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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Name: ____________________   Date: ____________

1.Easy

What is a gene?

  1. AA protein that copies DNA
  2. BA single nucleotide
  3. CA DNA sequence that codes for a protein or functional RNA
  4. DA whole chromosome
2.Easy

How many chromosomes are in a normal human body (somatic) cell?

  1. A23
  2. B44
  3. C48
  4. D46
3.Easy

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

  1. AFatty acids
  2. BAmino acids
  3. CNucleotides
  4. DMonosaccharides
4.Medium

Transcription produces:

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

Which enzyme unwinds the DNA double helix during replication?

  1. APrimase
  2. BHelicase
  3. CDNA ligase
  4. DDNA polymerase
6.Medium

How does glucose enter most body cells, such as red blood cells?

  1. ABy facilitated diffusion through GLUT carrier proteins
  2. BBy simple diffusion through the lipid bilayer
  3. CBy primary active transport using ATP directly at the membrane
  4. DBy phagocytosis
7.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. BThe cell switches to fermentation
  3. CMore ATP is made per glucose
  4. DThe electron transport chain stops working because protons can no longer be pumped
8.Hard

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

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

Answer key

  1. 1. C · A DNA sequence that codes for a protein or functional RNA
  2. 2. D · 46
  3. 3. C · Nucleotides
  4. 4. D · mRNA from a DNA template
  5. 5. B · Helicase
  6. 6. A · By facilitated diffusion through GLUT carrier proteins
  7. 7. A · Energy from the proton gradient is released as heat instead of making ATP
  8. 8. C · Ras stays active and sends constant growth signals

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