MDCAT Pakistan · Biology

Cellular Biology and Biological Molecules

9 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 9 questions

  1. According to the fluid mosaic model, what primary interaction stabilizes the lipid bilayer of eukaryotic plasma membranes?
  2. In an enzyme-catalyzed reaction, a competitive inhibitor is added. How do the kinetic parameters maximum velocity (Vmax) and the Michaelis constant (Km) change?
  3. During eukaryotic DNA replication, which enzyme synthesizes the short RNA primer required to initiate leading and lagging strand synthesis?
  4. What post-transcriptional modification protects eukaryotic pre-mRNA from 5' exonucleolytic degradation and assists in ribosome binding?
  5. In the complete aerobic oxidation of one mole of glucose, how many net molecules of ATP are directly generated by substrate-level phosphorylation?
  6. Which complex of the mitochondrial electron transport chain does NOT pump protons across the inner mitochondrial membrane into the intermembrane space?
  7. What organelle contains acid hydrolases maintained at an internal pH of approximately 4.5 to 5.0 for macromolecular degradation?
  8. In photorespiration, which cellular organelles cooperate sequentially in the glycolate pathway to recover phosphoglycolate?
  9. Which covalent linkage connects monosaccharide units together to form glycogen and amylose polysaccharides?

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