Grade 12 Life Sciences March Paper and Memo:
Total: 75 Marks. Time: 1hour 30min
Contents:
DNA | Meiosis | DNA profiling | Protein synthesis | Down syndrome
This is a practice paper with memorandum meant to test the student's knowledge, and will not be the same paper writ...
Examiner: Ms N.Harmse
Date: MARCH 2024 Time: 1 hour 30 minutes
Total: 75
SECTION A
QUESTION 1
1.1 Different options are given as possible answers for the following questions. Choose the
correct answer and write only the letter (A to D) next to the question number (1.1.1 to 1.1.5)
on the FOLIO PAPER e.g. 1.1.6 E.
1.1.1 The shape of DNA consists of two strands joined together and twisted spirally.
A. Double helix.
B. Helix.
C. Hereditary
D. DNA
1.1.2 Who received the Nobel Prize for the discovery of the structure of DNA
A Watson and Franklin.
B Franklin and Crick.
C Crick and Wilkins.
D Watson and Crick.
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Grade 12 March Paper
, 1.1.3 2nd stage of protein synthesis – amino acids combines to form a protein
A. Transcription.
B. Translation.
C. Protein synthesis.
D. Meiosis.
1.1.4 Anti-codon
A. three nitrogenous bases one after the other on mRNA
B. three nitrogenous bases one after the other on tRNA
C. three nitrogenous bases one after the other on rRNA
D. three nitrogenous bases one after the other on tDNA
1.1.5 DNA was analysed and found to contain 14% T (thymine). What percentage of the
molecule is cytosine?
A. 14%
B. 28%
C. 36%
D. 72%
[5 x 2 = 10]
1.2 Give the correct biological term for each of the following descriptions.
Write down only the term next to the question number. (1.2.1 to 1.2.5) on your FOLIO
PAPER.
1.2.1 One of the two identical strands of a replicated chromosome.
1.2.2 A pair of chromosomes of the same shape, size.
1.2.3 The phase in the cell cycle when DNA replication occurs.
1.2.4 One complete sets of chromosomes in a cell.
1.2.5 Point where two chromatids overlap during crossing over.
[5]
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Grade 12 March Paper
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