Cell biology worksheet with answers

Free printable Cell biology worksheet: 8 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy

What are the building blocks (monomers) of DNA called?

  1. AAmino acids
  2. BNucleotides
  3. CFatty acids
  4. DMonosaccharides
2.Easy

Proteins are polymers of which monomers?

  1. AGlycerol molecules
  2. BNucleotides
  3. CSimple sugars
  4. DAmino acids
3.Easy

Which organelle produces most of the cell's ATP?

  1. ARibosome
  2. BMitochondrion
  3. CLysosome
  4. DGolgi apparatus
4.Medium

Which cell junction lets ions and small molecules pass directly between neighbouring cells?

  1. ADesmosome
  2. BAdherens junction
  3. CGap junction
  4. DTight junction
5.Medium

Gut epithelial cells take up glucose against its gradient with a sodium–glucose cotransporter. What kind of transport is this?

  1. APrimary active transport
  2. BSecondary active transport
  3. CFacilitated diffusion
  4. DSimple diffusion
6.Medium

Which enzyme unwinds the DNA double helix during replication?

  1. APrimase
  2. BHelicase
  3. CDNA polymerase
  4. DDNA ligase
7.Hard

A mutant Ras protein cannot hydrolyse GTP. What is the effect on cell signalling?

  1. ARas is broken down faster
  2. BRas stays active and sends constant growth signals
  3. CRas moves into the nucleus and blocks transcription
  4. DRas stays inactive and growth signals stop
8.Hard

Brown fat contains thermogenin (UCP1), which lets protons leak back across the inner mitochondrial membrane. What is the effect?

  1. AEnergy from the proton gradient is released as heat instead of making ATP
  2. BMore ATP is made per glucose
  3. CThe cell switches to fermentation
  4. DThe electron transport chain stops working because protons can no longer be pumped

Answer key

  1. 1. B · Nucleotides
  2. 2. D · Amino acids
  3. 3. B · Mitochondrion
  4. 4. C · Gap junction
  5. 5. B · Secondary active transport
  6. 6. B · Helicase
  7. 7. B · Ras stays active and sends constant growth signals
  8. 8. A · Energy from the proton gradient is released as heat instead of making ATP

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