护理入学考试生物练习卷（附答案）

What does transfer RNA (tRNA) do?

1. AIt copies DNA in the nucleus
2. BIt joins two DNA strands together
3. CIt carries the code out of the nucleus
4. DIt brings amino acids to the ribosome

What is a tissue?

1. AA single cell that has one special job in the body
2. BA structure inside a cell
3. CA group of similar cells that work together
4. DSeveral organs that work together

What does DNA replication produce?

1. ATwo identical DNA molecules
2. BA new protein
3. COne mRNA molecule
4. DFour different DNA molecules

A thermometer gives readings of 36.1, 36.1 and 36.2 °C for a water bath that is really at 37.0 °C. How are these readings best described?

1. AAccurate but not precise
2. BNeither accurate nor precise
3. CPrecise but not accurate
4. DBoth accurate and precise

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

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

DNA 模板链的序列是 T-A-C。与之匹配的 mRNA 密码子是什么？

1. AU-T-G
2. BA-U-G
3. CA-T-G
4. DT-A-C

Potato cylinders are placed in sugar solutions of different strengths. They gain mass in weak solutions, lose mass in strong ones and show no change at 0.3 mol/L. What can be concluded?

1. AThe potato cells have a solute concentration of about 0.3 mol/L
2. BPotato cells are always hypertonic to sugar solutions
3. CThe potato cells contain no water at all
4. DSugar enters the cells only by active transport, not by diffusion

A plant is kept in the dark to use up its starch. One leaf is then sealed in a bag with a chemical that absorbs CO₂, and the plant is placed in light. Later, that leaf has no starch, but the other leaves do. What does this show?

1. AOxygen is needed for photosynthesis
2. BCarbon dioxide is needed for photosynthesis
3. CLight is needed for photosynthesis
4. DChlorophyll is needed for photosynthesis