Grade 12 Life Sciences (LS) March Paper and Memo - 2024

GRADE 12 LIFE SCIENCES MARCH TEST


SECTION A
QUESTION 1

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]




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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]




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