Grade 12 Life Sciences March Paper and Memo:
Total: 60 Marks.
Contents:
DNA | Meiosis | Human Reproduction
This is a practice paper with memorandum meant to test the student's knowledge, and will not be the same paper written for the exam.
THE SM
1.1 Various options are provided as possible answers to the following questions.
Choose the correct answer and write ONLY the LETTER (A-D) next to the
QUESTION NUMBER (1.1.1-1.1.4) on your answer sheet, for example 1.1.5. D.
1.1.1 Base that pairs with Uracil.
A Thymine
B Guanine
C Cytosine
D Adenine
1.1.2 Bond found between amino acids in a protein:
A Peptide bond
B Hydrogen bond
C Phospholipid bond
D Ionic bond
1.1.3 THREE adjacent bases found on a DNA or m-RNA molecule…
A Amino acid
B Codon
C Anticodon
D Protein
1.1.4 Structure where sperm matures:
A Testes
B Sperm duct
C Epididymis
D Vas deferens
[4x2=8]
1|Page www.summariessa.co.za Life Sciences
Grade 12 March Paper
, 1.2 Give the correct BIOLOGICAL TERM for each of the following statements.
Write ONLY the TERM next to the QUESTION NUMBER (1.2.1-1.2.6).
1.1 The structure joining two chromatids together.
1.2 The stage of a cell division during which chromosomes separate into single
chromatids.
1.3 The type of nucleic acid that occurs as a single strand.
1.4 The tangled network of chromosomes located within the nucleus.
1.5 The natural structure of a DNA molecule.
1.6 The type of cells produced in the testes and ovaries.
[1x6=6]
1.3 Indicate whether each of the statements in COLUMN I applies to A ONLY, B
ONLY, BOTH A and B or NONE of the items in COLUMN II. Write A ONLY, B
ONLY, BOTH A and B or NONE next to the QUESTION NUMBER (1.3.1-1.3.3).
COLUMN I COLUMN II
1.3.1 Released by the pituitary gland A: Progesterone
B: Follicle-stimulating hormone
1.3.2 Thymine is used. A: Formation of an mRNA molecule
B: Formation of an exact copy of DNA
in a cell
1.3.3 Contains RNA A: Ribosomes
B: Nucleolus
[3x2=6]
[TOTAL SECTION A: 20]
2|Page www.summariessa.co.za Life Sciences
Grade 12 March Paper
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