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100+ Free BGCSE Biology 0572 Practice Questions
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2026 Statistics
Key Facts: BGCSE Biology 0572 Exam
0572
BEC Syllabus Code
Botswana Examinations Council
40
Paper 1 MCQs
BEC Exam Structure
45m
Paper 1 Duration
BEC Exam Timetable
Grade C
Target Benchmark
Botswana Education Standard
100
Practice Questions
OpenExamPrep Question Bank
BGCSE Biology 0572 is administered by the Botswana Examinations Council (BEC) for senior secondary students. The assessment tests core biological principles across cell biology, plant transport and photosynthesis, human organ systems, genetics, ecological conservation, and applied biotechnology. This 100-question practice bank provides comprehensive preparation aligned with the BEC 0572 syllabus.
Sample BGCSE Biology 0572 Practice Questions
Try these sample questions to test your BGCSE Biology 0572 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which cell organelle is responsible for synthesizing ATP through aerobic respiration?
A.Ribosome
B.Mitochondrion
C.Golgi apparatus
D.Chloroplast
Explanation: Mitochondria are known as the powerhouses of the cell because they carry out aerobic respiration to produce ATP energy from glucose and oxygen. Ribosomes synthesize proteins, while the Golgi apparatus modifies and packages lipids and proteins. Chloroplasts carry out photosynthesis in plant cells.
2Which structural feature is present in plant cells but absent in animal cells?
A.Cell membrane
B.Cytoplasm
C.Cellulose cell wall
D.Nucleus
Explanation: Plant cells possess a rigid outer cell wall made of cellulose that provides shape and structural support. Animal cells lack a cell wall and are enclosed only by a cell membrane. Both plant and animal cells contain a nucleus, cytoplasm, and cell membrane.
3What chemical reagent is used to test for the presence of reducing sugars such as glucose?
A.Iodine solution
B.Benedict's solution
C.Biuret reagent
D.Ethanol
Explanation: Benedict's solution changes from blue to green, yellow, or brick-red when heated with a reducing sugar like glucose. Iodine solution tests for starch, turning blue-black. Biuret reagent tests for proteins, turning violet, while ethanol tests for lipids in the emulsion test.
4Which process describes the net movement of water molecules from a region of higher water potential to lower water potential across a selectively permeable membrane?
A.Diffusion
B.Active transport
C.Osmosis
D.Phagocytosis
Explanation: Osmosis is the specialized diffusion of solvent (water) molecules down a water potential gradient through a partially permeable membrane. General diffusion applies to any solute or gas particles. Active transport moves substances against a concentration gradient using energy, while phagocytosis is bulk engulfment of particles.
5Enzymes act as biological catalysts because they:
A.Increase the activation energy of metabolic reactions
B.Decrease the activation energy required for reactions to occur
C.Are consumed completely during chemical reactions
D.Change the temperature of the cellular environment
Explanation: Enzymes speed up chemical reactions by lowering the activation energy barrier needed for reactants to form products. Enzymes remain unchanged at the end of reactions and can be reused. They operate within specific temperature ranges without altering body temperature.
6What happens to a red blood cell when placed in a hypertonic salt solution?
A.It swells and undergoes lysis
B.It loses water by osmosis and becomes crenated
C.It absorbs salt ions by active transport until balanced
D.It remains unchanged in volume and shape
Explanation: In a hypertonic solution (lower water potential than cytoplasm), water moves out of the red blood cell by osmosis. Because animal cells lack a cell wall, losing water causes the cell to shrivel and shrink, a process called crenation. Swelling and lysis occur in hypotonic solutions.
7According to the lock-and-key model of enzyme action, which statement correctly describes substrate binding?
A.The enzyme changes its primary structure to match any substrate shape
B.The substrate's shape is complementary to the specific shape of the enzyme's active site
C.Substrates bind non-specifically to the cell wall before entering the active site
D.The active site dissolves the substrate upon initial contact
Explanation: The lock-and-key hypothesis states that an enzyme's active site has a rigid, complementary 3D shape that fits only specific substrate molecules. This specificity explains why individual enzymes catalyze distinct biochemical reactions.
8Which biological macromolecule is formed by glycerol esterified to three fatty acid molecules?
A.Triglyceride
B.Polysaccharide
C.Polypeptide
D.Nucleic acid
Explanation: Triglycerides (fats and oils) consist of one glycerol backbone bonded to three fatty acid tails via ester linkages. Polysaccharides are composed of monosaccharide sugar units, polypeptides consist of amino acids, and nucleic acids are composed of nucleotides.
9How does extreme heat permanently inactivate an enzyme?
A.It breaks peptide bonds and converts the enzyme into glucose
B.It alters the tertiary shape of the protein, denaturing the active site
C.It removes all coenzymes from the cell nucleus
D.It freezes the substrate molecules so they cannot diffuse
Explanation: High temperatures increase kinetic energy, causing atoms within the enzyme to vibrate excessively. This disrupts hydrogen and ionic bonds stabilizing the protein's tertiary structure, denaturing the active site so substrates can no longer bind.
10Active transport across a plasma membrane differs from passive diffusion because active transport:
A.Moves substances down their concentration gradient without ATP
B.Requires carrier proteins and metabolic energy (ATP) to move solutes against a concentration gradient
C.Occurs exclusively in dead cells
D.Involves only non-polar gas molecules like oxygen
Explanation: Active transport utilizes membrane carrier proteins and cellular energy (ATP) to pump molecules across a membrane against their concentration gradient (from low to high concentration). Diffusion is a passive process that moves substances down a gradient without ATP.
About the BGCSE Biology 0572 Practice Questions
Verified exam format metadata for Botswana BGCSE Biology (Syllabus 0572) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.