1.やさしい
Which enzyme unwinds the DNA double helix and separates the two strands for copying?
- AAmylase
- BLipase
- CLigase
- DHelicase
2.やさしい
What is an organism's genotype?
- AThe alleles it carries for a trait
- BThe number of cells in its body
- CThe environment in which it lives
- DThe traits that can be seen or measured
3.やさしい
How many strands does an RNA molecule usually have?
- ATwo
- BThree
- CFour
- DOne
4.ふつう
Why do many plants close their stomata on hot, dry days?
- ATo reduce water loss
- BTo take in more carbon dioxide
- CTo speed up photosynthesis
- DTo release more oxygen
5.ふつう
What is the role of cholesterol in animal cell membranes?
- AIt forms a rigid wall around the cell
- BIt keeps membrane fluidity stable as temperature changes
- CIt stores the cell's genetic information
- DIt carries glucose molecules across the membrane into the cell
6.ふつう
グラム染色で、グラム陽性菌が紫に染まるのはなぜか。
- Aクロロフィルをもつから
- B薄い細胞壁が、脂質に富む外膜で覆われているから
- C細胞壁がまったくないから
- D厚いペプチドグリカンの細胞壁が紫の色素を保持するから
7.むずかしい
A plant cell is placed in a strong salt solution. Its membrane and cytoplasm pull away from the cell wall. What is this called?
- APlasmolysis
- BCrenation
- CLysis
- DTurgor
8.むずかしい
赤血球を、細胞質と溶質濃度が同じ溶液に入れた。何が起こるか。
- A水分子が、どちらの方向にも膜を通らなくなる
- B水の正味の移動はなく、細胞は形を保つ
- C水が出ていき、細胞が縮む
- D細胞が膨らんで破裂する
解答
- 1. D · Helicase
- 2. A · The alleles it carries for a trait
- 3. D · One
- 4. A · To reduce water loss
- 5. B · It keeps membrane fluidity stable as temperature changes
- 6. D · 厚いペプチドグリカンの細胞壁が紫の色素を保持するから
- 7. A · Plasmolysis
- 8. B · 水の正味の移動はなく、細胞は形を保つ
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