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

Which sex chromosomes does a typical human male have?

1. AYY
2. BXY
3. CX only
4. DXX

What is a heterotroph?

1. AAn organism with no cells
2. BAn organism that makes its own food by photosynthesis
3. CAn organism that lives only in water
4. DAn organism that gets its food from other organisms

What does transfer RNA (tRNA) do?

1. AIt copies DNA in the nucleus
2. BIt carries the code out of the nucleus
3. CIt joins two DNA strands together
4. DIt brings amino acids to the ribosome

Why is DNA replication called semiconservative?

1. AEach new strand is a random mix of old and new pieces
2. BEach new DNA molecule has one old strand and one new strand
3. CThe old DNA molecule is kept whole, and a completely new one is made
4. DOnly half of the DNA is copied each time

What causes cohesion between water molecules?

1. AHydrogen bonds between neighbouring molecules
2. BIonic bonds between oxygen atoms
3. CMagnetic forces between hydrogen atoms
4. DCovalent bonds between neighbouring molecules

Nearly all cells in a person's body contain the same DNA. Why do nerve cells and muscle cells look and work so differently?

1. AEach cell type has a different set of chromosomes
2. BNerve cells have lost the genes for muscle proteins
3. CMuscle cells have extra DNA from mitochondria
4. DDifferent genes are switched on in each type of cell

Why can standard DNA profiling not tell identical twins apart?

1. AIdentical twins have no non-coding DNA
2. BIdentical twins come from one zygote and have the same DNA
3. CTwins always share the same fingerprints on their hands
4. DOnly one twin inherits the father's DNA

Какой тип графика лучше всего показывает изменение температуры пациента за 24 часа?

1. AРешётка Пеннета
2. BКруговая диаграмма
3. CЛинейный график
4. DПищевая сеть