Chapters and topics
- Evolution and Biodiversity 3 topics · 393 MCQs
- Biological Molecules 3 topics · 453 MCQs
- Cell Structure and Function 3 topics · 350 MCQs
- Enzymes 2 topics · 234 MCQs
- Bioenergetics 2 topics · 211 MCQs
- Human Reproduction 2 topics · 216 MCQs
- Inheritance 3 topics · 310 MCQs
- Molecular Biology: DNA, Gene Expression and Mutations 3 topics · 361 MCQs
- Ecosystem 2 topics · 239 MCQs
- Prokaryotes, Protists and Fungi 3 topics · 356 MCQs
- Viruses, Prions and Viroids 2 topics · 221 MCQs
- Plant Physiology 3 topics · 321 MCQs
Sample Biology MCQs
Try these questions, then open the full practice to work through every chapter. Tap “Show the answer” after you choose.
Q1. The liver fluke belongs to the group:
- Porifera (sponges)
- Aves (birds)
- Echinodermata
- Platyhelminthes
Show the answer
Answer: D. Platyhelminthes
The liver fluke belongs to Platyhelminthes.
Q2. How many peptide bonds are present in a single polypeptide chain of 141 amino acids?
- 139
- 142
- 141
- 140
Show the answer
Answer: D. 140
n amino acids in one chain are joined by n − 1 peptide bonds: 140.
Q3. An advantage of stem cells is that they can be used to:
- replace damaged tissues, e.g. in leukaemia or spinal injuries
- make vaccines only
- replace DNA
- cause cancer deliberately
Show the answer
Answer: A. replace damaged tissues, e.g. in leukaemia or spinal injuries
The correct answer is “replace damaged tissues, e.g. in leukaemia or spinal injuries”. Regenerative medicine.
Q4. The enzyme carbonic anhydrase catalyses:
- starch → maltose
- sucrose → glucose + fructose
- CO₂ + H₂O ⇌ H₂CO₃
- urea → ammonia + CO₂
Show the answer
Answer: C. CO₂ + H₂O ⇌ H₂CO₃
The correct answer is “CO₂ + H₂O ⇌ H₂CO₃”. Carbonic anhydrase: CO₂ + H₂O ⇌ H₂CO₃.
Q5. How many CO₂ molecules are released in total from the complete aerobic oxidation of 5 glucose molecule(s)?
- 60
- 20
- 10
- 30
Show the answer
Answer: D. 30
2 in link reaction + 4 in Krebs per glucose = 6; × 5 = 30.
Q6. Which hormone is secreted by the corpus luteum?
- progesterone
- FSH
- oestrogen
- hCG
Show the answer
Answer: A. progesterone
The correct answer is “progesterone”. Progesterone (source): corpus luteum.
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