1.Easy
On which structures are proteins assembled from amino acids?
- ACentrioles
- BLysosomes
- CRibosomes
- DVacuoles
2.Easy
Which substances are used up in aerobic cellular respiration?
- AGlucose and carbon dioxide
- BCarbon dioxide and water
- COxygen and water
- DGlucose and oxygen
3.Easy
What is the job of messenger RNA (mRNA)?
- AIt carries the genetic code from DNA to the ribosomes
- BIt stores genetic information in the nucleus permanently
- CIt carries amino acids to the ribosomes
- DIt forms the main structure of the ribosome
4.Medium
What do the spindle fibres do during cell division?
- AThey make the new nuclear envelope
- BThey attach to chromosomes and move them to the poles
- CThey digest the old cell membrane
- DThey copy the DNA of each chromosome before the cell divides
5.Medium
During which phase of mitosis are the sister chromatids pulled to opposite poles?
- AMetaphase
- BProphase
- CAnaphase
- DInterphase
6.Medium
Yeast in bread dough breaks down sugar without oxygen. What does it produce?
- AGlucose and oxygen
- BLactic acid and carbon dioxide
- CEthanol and carbon dioxide
- DOxygen and water
7.Hard
Pasteur boiled broth in swan-neck flasks. The broth stayed clear until the neck was broken off, when it soon became cloudy. What did this show?
- AAir alone, without microbes, spoils broth
- BMicrobes come from the air, not from the broth itself
- CSwan-neck flasks produce chemicals that kill bacteria
- DBoiling makes broth produce new microbes
8.Hard
Why are most cells very small?
- ASmall cells have a high surface-area-to-volume ratio
- BSmall cells contain more DNA than large cells
- CLarge cells cannot contain mitochondria
- DSmall cells do not need oxygen
Answer key
- 1. C · Ribosomes
- 2. D · Glucose and oxygen
- 3. A · It carries the genetic code from DNA to the ribosomes
- 4. B · They attach to chromosomes and move them to the poles
- 5. C · Anaphase
- 6. C · Ethanol and carbon dioxide
- 7. B · Microbes come from the air, not from the broth itself
- 8. A · Small cells have a high surface-area-to-volume ratio
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