1.やさしい
A solution has a pH of 3. How is it described?
- ANeutral
- BBasic
- CIsotonic
- DAcidic
2.やさしい
生きているとみなされる最小の単位はどれか。
- A原子
- B組織
- C細胞
- D分子
3.やさしい
What are homologous chromosomes?
- ATwo chromosomes that are always the X and the Y
- BChromosomes that are found only in gametes
- CA matching pair, one from each parent, that carry the same genes
- DTwo identical copies of one chromosome made when DNA is replicated
4.ふつう
Why are stains such as iodine or methylene blue added to cells on a microscope slide?
- ATo make the cells divide
- BTo keep the cells alive for longer
- CTo make structures easier to see
- DTo make the cells larger
5.ふつう
During childbirth, pressure on the cervix causes oxytocin release, which causes stronger contractions and more pressure. What kind of control is this?
- ANatural selection
- BNegative feedback
- CHomeostatic balance
- DPositive feedback
6.ふつう
In a food chain, which organisms are the producers?
- AAnimals that eat only plants, such as rabbits and deer
- BPlants and algae that make food by photosynthesis
- CPredators at the top of the chain
- DFungi that break down dead material
7.むずかしい
Plants in waterlogged soil take up fewer mineral ions, even when the ions are plentiful. What is the best explanation?
- AMineral ions only enter by osmosis, and osmosis stops in wet soil
- BWaterlogged roots carry out more photosynthesis
- CWater dilutes the ions so much that roots cannot detect them
- DRoot cells lack oxygen, so less ATP is made for active transport
8.むずかしい
A human body cell has 46 chromosomes in G1. How many chromatids does it have at metaphase of mitosis?
- A92
- B184
- C46
- D23
解答
- 1. D · Acidic
- 2. C · 細胞
- 3. C · A matching pair, one from each parent, that carry the same genes
- 4. C · To make structures easier to see
- 5. D · Positive feedback
- 6. B · Plants and algae that make food by photosynthesis
- 7. D · Root cells lack oxygen, so less ATP is made for active transport
- 8. A · 92
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