Sample Biology Questions
Q1: Which molecule carries amino acids to the ribosome during translation?
A. mRNA
B. rRNA
C. tRNA ✓
D. DNA
Q2: What is the powerhouse of the cell?
A. Nucleus
B. Ribosome
C. Mitochondria ✓
D. Chloroplast
Q3: Darwin's finches on the Galápagos Islands are an example of:
A. Genetic drift
B. Adaptive radiation ✓
C. Convergent evolution
D. Punctuated equilibrium
📖 Study Tips for Biology
1
Organize your study around the major themes: cell structure, metabolism, genetics, evolution, and ecology — they interconnect more than they seem.
2
For genetics, practice Punnett squares for monohybrid and dihybrid crosses until the process is automatic.
3
Understand natural selection's four requirements: variation, heritability, differential survival/reproduction, and limited resources.
4
Learn the levels of ecological organization: organism → population → community → ecosystem → biosphere.
❓ Biology FAQ
What is the central dogma of molecular biology?
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The central dogma describes the flow of genetic information: DNA is transcribed into RNA, which is translated into protein. It was proposed by Francis Crick in 1958 and explains how genetic instructions are expressed as functional molecules.
What is the difference between prokaryotic and eukaryotic cells?
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Prokaryotic cells (bacteria, archaea) lack a membrane-bound nucleus and membrane-bound organelles — their DNA floats freely in the cytoplasm. Eukaryotic cells (animals, plants, fungi, protists) have a nucleus and complex organelles like mitochondria and ER.
What is an ecosystem?
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An ecosystem is a community of living organisms (biotic factors) interacting with each other and with their non-living environment (abiotic factors — water, light, temperature, soil). Energy flows through ecosystems via food chains and webs.
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