1.Easy
What is a model in science?
- AA single measurement from an experiment
- BAn exact copy that has no limitations
- CThe control group of a study
- DA simplified representation of a real system
2.Easy
What is the job of the capsule found around some bacteria?
- AIt holds the bacterium's main chromosome
- BIt is used to swim through liquids
- CIt helps the bacterium make energy by photosynthesis
- DIt protects the cell, for example from white blood cells
3.Easy
Which structure is found in plant cells but not in animal cells?
- AMitochondrion
- BCell wall
- CCell membrane
- DRibosome
4.Medium
How can bacteria pass antibiotic-resistance genes directly to other bacteria?
- ABy conjugation, transferring plasmids through a pilus
- BBy osmosis, moving genes in water
- CBy meiosis, forming gametes with new alleles
- DBy mitosis, sharing copies of their chromosomes with neighbours
5.Medium
A seedling is 4 cm tall at week 1, 8 cm at week 2, 12 cm at week 3 and 16 cm at week 4. If the trend continues, how tall will it be at week 6?
- A32 cm
- B20 cm
- C18 cm
- D24 cm
6.Medium
During which division of meiosis do homologous chromosomes separate?
- ANeither, because they separate in mitosis
- BMeiosis II
- CBoth meiosis I and meiosis II
- DMeiosis I
7.Hard
A karyotype shows 45 chromosomes, with a single X chromosome and no Y. Which condition is this?
- ATurner syndrome
- BA typical male karyotype
- CDown syndrome
- DKlinefelter syndrome
8.Hard
Fresh liver is dropped into hydrogen peroxide and bubbles form quickly. Boiled liver gives no bubbles. What is the best conclusion?
- AThe bubbles are carbon dioxide from respiration
- BBoiled liver contains more hydrogen peroxide than fresh liver
- CHydrogen peroxide is broken down only by heat
- DLiver contains an enzyme that is destroyed by boiling
Answer key
- 1. D · A simplified representation of a real system
- 2. D · It protects the cell, for example from white blood cells
- 3. B · Cell wall
- 4. A · By conjugation, transferring plasmids through a pilus
- 5. D · 24 cm
- 6. D · Meiosis I
- 7. A · Turner syndrome
- 8. D · Liver contains an enzyme that is destroyed by boiling
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