护理入学考试生物练习卷（附答案）

What is the main job of the nucleolus?

1. AIt stores water and salts for the nucleus
2. BIt releases energy from glucose for the nucleus
3. CIt makes ribosomal RNA and builds ribosome parts
4. DIt digests worn-out parts of the cell

What is the resolution of a microscope?

1. AHow many times larger it makes the image of the specimen
2. BIts ability to show two close points as separate
3. CHow large the field of view is
4. DHow bright the image appears

What is true of a recessive allele?

1. AIts trait shows whenever one copy is present
2. BIts trait shows only when two copies are present
3. CIt is found only on the X chromosome
4. DIt is always harmful to the organism

有氧细胞呼吸的产物是什么？

1. A二氧化碳、水和 ATP
2. B淀粉和水
3. C乳酸和氧气
4. D葡萄糖和氧气

A patient's blood type is B positive. What does this mean?

1. ATheir plasma contains anti-B antibodies
2. BTheir red cells carry the A antigen and no RhD antigen
3. CTheir red cells carry the B antigen and the RhD antigen
4. DTheir red cells carry no antigens at all

A bone marrow transplant can treat some blood cancers. Why does it work?

1. AThe donor marrow contains antibiotics that kill cancer
2. BThe transplant replaces the patient's bones
3. CThe donor stem cells produce new, healthy blood cells
4. DThe donor red cells divide to make more red cells

Why are modified viruses often used to deliver genes in gene therapy?

1. AViruses can reproduce without a host cell
2. BViruses are larger than human cells, so they can carry many genes
3. CViruses produce antibodies that fix faulty genes
4. DViruses naturally insert their genetic material into host cells

Pasteur boiled broth in swan-neck flasks. The broth stayed clear until the neck was broken off, when it soon became cloudy. What did this show?

1. AAir alone, without microbes, spoils broth
2. BBoiling makes broth produce new microbes
3. CMicrobes come from the air, not from the broth itself
4. DSwan-neck flasks produce chemicals that kill bacteria