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.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

1.Easy

Which base pairs with adenine in DNA?

  1. AGuanine
  2. BUracil
  3. CThymine
  4. DCytosine
2.Easy

Which organelle mainly makes lipids and detoxifies drugs, especially in liver cells?

  1. ALysosome
  2. BSmooth endoplasmic reticulum
  3. CRough endoplasmic reticulum
  4. DNucleolus
3.Easy

Osmosis is the movement of:

  1. AProteins into the nucleus
  2. BWater across a semi-permeable membrane from lower to higher solute concentration
  3. CAny molecule across a membrane from high to low concentration, without using energy
  4. DIons using ATP
4.Medium

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

  1. AMannose-6-phosphate
  2. BA KDEL sequence
  3. CUbiquitin
  4. DA nuclear localisation signal
5.Medium

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

  1. ALarge polar molecules such as glucose
  2. BIons such as Na⁺ and K⁺
  3. CSmall non-polar molecules such as O₂ and CO₂
  4. DProteins such as albumin
6.Medium

What are aquaporins?

  1. AEnzymes that split water into hydrogen and oxygen in membranes
  2. BPumps that move sodium out of cells
  3. CChannel proteins that let water cross membranes quickly
  4. DReceptors for water-soluble hormones
7.Hard

Some antibiotics, such as tetracyclines, block bacterial protein synthesis with little effect on human cytoplasmic ribosomes. Why?

  1. AHuman cells do not make proteins
  2. BHuman ribosomes are inside the nucleus
  3. CBacterial 70S ribosomes differ in structure from eukaryotic 80S ribosomes
  4. DBacteria use DNA instead of mRNA as the template for translation on ribosomes
8.Hard

Mitochondria have their own DNA, but where are most mitochondrial proteins made?

  1. AInside the mitochondrion from mitochondrial genes
  2. BIn the rough ER and delivered by vesicles
  3. CIn the Golgi apparatus
  4. DOn cytosolic ribosomes from nuclear genes, then imported

Answer key

  1. 1. C · Thymine
  2. 2. B · Smooth endoplasmic reticulum
  3. 3. B · Water across a semi-permeable membrane from lower to higher solute concentration
  4. 4. A · Mannose-6-phosphate
  5. 5. C · Small non-polar molecules such as O₂ and CO₂
  6. 6. C · Channel proteins that let water cross membranes quickly
  7. 7. C · Bacterial 70S ribosomes differ in structure from eukaryotic 80S ribosomes
  8. 8. D · On cytosolic ribosomes from nuclear genes, then imported

Full step-by-step solutions: practise this topic on examproblems.com.