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

What is a sister chromatid?

1. AOne of the two sex chromosomes
2. BA small ring of DNA found in bacteria
3. COne of two identical copies of a chromosome joined at the centromere
4. DA chromosome that is inherited from the mother only, never the father

Which sugar is found in DNA?

1. ADeoxyribose
2. BRibose
3. CGlucose
4. DFructose

Что такое ген?

1. AПолный набор всех хромосом клетки
2. BБелок, копирующий ДНК перед делением клетки
3. CТип клетки, несущей наследственные признаки
4. DУчасток ДНК, кодирующий продукт, например белок

Why can an electron microscope show more detail than a light microscope?

1. AElectrons have a much shorter wavelength than light
2. BElectrons are brighter than light
3. CElectron microscopes use stronger glass lenses
4. DElectron microscopes use living cells only

In which phase of mitosis do the chromosomes condense and the nuclear envelope break down?

1. AAnaphase
2. BMetaphase
3. CTelophase
4. DProphase

What is meant by independent assortment in meiosis?

1. AHomologous pairs line up randomly, so gametes get different mixes of chromosomes
2. BDNA is copied separately in each chromosome
3. CSister chromatids stay joined until the end of meiosis, so all gametes are identical
4. DAll chromosomes from the mother go into the same gamete

At 100× total magnification, the field of view of a microscope is 2 mm wide. What is its width at 400×?

1. A8 mm
2. B2 mm
3. C0,5 mm
4. D0,2 mm

A breastfed baby receives antibodies from its mother's milk. Why does this protection last only a short time?

1. AThe baby's stomach makes the antibodies more active
2. BThe baby did not make these antibodies and forms no memory cells
3. CThe antibodies from breast milk attack the baby's own red blood cells
4. DThe antibodies turn into memory cells after a few weeks