护理入学考试生物练习卷（附答案）

What is an antigen?

1. AA white blood cell that engulfs and digests bacteria
2. BA molecule that the immune system sees as foreign
3. CA protein that carries oxygen
4. DA drug that kills viruses

What is a scientific law?

1. AA statement of what always happens under certain conditions
2. BA rule that scientists vote to accept
3. CAn explanation that has been proven wrong
4. DA guess about the cause of something that has not yet been tested

Which feature helps a sperm cell carry out its job?

1. AA flagellum for swimming
2. BChloroplasts for making food
3. CA large vacuole for storing water
4. DA cell wall for protection

Identical twins raised in different homes have different body weights. What does this show?

1. ABody weight is controlled by a single gene
2. BMutations happened in every cell of one twin
3. CThe twins must have different genotypes for body weight genes
4. DThe phenotype depends on environment as well as genotype

正常的人类卵细胞含有多少条染色体？

1. A22
2. B23
3. C92
4. D46

Which DNA bases are purines?

1. AAdenine and thymine
2. BCytosine and guanine
3. CAdenine and guanine
4. DCytosine and thymine

在细胞水平上，癌症的根本原因是什么？

1. A细胞完全停止分裂并死亡
2. B细胞失去全部线粒体
3. C细胞周期基因的突变导致不受控制的分裂
4. D细菌进入细胞核，用自己的 DNA 取代细胞自身的 DNA

Two plants are crossed, and about half of the offspring show the dominant trait and half show the recessive trait. What are the most likely genotypes of the parents?

1. AHomozygous dominant × heterozygous
2. BHeterozygous × homozygous recessive
3. CHomozygous dominant × homozygous recessive
4. DHeterozygous × heterozygous