1.やさしい
DNA belongs to which group of biological molecules?
- ACarbohydrates
- BLipids
- CProteins
- DNucleic acids
2.やさしい
固体から直接気体への変化を何と呼ぶか。
- A凝縮
- B昇華
- C凝華
- D融解
3.やさしい
What is the normal pH range of human arterial blood?
- A7.35 to 7.45
- B7.85 to 7.95
- C7.00 to 7.10
- D6.35 to 6.45
4.ふつう
How does a mixture of iron filings and sulfur powder differ from the compound iron sulfide?
- AThe mixture has a fixed ratio of iron to sulfur
- BThe mixture is formed by a chemical reaction between the two elements
- CThe mixture can be separated physically, for example with a magnet
- DThe compound keeps the magnetic properties of iron
5.ふつう
How many lone (non-bonding) pairs of electrons are on the oxygen atom in a water molecule?
- A1
- B4
- C0
- D2
6.ふつう
A red blood cell is placed in a concentrated (hypertonic) salt solution. What happens?
- AWater leaves the cell, which shrinks
- BThe cell stays the same size and shape
- CWater enters the cell, which swells and may burst
- DSalt leaves the cell, which swells
7.むずかしい
Magnesium burns as 2Mg + O₂ → 2MgO. What mass of MgO (40 g/mol) forms from 48 g of Mg (24 g/mol)?
- A160 g
- B48 g
- C40 g
- D80 g
8.むずかしい
ある試料に水の分子が 3.01 × 10²³ 個含まれる。何 mol か。
- A2 mol
- B0.5 mol
- C1.81 mol
- D3.01 mol
解答
- 1. D · Nucleic acids
- 2. B · 昇華
- 3. A · 7.35 to 7.45
- 4. C · The mixture can be separated physically, for example with a magnet
- 5. D · 2
- 6. A · Water leaves the cell, which shrinks
- 7. D · 80 g
- 8. B · 0.5 mol
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