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

Что такое независимая переменная в эксперименте?

1. AФактор, одинаковый во всех группах
2. BФактор, который измеряют как результат
3. CГруппа, не получающая воздействия
4. DФактор, который исследователь намеренно изменяет

Which list gives the main taxonomic ranks from broadest to most specific?

1. ADomain, phylum, kingdom, order, class, genus, family, species
2. BSpecies, genus, family, order, class, phylum, kingdom, domain
3. CKingdom, domain, class, phylum, family, order, species, genus
4. DDomain, kingdom, phylum, class, order, family, genus, species

Which enzyme unwinds the DNA double helix and separates the two strands for copying?

1. AAmylase
2. BLipase
3. CHelicase
4. DLigase

Why do chromosomes condense into short, thick shapes before mitosis?

1. ASo they can be moved apart without tangling or breaking
2. BSo that they can leave through the nuclear pores
3. CSo that they can be copied more quickly
4. DSo that genes can be transcribed more easily

What is a chromosomal translocation?

1. AA piece of a chromosome is copied twice and stays in the same place
2. BA piece of one chromosome attaches to a non-matching chromosome
3. COne DNA base is replaced by another base
4. DA piece of a chromosome is flipped around in place

Why do many plants close their stomata on hot, dry days?

1. ATo take in more carbon dioxide
2. BTo release more oxygen
3. CTo reduce water loss
4. DTo speed up photosynthesis

Растение AaBb скрещивают с растением aabb. Гены наследуются независимо. Какое соотношение фенотипов ожидается среди потомства?

1. A1 : 1 : 1 : 1
2. B9 : 3 : 3 : 1
3. C1 : 2 : 1
4. D3 : 1

Why can O-negative red blood cells be given to patients of almost any blood type in an emergency?

1. AThey carry no A, B or RhD antigens
2. BThey have no haemoglobin to react with
3. CThey carry all of the A, B and RhD antigens
4. DTheir plasma contains anti-A and anti-B antibodies