护理入学考试生物练习卷（附答案）

What is the SI base unit of mass?

1. APound
2. BKilogram
3. CGram
4. DLitre

Which codon signals the start of translation in most genes?

1. AAUG
2. BUAA
3. CUAG
4. DUGA

What is a trait that is controlled by many genes called?

1. AA recessive trait
2. BA codominant trait
3. CA sex-linked trait
4. DA polygenic trait

What happens to an enzyme after it has catalysed a reaction?

1. AIt becomes part of the product and leaves with it
2. BIt is released unchanged and can be used again
3. CIt changes into the substrate
4. DIt is broken down into amino acids

The sodium-potassium pump moves ions across the cell membrane. What does one cycle of the pump do?

1. AMoves Na⁺ in and K⁺ out, without using ATP
2. BMoves 3 Na⁺ out and 2 K⁺ in, using ATP
3. CMoves 3 K⁺ out and 2 Na⁺ in, using ATP
4. DMoves 2 Na⁺ out and 3 K⁺ in, using ATP

有氧细胞呼吸的产物是什么？

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

Which evidence supports the theory that mitochondria came from bacteria that lived inside an ancient cell?

1. AThey have a cell wall made of peptidoglycan
2. BThey have their own circular DNA, ribosomes and a double membrane
3. CThey are found in all prokaryotic cells
4. DThey make the proteins used by the whole cell, including the nucleus

Which parent's gamete decides the biological sex of a human baby, and why?

1. AThe mother's, because an egg carries either an X or a Y
2. BThe mother's, because she gives two X chromosomes
3. CThe father's, because a sperm carries either an X or a Y
4. DBoth equally, because each gives one Y chromosome