护理入学考试生物练习卷（附答案）

Which organelle makes lipids and helps break down drugs and toxins in liver cells?

1. ACentriole
2. BRough endoplasmic reticulum
3. CNucleolus
4. DSmooth endoplasmic reticulum

What are round (spherical) bacteria called?

1. AVibrios
2. BBacilli
3. CCocci
4. DSpirilla

In an enzyme reaction, what is the substrate?

1. AThe substance that the enzyme acts on
2. BThe gene that codes for the enzyme
3. CThe product released at the end
4. DThe part of the enzyme that changes shape

Why are G–C base pairs held together more strongly than A–T pairs?

1. AG and C are both purines, so they fit more tightly
2. BG–C pairs are joined by strong covalent bonds instead of hydrogen bonds
3. CA–T pairs are found only in RNA
4. DG–C pairs form three hydrogen bonds, and A–T pairs form two

Which DNA bases are purines?

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

What do nitrogen-fixing bacteria do?

1. AThey convert nitrogen gas into compounds that plants can use
2. BThey turn carbon dioxide into sugar
3. CThey release nitrogen gas from dead organisms into the air
4. DThey break down proteins into glucose

下列哪项正确地比较了有丝分裂和减数分裂？

1. A有丝分裂有两次分裂，产生四个相同的细胞
2. B减数分裂产生两个与亲代相同的细胞
3. C减数分裂有两次分裂，产生四个遗传上不同的单倍体细胞
4. D两者都产生染色体数目为亲代细胞一半的配子，用于生殖

一项研究发现，冰淇淋销量较多的城镇溺水事故也较多。最好的结论是什么？

1. A数据一定有误，因为这样的联系根本说不通
2. B两者相关，也许因为两者都在炎热天气中增加
3. C吃冰淇淋导致人们溺水
4. D溺水导致人们购买冰淇淋