护理入学考试生物练习卷（附答案）

What is the main job of the nucleolus?

1. AIt releases energy from glucose for the nucleus
2. BIt digests worn-out parts of the cell
3. CIt stores water and salts for the nucleus
4. DIt makes ribosomal RNA and builds ribosome parts

What are the bacteria called that normally live on the skin and in the gut without causing disease?

1. APrions
2. BNormal flora
3. CPathogens
4. DVectors

What is a decomposer?

1. AAn organism that makes food from sunlight
2. BAn animal that eats only plants
3. CAn organism that breaks down dead material
4. DAn animal that hunts other animals

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

1. A0.0025 mg
2. B2500 mg
3. C25 mg
4. D250 mg

Human adult height varies across a smooth, continuous range rather than falling into a few separate groups. What is the best explanation?

1. AIt is controlled only by the environment
2. BIt is controlled by many genes and also affected by environment
3. CIt is an X-linked recessive trait
4. DIt is controlled by one gene with two alleles and full dominance

Dolly the sheep was cloned by putting the nucleus of an adult body cell into an egg cell whose nucleus had been removed. Whose nuclear DNA did Dolly have?

1. AThe sheep that carried the pregnancy
2. BThe sheep that gave the egg cell
3. CThe sheep that gave the body cell nucleus
4. DAn equal mix of all three sheep

Some snakes and whales have tiny remains of hip bones that are not used for walking. What do these structures suggest?

1. AThey were caused by a recent mutation
2. BThe bones are needed for swimming
3. CThey will grow legs in the future
4. DTheir ancestors had legs

Bacteria in a closed flask grow quickly at first, but the population then stops increasing. What is the main reason?

1. AThe bacteria stop dividing once they reach adult size
2. BThe flask becomes too cold for growth
3. CNutrients run out and waste products build up
4. DThe bacteria change into viruses after many divisions