护理入学考试生物练习卷（附答案）

What is a bacteriophage?

1. AA virus that infects bacteria
2. BA white cell that eats bacteria
3. CA bacterium that infects viruses
4. DA fungus that kills bacteria

What does transfer RNA (tRNA) do?

1. AIt carries the code out of the nucleus
2. BIt brings amino acids to the ribosome
3. CIt joins two DNA strands together
4. DIt copies DNA in the nucleus

In biology, what is a clone?

1. AAn offspring of two different parents
2. BAn organism that carries genes from two different species
3. CA cell with an extra chromosome
4. DA genetically identical copy of an organism, cell or gene

A tablet contains 2.5 g of a substance. How many milligrams is this?

1. A2500 mg
2. B25 mg
3. C250 mg
4. D0.0025 mg

What is the difference between an epidemic and a pandemic?

1. AA pandemic affects only one town
2. BAn epidemic affects the whole world at once
3. CAn epidemic is caused only by bacteria
4. DA pandemic spreads across many countries or continents

Yeast in bread dough breaks down sugar without oxygen. What does it produce?

1. AEthanol and carbon dioxide
2. BLactic acid and carbon dioxide
3. COxygen and water
4. DGlucose and oxygen

Scientists put a human gene into bacteria to make a protein. Why do they use a DNA copy made from the mature mRNA instead of the gene taken straight from human DNA?

1. ABacteria have no ribosomes
2. BBacteria cannot remove introns
3. CBacteria cannot read human codons
4. DHuman DNA has no start codons

血型为 A 型（基因型 Iᴬi）的母亲和血型为 B 型（Iᴮi）的父亲生育子女。可能出现哪些血型？

1. A只有 AB
2. BA、B、AB 和 O
3. C只有 A、B 和 AB
4. D只有 A 和 B