1.简单
What do centrioles do in an animal cell?
- AThey capture light for photosynthesis
- BThey help organise the spindle during cell division
- CThey store the cell's digestive enzymes until they are needed
- DThey make lipids for the cell membrane
2.简单
What is the correct order of the phases of mitosis?
- AProphase, anaphase, metaphase, telophase
- BMetaphase, prophase, anaphase, telophase
- CTelophase, anaphase, metaphase, prophase
- DProphase, metaphase, anaphase, telophase
3.简单
用哪种仪器可以看到单个细胞?
- A望远镜
- B温度计
- C显微镜
- D测声音的光谱仪
4.中等
How can bacteria pass antibiotic-resistance genes directly to other bacteria?
- ABy osmosis, moving genes in water
- BBy mitosis, sharing copies of their chromosomes with neighbours
- CBy conjugation, transferring plasmids through a pilus
- DBy meiosis, forming gametes with new alleles
5.中等
把一个红细胞放入很咸的(高渗)溶液中。会发生什么?
- A水离开细胞,细胞皱缩
- B盐进入细胞,细胞膨胀
- C水进入细胞,细胞破裂
- D没有变化,因为盐不能通过
6.中等
Which statement best describes biological evolution?
- AMovement of animals to a new habitat each year
- BGrowth of an organism from a single zygote to a fully grown adult
- CChange in the body of one organism during its lifetime
- DChange in the inherited traits of a population over generations
7.困难
At dawn, a plant shows no overall uptake or release of oxygen or carbon dioxide. What is the best explanation?
- AIts stomata are permanently closed at dawn
- BIt has stopped both photosynthesis and respiration until it is light
- CIt only respires at dawn
- DIts rate of photosynthesis equals its rate of respiration
8.困难
At 100× total magnification, the field of view of a microscope is 2 mm wide. What is its width at 400×?
- A0.2 mm
- B8 mm
- C2 mm
- D0.5 mm
答案
- 1. B · They help organise the spindle during cell division
- 2. D · Prophase, metaphase, anaphase, telophase
- 3. C · 显微镜
- 4. C · By conjugation, transferring plasmids through a pilus
- 5. A · 水离开细胞,细胞皱缩
- 6. D · Change in the inherited traits of a population over generations
- 7. D · Its rate of photosynthesis equals its rate of respiration
- 8. D · 0.5 mm
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