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

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

1. AHelicase
2. BDNA polymerase
3. CPepsin
4. DRNA polymerase

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

1. ALipase
2. BHelicase
3. CLigase
4. DAmylase

Which gas do plants take in from the air for photosynthesis?

1. AOxygen
2. BCarbon dioxide
3. CHydrogen
4. DNitrogen

A person catches chickenpox once and does not usually become ill with it again. Why?

1. AThe virus stays in the blood and kills new viruses
2. BMemory cells give a faster, stronger response the next time
3. CThe skin becomes thicker after the first infection
4. DAntibodies from the first infection turn into new viruses

Salivary amylase begins the digestion of which nutrient in the mouth?

1. ACellulose
2. BFat
3. CStarch
4. DProtein

Why can small nonpolar molecules cross the cell membrane easily while ions cannot?

1. AThe bilayer's core is made of hydrophobic tails
2. BThe membrane carries a strong positive charge
3. CThe membrane is made mostly of long carbohydrate chains
4. DIons are larger than most membrane proteins

A patient breathes very slowly, so carbon dioxide builds up in the blood. What happens to the blood pH, and why?

1. AIt falls, because CO₂ forms carbonic acid in the blood
2. BIt rises, because CO₂ removes hydrogen ions
3. CIt stays the same, because CO₂ does not dissolve in blood
4. DIt rises, because CO₂ is a base

A person's body temperature starts to fall in a cold room. Which responses help bring it back up?

1. ASweating and widening of blood vessels in the skin
2. BFaster breathing and more urine production
3. CSlower heart rate and less muscle activity
4. DShivering and narrowing of blood vessels in the skin