Selected MCQ

Current Question
Human insulin production by recombinant DNA technology was first achieved in:
  • A. Yeast cells
  • B. Bacterial cells
  • C. Mammalian cells
  • D. Plant cells
Correct Answer: B
Explanation:
The first human protein successfully produced by genetic engineering was insulin, expressed in genetically modified Escherichia coli bacteria.
Related Question 1
Inheritance of human height, which is influenced by many genes and environmental factors, is an example of:
  • A. Codominance
  • B. Polygenic inheritance
  • C. Pleiotropy
  • D. Autosomal dominance
Correct Answer: B
Explanation:
Height is a quantitative trait determined by multiple genes (polygenes) and the environment, consistent with polygenic inheritance.
Related Question 2
Which organelle in animal cells contains its own circular DNA and is involved in ATP production?
  • A. Mitochondrion
  • B. Golgi apparatus
  • C. Peroxisome
  • D. Endoplasmic reticulum
Correct Answer: A
Explanation:
Mitochondria have a circular genome and produce ATP through oxidative phosphorylation.
Related Question 3
The insulin receptor has intrinsic kinase activity. Upon insulin binding, which type of residue on the receptor is autophosphorylated?
  • A. Serine
  • B. Threonine
  • C. Tyrosine
  • D. Glycine
Correct Answer: C
Explanation:
The insulin receptor is a tyrosine kinase. Upon ligand binding, it autophosphorylates tyrosine residues on its cytoplasmic domain.