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

How many strands does an RNA molecule usually have?

1. AFour
2. BTwo
3. CThree
4. DOne

Which type of microscope is needed to see a virus?

1. AAn electron microscope
2. BA light microscope
3. CA magnifying glass
4. DA dissecting microscope

What is an antigen?

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

Why does PCR use a DNA polymerase taken from bacteria that live in hot springs?

1. AIt works only in the dark, like the bacteria it comes from
2. BIt copies RNA as well as DNA
3. CIt makes the DNA strands stick together
4. DIt survives the high temperatures used to separate the strands

Что такое мутация?

1. AНормальное копирование ДНК перед делением
2. BИзменение числа клеток в ткани
3. CИзменение последовательности оснований в ДНК
4. DСпаривание гомологичных хромосом

A student's hypothesis is "Salt water slows the growth of bean seedlings." Which is a prediction based on it?

1. ASeedlings given plain water will die within a week
2. BSalt water is made of sodium chloride and water
3. CSeedlings given salt water will grow less than those given plain water
4. DBean seedlings need sunlight and water to grow well

Two parents are both AaBbCc, and the three genes assort independently. What is the probability that a child is aabbcc?

1. A1/64
2. B3/64
3. C1/8
4. D1/16

Some chemotherapy drugs stop spindle fibres from forming. Why do they often cause hair loss and damage to the gut lining?

1. AThese tissues are made only of haploid cells
2. BThese cells divide by meiosis instead of mitosis
3. CThese cells have no mitochondria
4. DThese tissues also contain rapidly dividing cells