Биология для вступительных экзаменов на сестринские программы: лист заданий с ответами

What is an antigen?

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

What does the enzyme DNA ligase do?

1. AIt joins pieces of DNA together
2. BIt unwinds the DNA double helix
3. CIt cuts DNA at specific sites
4. DIt makes RNA from a DNA template

In the scientific name Homo sapiens, what does Homo name?

1. AThe family
2. BThe genus
3. CThe kingdom
4. DThe species

What is the difference between an antiseptic and a disinfectant?

1. AAntiseptics are used on objects and floors; disinfectants are used on skin
2. BAntiseptics are used on living tissue; disinfectants are used on objects
3. CAntiseptics are antibiotics; disinfectants are vaccines
4. DAntiseptics kill all spores; disinfectants kill none

How can bacteria pass antibiotic-resistance genes directly to other bacteria?

1. ABy mitosis, sharing copies of their chromosomes with neighbours
2. BBy conjugation, transferring plasmids through a pilus
3. CBy meiosis, forming gametes with new alleles
4. DBy osmosis, moving genes in water

Which DNA bases are purines?

1. ACytosine and thymine
2. BAdenine and thymine
3. CAdenine and guanine
4. DCytosine and guanine

A solution contains 5 mg of a substance in every millilitre. How many milligrams are in 0,02 L of the solution?

1. A100 mg
2. B0,1 mg
3. C1000 mg
4. D10 mg

Ученик вносит удобрение под 2 томата, а под 2 других — нет. Удобренные растения вырастают выше. В чём главная слабость вывода о том, что удобрение увеличивает рост?

1. AУдобрение следовало внести под все четыре растения
2. BВысоту нельзя точно измерить
3. CРазмер выборки слишком мал, чтобы исключить случайность
4. DНе было независимой переменной