Cell biology worksheet with answers

In which phase of the cell cycle is DNA replicated?

1. AG2 phase
2. BS phase
3. CG1 phase
4. DM phase

What is the final electron acceptor in aerobic respiration?

1. ACarbon dioxide
2. BGlucose
3. CNAD⁺
4. DOxygen

Which organelle carries out photosynthesis?

1. AGolgi apparatus
2. BMitochondrion
3. CChloroplast
4. DNucleus

How do steroid hormones such as cortisol mainly act on their target cells?

1. AThey bind a membrane receptor and open ion channels, changing the cell's membrane potential
2. BThey are taken up by phagocytosis and digested
3. CThey activate adenylyl cyclase from outside the cell
4. DThey cross the membrane and bind intracellular receptors that change gene transcription

What separates during anaphase I of meiosis?

1. ASister chromatids
2. BHomologous chromosomes
3. CCentromeres of each chromatid
4. DWhole nuclei

Transcription produces:

1. AProtein from mRNA
2. BDNA from RNA
3. CDNA from DNA
4. DmRNA from a DNA template

Which statement about the sodium–potassium pump is correct?

1. AIt moves 2 Na⁺ out and 3 K⁺ in
2. BIt moves Na⁺ and K⁺ in the same direction across the membrane
3. CIt needs no energy
4. DIt moves 3 Na⁺ out and 2 K⁺ in for each ATP used

In Griffith's 1928 experiment, mice injected with heat-killed smooth (S) pneumococci plus live rough (R) bacteria died. What did this show?

1. AHeat does not kill S bacteria
2. BA substance from the dead S cells transformed R cells into a virulent form
3. CR bacteria are virulent on their own
4. DMice make S bacteria from R bacteria