1.やさしい
How does a vaccine protect a person?
- AIt replaces the person's white blood cells with stronger ones
- BIt blocks the pathogen from entering the nose
- CIt kills all bacteria in the body straight away
- DIt trains the immune system with a harmless form of a pathogen
2.やさしい
What is the main job of the large central vacuole in a plant cell?
- AIt copies DNA before the cell divides
- BIt assembles proteins from amino acids
- CIt captures light energy for photosynthesis
- DIt stores water and keeps the cell firm
3.やさしい
Which element is found in all organic molecules?
- ASulfur
- BNitrogen
- CCarbon
- DPhosphorus
4.ふつう
A cut in the skin heals as new skin cells fill the wound. Which process produces these cells?
- ABinary fission
- BFertilisation
- CMeiosis
- DMitosis
5.ふつう
How does facilitated diffusion differ from active transport?
- AIt moves only water and no other substances
- BIt needs ATP and moves substances against their gradient
- CIt needs no energy and moves substances down their gradient
- DIt works without any membrane proteins
6.ふつう
Why do many plants close their stomata on hot, dry days?
- ATo speed up photosynthesis
- BTo reduce water loss
- CTo release more oxygen
- DTo take in more carbon dioxide
7.むずかしい
An mRNA reads AUG-UUU-GGC-UAA. How many amino acids are in the protein made from it?
- A3
- B12
- C2
- D4
8.むずかしい
Fertiliser washes from farmland into a lake. Algae grow rapidly, then die, and later many fish die. What is the main cause of the fish deaths?
- AThe fish eat too many algae and become ill
- BThe algae release carbon dioxide that poisons fish
- CBacteria decomposing the dead algae use up the oxygen
- DThe fertiliser is directly poisonous to fish
解答
- 1. D · It trains the immune system with a harmless form of a pathogen
- 2. D · It stores water and keeps the cell firm
- 3. C · Carbon
- 4. D · Mitosis
- 5. C · It needs no energy and moves substances down their gradient
- 6. B · To reduce water loss
- 7. A · 3
- 8. C · Bacteria decomposing the dead algae use up the oxygen
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