护理入学考试生物练习卷（附答案）

Which enzyme unwinds the DNA double helix and separates the two strands for copying?

1. AHelicase
2. BAmylase
3. CLigase
4. DLipase

什么是表型？

1. A生物体为某个基因携带的一对等位基因
2. B基因中碱基的排列顺序
3. C配子中的染色体数目
4. D可观察到的性状，例如眼睛的颜色

在 DNA 中，腺嘌呤总是与哪种碱基配对？

1. A胸腺嘧啶
2. B尿嘧啶
3. C鸟嘌呤
4. D胞嘧啶

A cut in the skin heals as new skin cells fill the wound. Which process produces these cells?

1. AFertilisation
2. BMeiosis
3. CMitosis
4. DBinary fission

How does cytokinesis differ between animal cells and plant cells?

1. AAnimal cells pinch in with a furrow; plant cells build a cell plate
2. BOnly plant cells carry out cytokinesis
3. CAnimal cells build a cell plate; plant cells pinch in with a furrow
4. DOnly animal cells carry out cytokinesis

What is meant by independent assortment in meiosis?

1. ADNA is copied separately in each chromosome
2. BAll chromosomes from the mother go into the same gamete
3. CSister chromatids stay joined until the end of meiosis, so all gametes are identical
4. DHomologous pairs line up randomly, so gametes get different mixes of chromosomes

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. CHybrid vigour from crossbreeding
4. DHomeostasis in both populations

一种蛋白质由 150 个氨基酸组成。不计终止密码子，有多少个 mRNA 碱基编码它？

1. A300
2. B150
3. C50
4. D450