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

Which group of biomolecules forms the basic bilayer of the cell membrane and also stores long-term energy?

1. ANucleic acids
2. BCarbohydrates
3. CLipids
4. DProteins

What is true of a recessive allele?

1. AIt is found only on the X chromosome
2. BIt is always harmful to the organism
3. CIts trait shows only when two copies are present
4. DIts trait shows whenever one copy is present

What are homologous chromosomes?

1. AA matching pair, one from each parent, that carry the same genes
2. BTwo chromosomes that are always the X and the Y
3. CChromosomes that are found only in gametes
4. DTwo identical copies of one chromosome made when DNA is replicated

Когда в клеточном цикле происходит копирование ДНК?

1. AВ S-фазе интерфазы
2. BТолько во время мейоза II
3. CВо время метафазы митоза
4. DВо время цитокинеза

What happens to a protein when it is denatured?

1. AIt becomes more active than before
2. BIt turns into a carbohydrate
3. CIt loses its 3D shape but keeps its amino acid sequence
4. DIt loses some of its amino acids but keeps its folded shape

Why do many plants close their stomata on hot, dry days?

1. ATo reduce water loss
2. BTo speed up photosynthesis
3. CTo take in more carbon dioxide
4. DTo release more oxygen

An inhibitor binds to an enzyme away from the active site and changes the enzyme's shape. Adding more substrate does not restore the rate. What type of inhibition is this?

1. ANoncompetitive inhibition
2. BSubstrate saturation
3. CCompetitive inhibition
4. DDenaturation by heat

The lion is Panthera leo, the tiger is Panthera tigris and the house cat is Felis catus. Which two are most closely related?

1. AThe lion and the house cat
2. BThe tiger and the house cat
3. CThe lion and the tiger
4. DAll three are equally related