Phiếu bài tập Sinh học cho kỳ thi đầu vào điều dưỡng có đáp án

What is an organism's genotype?

1. AThe environment in which it lives
2. BThe traits that can be seen or measured
3. CThe number of cells in its body
4. DThe alleles it carries for a trait

What is an antigen?

1. AA drug that kills viruses
2. BA molecule that the immune system sees as foreign
3. CA protein that carries oxygen
4. DA white blood cell that engulfs and digests bacteria

What is a neuron?

1. AA nerve cell that carries electrical signals
2. BA muscle cell that contracts
3. CA blood cell that carries oxygen around the body
4. DA bone cell that stores calcium

Why is the ABO blood group system an example of multiple alleles?

1. ABlood type is controlled by many separate genes
2. BThe gene is found on several chromosomes
3. CThere are three alleles of the gene in the population
4. DEach person carries three different alleles of the ABO gene

When most people in a community are vaccinated, people who cannot be vaccinated are also protected. Why?

1. AThe pathogen has too few hosts to spread easily
2. BVaccinated people make antibodies for others
3. CThe pathogen mutates into a harmless form
4. DThe vaccine spreads from person to person

Enzyme làm tăng tốc một phản ứng hóa học như thế nào?

1. ANó thêm năng lượng cho các sản phẩm
2. BNó làm giảm năng lượng hoạt hóa
3. CNó làm tăng nhiệt độ của tế bào
4. DNó bị tiêu hao như một chất phản ứng

Two genes lie very close together on the same chromosome. In a test cross, most offspring look like the parents instead of the expected 1:1:1:1 ratio. Why?

1. AThe genes are linked and are rarely separated by crossing over
2. BThe genes are on different chromosomes and assort independently
3. CBoth genes show incomplete dominance
4. DA frameshift mutation happened in both genes

Why are mutations in mitochondrial DNA passed on only from mothers to their children?

1. AThe zygote's mitochondria come from the egg
2. BOnly women have mitochondria in their cells
3. CMitochondrial DNA is on the X chromosome
4. DSperm cells contain no DNA at all