Cell biology worksheet with answers

Which structure is found in plant cells but not in animal cells?

1. AMitochondria
2. BCell membrane
3. CCell wall
4. DRibosomes

Which organelle produces most of the cell's ATP?

1. ALysosome
2. BMitochondrion
3. CRibosome
4. DGolgi apparatus

What is the function of ribosomes?

1. APhotosynthesis
2. BCell division
3. CProtein synthesis
4. DLipid storage

Which cell junction seals neighbouring epithelial cells together and stops fluid leaking between them?

1. AHemidesmosome
2. BTight junction
3. CDesmosome
4. DGap junction

Which cell junction anchors intermediate filaments and gives tissues such as skin mechanical strength?

1. ATight junction
2. BPlasmodesma
3. CDesmosome
4. DGap junction

Which molecules can cross a phospholipid bilayer most easily by simple diffusion?

1. ASmall non-polar molecules such as O₂ and CO₂
2. BProteins such as albumin
3. CIons such as Na⁺ and K⁺
4. DLarge polar molecules such as glucose

Okazaki fragments are formed on:

1. AThe lagging strand during DNA replication
2. BmRNA during translation
3. CtRNA during transcription
4. DThe leading strand

A mutation in the lac repressor stops it binding to the operator. What is the result?

1. AThe bacteria can no longer take up glucose
2. BThe lac genes are expressed only when glucose is present in the medium
3. CThe lac genes can never be expressed
4. DThe lac genes are expressed all the time, even without lactose