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

What is a karyotype?

1. AA list of all the proteins that a cell makes during its life
2. BA diagram of a family's inheritance pattern
3. CA picture of a cell's chromosomes arranged in pairs by size
4. DA map of the organelles inside a cell

Which of these diseases is caused by a virus?

1. ATuberculosis
2. BAthlete's foot
3. CInfluenza
4. DMalaria

What does the enzyme DNA ligase do?

1. AIt unwinds the DNA double helix
2. BIt joins pieces of DNA together
3. CIt cuts DNA at specific sites
4. DIt makes RNA from a DNA template

In gel electrophoresis, why does DNA move towards the positive electrode?

1. ADNA has no charge and moves at random
2. BDNA is pulled by gravity through the gel
3. CDNA has a positive charge from the nitrogen bases it contains
4. DDNA has a negative charge from its phosphate groups

What is the difference between an antiseptic and a disinfectant?

1. AAntiseptics are used on living tissue; disinfectants are used on objects
2. BAntiseptics are antibiotics; disinfectants are vaccines
3. CAntiseptics are used on objects and floors; disinfectants are used on skin
4. DAntiseptics kill all spores; disinfectants kill none

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

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

Почему большинство клеток очень малы?

1. AКрупные клетки не могут содержать митохондрии
2. BУ малых клеток высокое отношение площади поверхности к объёму
3. CМалым клеткам не нужен кислород
4. DМалые клетки содержат больше ДНК, чем крупные

У обоих родителей группа крови O. Какую группу крови могут иметь их дети?

1. AТолько группу O
2. BТолько группу AB
3. CЛюбую из четырёх групп
4. DГруппу A или группу O