1.简单
What do centrioles do in an animal cell?
- AThey store the cell's digestive enzymes until they are needed
- BThey make lipids for the cell membrane
- CThey capture light for photosynthesis
- DThey help organise the spindle during cell division
2.简单
Which piece of equipment gives the most precise measurement of a liquid volume?
- AA Petri dish
- BA graduated cylinder
- CA test tube
- DA beaker
3.简单
高尔基体的主要工作是什么?
- A在细胞分裂前复制 DNA
- B通过细胞呼吸产生 ATP
- C控制哪些基因被开启
- D修饰和包装蛋白质
4.中等
Which body system works with the respiratory system to deliver oxygen to body cells?
- AThe urinary system
- BThe skeletal system
- CThe digestive system
- DThe circulatory system
5.中等
Where does the oxygen released by photosynthesis come from?
- AFrom water molecules that are split
- BFrom glucose that is broken down
- CFrom chlorophyll that is used up
- DFrom carbon dioxide molecules that are split
6.中等
How are photosynthesis and aerobic respiration related?
- ABoth release oxygen into the air
- BThe products of one are the reactants of the other
- CBoth happen only in animal cells, never in plant cells
- DBoth take place only in chloroplasts
7.困难
Two populations of one species live on separate islands for many thousands of years. When brought together, they can no longer interbreed. What has happened?
- AHybrid vigour from crossbreeding
- BSpeciation after geographic isolation
- CHomeostasis in both populations
- DArtificial selection by humans
8.困难
一种蛋白质由 150 个氨基酸组成。不计终止密码子,有多少个 mRNA 碱基编码它?
- A150
- B300
- C50
- D450
答案
- 1. D · They help organise the spindle during cell division
- 2. B · A graduated cylinder
- 3. D · 修饰和包装蛋白质
- 4. D · The circulatory system
- 5. A · From water molecules that are split
- 6. B · The products of one are the reactants of the other
- 7. B · Speciation after geographic isolation
- 8. D · 450
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