs, which reduce water loss and are suitable structures for land life.

Answer D analysis: This question examines the structural characteristics of organisms whose structure is always compatible with their functions, and it should first be clear that the adaptation of organisms to the environment has an important relationship with the characteristics of organs

Answer: The adaptation of organisms to the environment is universal Every living organism now has a morphological structure, physiological characteristics or behavior that is compatible with the environment

a. There are a large number of root hairs in the mature area of the root tip, which can absorb a lot of water, and the structure of the organism is always suitable for its function, so it does not conform to the topic

b. The gills are composed of many gill filaments, which contain a large number of capillaries, which can fully exchange gas with oxygen in the water, reflecting the characteristics that the structure of the organism is always suitable for its function, so this item does not conform to the topic

c. The lungs are the most important respiratory organs and the main place for gas exchange Alveoli are the main parts of gas exchange The walls of the alveoli and capillaries are very thin, and only a layer of epithelial cells is composed, which is conducive to gas exchange It reflects the function and the adaptation of the living environment, so it does not conform to the topic

d. The white fur of the polar bear is a protective color, which is a manifestation of adaptation to the environment, rather than adapting to the function

Therefore, the structure of an organism is always adapted to its function, which can be analyzed from the organ characteristics of the organ

a. There are many annular folds on the inner surface of the small intestine wall, and there are many villous protrusions on the folds, which are called small intestinal villi Due to the existence of annular folds and small intestinal villi, the absorption area of the small intestine is greatly increased, up to more than 200 square meters This structural feature is conducive to the digestion and absorption of nutrients in the small intestine, so it is in line with the topic;

b. The function of the lung is located in the alveoli, the alveoli are numerous, the outside is entangled with rich capillaries and elastic fibers, and the alveolar wall and capillary wall are composed of a layer of epithelial cells, which is conducive to the gas exchange between the alveoli and the blood, so it does not meet the topic;

c. There are valves between the atria and the ventricles, between the ventricles and the aorta, and in the venous vessels, which can prevent the blood from flowing backwards during the circulation, and there is no valve in the arterial blood vessels, so it is in line with the topic;

d. The renal tubules are slender and tortuous, and a large number of capillaries are entwined around them, which is conducive to the reabsorption of the renal tubules, so it does not conform to the topic

Therefore, c