Cell biology worksheet with answers

What is phagocytosis?

1. AThe uptake of small ions through channels
2. BThe uptake of large particles by engulfing them in membrane
3. CThe release of proteins from the cell in membrane-bound vesicles
4. DThe movement of water across a membrane

What does meiosis produce from one diploid cell?

1. AFour genetically identical haploid cells
2. BFour genetically different haploid cells
3. CTwo genetically identical diploid cells
4. DTwo genetically different diploid cells

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

1. ARibosomes
2. BCell wall
3. CMitochondria
4. DCell membrane

Which enzyme makes the second messenger cyclic AMP when activated by a Gs protein?

1. APhosphodiesterase
2. BProtein kinase A
3. CAdenylyl cyclase
4. DPhospholipase C

Which tag added in the Golgi sends enzymes to the lysosomes?

1. AA nuclear localisation signal
2. BA KDEL sequence
3. CMannose-6-phosphate
4. DUbiquitin

A competitive inhibitor binds the active site of an enzyme. What can overcome its effect?

1. ALowering the temperature to 0 °C
2. BRaising the substrate concentration
3. CRaising the inhibitor concentration
4. DRemoving the enzyme's cofactor

Avery, MacLeod and McCarty treated the transforming extract with different enzymes. Which result showed that DNA was the transforming principle?

1. AOnly RNase destroyed the transforming activity
2. BOnly protease destroyed the transforming activity
3. CNone of the enzymes had any effect
4. DOnly DNase destroyed the transforming activity

In eukaryotic mRNA processing, splicing removes:

1. AExons
2. BThe poly-A tail
3. CThe 5′ cap
4. DIntrons