Q1 MCQ Drill: 2019 Life Sciences P2 (2019 NSC October/November National Examination)

Life Sciences Past Paper Question 1 Drill Level 1: Knowledge & Recall

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5 multiple-choice questions taken verbatim from Section A of the official 2019 NSC October/November National Examination Life Sciences Paper 2, auto-marked against the official marking guideline. Questions that rely on diagrams or graphs are excluded - see the full paper for those.

Question 1 of 5 2 Marks

Which ONE of the following refers to a gradual change in the structure of organisms over time?

A. Natural selection

B. Mutation

C. Evolution

D. Speciation

Question 2 of 5 2 Marks

Study the mechanisms below: (i) Species-specific courtship behaviour (ii) Infertile offspring (iii) Adaptation to different pollinators (iv) Breeding at the same time of the year Which ONE of the following combinations represents reproductive isolating mechanisms?

A. (i), (ii) and (iv) only

B. (ii), (iii) and (iv) only

C. (i), (ii) and (iii) only

D. (i), (ii), (iii) and (iv)

Question 3 of 5 2 Marks

A sample of DNA has 60 guanine bases and 30 adenine bases. How many phosphate molecules would you expect in this sample of DNA?

A. 30

B. 90

C. 180

D. 270

Question 4 of 5 2 Marks

The theory of evolution has been supported by a comparative study of the structure of vertebrate forelimbs from the fossil record. Which ONE of the following represents the statement above?

A. Genetic evidence

B. Modification by descent

C. Natural selection

D. Biogeography

Question 5 of 5 2 Marks

Study the following effects: (i) The double helix DNA will not unwind during DNA replication (ii) mRNA will not form (iii) DNA replication will not take place (iv) Translation in protein synthesis will not take place Which ONE of the following combinations of effects will result if the hydrogen bonds in DNA were strong?

A. (i), (ii) and (iv) only

B. (i), (ii) and (iii) only

C. (ii), (iii) and (iv) only

D. (i), (ii), (iii) and (iv)

Q1 MCQ Drill: 2019 Life Sciences P2 (2019 NSC October/November National Examination)

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