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

Which enzyme adds new nucleotides to build a new DNA strand?

1. ADNA polymerase
2. BHelicase
3. CPepsin
4. DRNA polymerase

Почему вирус не может размножаться самостоятельно?

1. AОн делится только путём мейоза
2. BОн размножается только на солнечном свете
3. CЕму нужен аппарат клетки-хозяина для создания копий
4. DУ него вообще нет генетического материала — ни ДНК, ни РНК

Which feature helps a sperm cell carry out its job?

1. AA flagellum for swimming
2. BChloroplasts for making food
3. CA cell wall for protection
4. DA large vacuole for storing water

Red-green colour blindness is X-linked recessive. A colour-blind woman (XᵇXᵇ) has children with a man with normal colour vision (XᴮY). What fraction of their sons is expected to be colour-blind?

1. AOne quarter
2. BOne half
3. CAll
4. DNone

Каково основное строение вируса?

1. AЯдро, окружённое клеточной стенкой
2. BГенетический материал внутри белковой оболочки
3. CЦепь аминокислот без какой-либо ДНК или РНК
4. DОдна клетка с рибосомами и митохондриями

Which list puts these human energy sources in order from fastest to use to longest-lasting store?

1. AATP, then fat, then glycogen
2. BATP, then glycogen, then fat
3. CGlycogen, then ATP, then fat
4. DFat, then glycogen, then ATP

Bacteria from hot springs have enzymes that work best at about 80 °C, while most human enzymes work best near 37 °C. What is the best explanation?

1. ATheir enzymes have structures that stay stable at high temperatures
2. BTheir enzymes are made of lipids, not proteins
3. CHigh temperature never affects any enzyme
4. DTheir enzymes do not have an active site, so heat cannot affect them

Why is ATP described as an energy carrier rather than a long-term energy store?

1. AATP contains no energy in its bonds, so it cannot be stored
2. BATP is stored in large amounts in fat tissue
3. CATP can be made only in plants
4. DCells hold only a little and constantly recycle it from ADP