护理入学考试生物练习卷（附答案）

What are restriction enzymes?

1. AEnzymes that copy RNA into DNA
2. BEnzymes that join amino acids into proteins
3. CEnzymes that digest fats in the intestine
4. DEnzymes that cut DNA at specific base sequences

What are cilia?

1. AShort hair-like projections that beat in waves
2. BFolds of the inner mitochondrial membrane that make ATP
3. COpenings in the nuclear envelope
4. DSmall round sacs that hold digestive enzymes

What is a chromosome?

1. AA strand of RNA that leaves the nucleus
2. BA single gene that codes for one protein
3. CA long DNA molecule, packed with proteins, carrying many genes
4. DA small organelle in the cytoplasm that makes ATP for the cell

In a food chain, producers hold 10 000 units of energy. Roughly how much is passed on to the primary consumers?

1. AAbout 10 000 units
2. BAbout 10 units
3. CAbout 5000 units
4. DAbout 1000 units

Why is water good at dissolving salts and sugars?

1. AIts molecules are nonpolar
2. BIts molecules are polar
3. CIt contains carbon atoms
4. DIt has a very low boiling point

科学理论与假设有何不同？

1. A理论是单个实验的结果
2. B它是得到大量经过检验的证据支持的广泛解释
3. C理论永远不会因新数据而改变
4. D理论是尚未检验的猜测

A diploid cell contains 10 units of DNA in G1. How many units are in each cell at the end of meiosis II?

1. A20 units
2. B2.5 units
3. C5 units
4. D10 units

A single-celled organism has a nucleus, no cell wall and swims using cilia. In which group is it best placed?

1. APlants
2. BProtists
3. CFungi
4. DBacteria