Selected MCQ

Current Question
Seafloor spreading occurs primarily at:
  • A. Transform boundaries
  • B. Convergent boundaries
  • C. Divergent boundaries
  • D. Hotspot volcanoes only
Correct Answer: C
Explanation:
New oceanic crust forms where plates move apart at mid-ocean ridges.
Related Question 1
In eukaryotes, transcription occurs primarily in the:
  • A. Ribosome
  • B. Cytosol
  • C. Nucleus
  • D. Mitochondrial matrix only
Correct Answer: C
Explanation:
Nuclear DNA is transcribed in the nucleus before most mRNA is exported.
Related Question 2
Which gas exchange occurs in alveoli?
  • A. O₂ out, CO₂ in
  • B. CO₂ out, O₂ in
  • C. Both out
  • D. None
Correct Answer: B
Explanation:
Oxygen diffuses into blood, CO₂ out.
Related Question 3
The Hadley cell is primarily driven by:
  • A. Polar cooling only
  • B. Differential solar heating between equator and subtropics
  • C. Tidal friction
  • D. Lunar gravity
Correct Answer: B
Explanation:
Strong equatorial heating drives rising air and tropical atmospheric overturning.
Related Question 4
In the rock cycle, basalt can transform into amphibolite primarily by:
  • A. Weathering only
  • B. Metamorphism
  • C. Sublimation
  • D. Bioturbation
Correct Answer: B
Explanation:
Increased pressure and temperature alter basalt mineralogy into metamorphic assemblages.
Related Question 5
In mammals, most nutrient absorption occurs in the:
  • A. Stomach
  • B. Large intestine
  • C. Small intestine
  • D. Esophagus
Correct Answer: C
Explanation:
The small intestine’s villi and microvilli maximize absorptive surface area.