Phiếu bài tập Sinh học cho kỳ thi đầu vào điều dưỡng có đáp án

Which bonds hold the two strands of a DNA double helix together?

1. ADisulfide bonds between the bases
2. BHydrogen bonds between the bases
3. CPeptide bonds between the sugars
4. DIonic bonds between the phosphates

Nguyên phân tạo ra gì?

1. ABốn tế bào con khác nhau về di truyền
2. BHai tế bào con giống hệt nhau về di truyền
3. CHai tế bào có số nhiễm sắc thể giảm một nửa
4. DMột tế bào có số nhiễm sắc thể gấp đôi

A solution has a pH of 3. How is it described?

1. AIsotonic
2. BAcidic
3. CBasic
4. DNeutral

The human arm, bat wing and whale flipper contain the same set of bones. What does this suggest?

1. AThey are the result of acquired traits
2. BThey evolved completely separately
3. CThey share a common ancestor
4. DThey have the same function

Nerve cells release chemical messengers (neurotransmitters) stored in vesicles. By which process are they released?

1. AOsmosis
2. BPhagocytosis
3. CEndocytosis
4. DExocytosis

Why can an electron microscope show more detail than a light microscope?

1. AElectron microscopes use stronger glass lenses
2. BElectron microscopes use living cells only
3. CElectrons have a much shorter wavelength than light
4. DElectrons are brighter than light

In an onion root tip, 90 of 100 cells are in interphase and 10 are in mitosis. If the whole cell cycle takes 20 hours, about how long does mitosis last?

1. A2 hours
2. B10 hours
3. C18 hours
4. D0,5 hours

Why are there usually far fewer top predators than herbivores in an ecosystem?

1. AHerbivores eat the young of top predators
2. BTop predators need less energy than herbivores
3. CTop predators reproduce faster than herbivores, so they die sooner
4. DEnergy is lost at each step, leaving little for the top level