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

What does transfer RNA (tRNA) do?

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

What is a neuron?

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

What are the parts of a triglyceride (a fat molecule)?

1. ATwo glycerols and one fatty acid
2. BOne glycerol and three fatty acids
3. CThree glucose units and one phosphate
4. DOne amino acid and three fatty acids

Что такое кодон?

1. AУчасток хромосомы, к которому во время митоза прикрепляются нити веретена
2. BГруппа из трёх оснований мРНК, кодирующая одну аминокислоту
3. CОдно основание, кодирующее белок
4. DБелок, запускающий транскрипцию

What causes cohesion between water molecules?

1. AMagnetic forces between hydrogen atoms
2. BHydrogen bonds between neighbouring molecules
3. CCovalent bonds between neighbouring molecules
4. DIonic bonds between oxygen atoms

A greenhouse is warm and brightly lit, but the air has very little carbon dioxide. What is most likely limiting the rate of photosynthesis?

1. AThe carbon dioxide concentration
2. BThe temperature
3. CThe number of stomata
4. DThe light intensity in the greenhouse

Why can standard DNA profiling not tell identical twins apart?

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

Why does cooking oil not mix with water?

1. AWater molecules are nonpolar and avoid each other
2. BOil is denser than water and sinks
3. COil molecules are nonpolar and cannot form hydrogen bonds with water
4. DOil molecules are polar and repel the charged ends of water molecules