护理入学考试生物练习卷（附答案）

What is a mutagen?

1. AA protein that repairs damaged DNA
2. BAn enzyme that copies DNA
3. CSomething that can cause changes in DNA
4. DA cell that divides without control

什么是基因？

1. A携带遗传性状的一种细胞
2. BDNA 中编码蛋白质等产物的一段
3. C在细胞分裂前复制 DNA 的蛋白质
4. D细胞中全部染色体的完整集合

What is a haploid cell?

1. AA cell with an extra chromosome
2. BA cell with two sets of chromosomes
3. CA cell with no nucleus
4. DA cell with one set of chromosomes

Salivary amylase begins the digestion of which nutrient in the mouth?

1. AFat
2. BProtein
3. CStarch
4. DCellulose

一名学生检验光照量如何影响菜豆植株的生长。哪一项应是控制变量？

1. A最后植株的高度
2. B实验的结论
3. C每株植物得到的光照量
4. D每株植物得到的水量

Sickle cell disease is caused by a single base change that replaces one amino acid in haemoglobin. What type of mutation is this?

1. AA frameshift mutation
2. BA silent mutation
3. CA nonsense mutation
4. DA missense mutation

Two populations of one species live on separate islands for many thousands of years. When brought together, they can no longer interbreed. What has happened?

1. AArtificial selection by humans
2. BSpeciation after geographic isolation
3. CHomeostasis in both populations
4. DHybrid vigour from crossbreeding

Redi placed meat in open jars and in jars covered with gauze. Maggots appeared only on meat that flies could reach. What did this show?

1. AFlies form from rotting meat, and then they lay eggs on fresh meat
2. BMaggots come from eggs laid by flies, not from the meat itself
3. CGauze produces chemicals that stop meat from rotting
4. DMeat turns into maggots when exposed to air