Biology for nursing entrance exams worksheet with answers

What is a bacteriophage?

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

Why is a virus unable to reproduce on its own?

1. AIt needs the machinery of a host cell to make copies
2. BIt divides only by meiosis
3. CIt reproduces only in sunlight
4. DIt has no genetic material of any kind, neither DNA nor RNA

What are the three parts of a nucleotide?

1. AA glycerol, a phosphate and a fatty acid
2. BA carboxyl group, a base and a lipid
3. CAn amino group, a sugar and a fatty acid
4. DA phosphate, a sugar and a nitrogen base

How do bacteria usually reproduce?

1. ABy budding off viruses
2. BBy meiosis
3. CBy binary fission
4. DBy forming seeds

When does crossing over between homologous chromosomes happen?

1. AIn anaphase of mitosis
2. BIn the S phase of interphase
3. CIn prophase I of meiosis
4. DIn telophase II of meiosis

Nerve cells release chemical messengers (neurotransmitters) stored in vesicles. By which process are they released?

1. AOsmosis
2. BExocytosis
3. CPhagocytosis
4. DEndocytosis

A plant that is AaBb is crossed with an aabb plant. The genes assort independently. What phenotype ratio is expected among the offspring?

1. A1 : 1 : 1 : 1
2. B9 : 3 : 3 : 1
3. C3 : 1
4. D1 : 2 : 1

Two parents without a disease have a child with the disease. Assuming a single gene, what is the most likely explanation?

1. AThe trait is dominant and both parents are affected
2. BThe trait is recessive and both parents are carriers
3. CThe child inherited the trait only from the father's Y chromosome
4. DThe trait is dominant and one parent is homozygous