Biology Test
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1. Which organelle contains digestive enzymes and helps break down waste materials?
Mitochondria
Nucleus
Lysosome
Ribosome
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2. What best describes the role of tRNA during protein synthesis?
Transcribes mRNA in the nucleus
Brings amino acids to the ribosome
Splices introns from pre-mRNA
Forms the ribosome structure
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3. Which component of blood is primarily responsible for clotting?
Red blood cells
Platelets
Plasma
White blood cells
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4. During aerobic respiration, what is the final electron acceptor in the electron transport chain?
Glucose
NAD+
Oxygen
CO₂
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5. In a plant cell, which feature helps maintain cell rigidity and prevents bursting in a hypotonic solution?
Chloroplast
Cytoplasm
Cell wall
Plasma membrane
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6. Which hormone regulates blood glucose levels by promoting uptake into cells?
Glucagon
Adrenaline
Thyroxine
Insulin
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7. Which phase of mitosis involves the chromosomes lining up at the cell's equator?
Prophase
Anaphase
Telophase
Metaphase
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8. What would be the effect of a non-competitive inhibitor on enzyme activity?
Competes with substrate for the active site
Lowers the temperature needed for enzyme activity
Changes the enzyme’s shape, reducing activity
Increases the rate of product formation
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9. Which adaptation helps desert plants minimise water loss?
Broad leaves
Open stomata during the day
Thick waxy cuticle
High stomatal density
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10. Why is the genetic code considered universal?
All organisms use the same number of chromosomes
All organisms replicate DNA in the same way
The same codons code for the same amino acids across all organisms
All organisms share the same DNA sequence
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