Science Coordinate 0654: B3. Biological molecules Topical Past Paper Questions
Cambridge IGCSE Science Coordinate (0654) past-paper questions on B3. Biological molecules, free. This topic is frequently examined across 23 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.
Sample questions
A student investigates the effect of enzyme volume on an enzyme-controlled reaction. Plant cells such as celery cells contain the enzyme catalase. Catalase speeds up the breakdown of aqueous hydrogen peroxide into water and oxygen gas. The oxygen gas released forms a foam when mi…
A student tests potato and milk for their nutrient content. ## (a) Procedure The student: - puts some potato into two test-tubes • adds biuret solution to one of the test-tubes • adds iodine solution to the other test-tube • observes the final colour in each test-tube. The studen…
(a) Phenylketonuria (PKU) is an inherited disorder controlled by a single gene. People with PKU have to limit how much protein they eat. The allele for PKU is recessive (d). Fig. 4.1 is a pedigree diagram showing the inheritance of PKU in one family. Fig. 4.1 (i) Use Fig. 4.1 to…
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