TUTORME
LS
40
40
LIFE SCIENCES
GRADE 12
TOPIC DNA – THE CODE OF LIFE
EXAM-STYLE ACTIVITIES
WITH ANNOTATED
MARKING GUIDELINES
This pack is designed to support parents, learners, teachers, and tutors
with high-quality material
,Deoxyribonucleic Acid (DNA)
Activity 1
The diagram below illustrates an organelle.
1. Write the LETTER and NAME of the part that:
a) unwinds to form chromosomes. (2)
b) contains the nucleotides. (2)
2. State TWO functions of part labelled A. (2)
(6)
Activity 2
The diagram below illustrates some nucleotides in a single strand of DNA
1. Give the LETTER and NAME of the part that represents the sugar
portion. (2)
2. How many of the following are represented in the diagram above:
a) nucleotide? (1)
2
© 2025 Tutorme LS. All rights reserved.
, b) sugar-phosphate bonds? (1)
3. Write down the complementary nitrogenous bases for the above
single strand of DNA from the top to bottom. (1)
(5)
Activity 3
The diagram below represents DNA replication.
1. Identify:
a) molecule W. (1)
b) parts labelled X and Y. (2)
c) bond Z. (1)
d) nitrogenous bases V. (1)
2. Where in the cell does this process take place? (1)
3. Which phase of the cell cycle does replication takes place? (1)
(7)
3
© 2025 Tutorme LS. All rights reserved.
LS
40
40
LIFE SCIENCES
GRADE 12
TOPIC DNA – THE CODE OF LIFE
EXAM-STYLE ACTIVITIES
WITH ANNOTATED
MARKING GUIDELINES
This pack is designed to support parents, learners, teachers, and tutors
with high-quality material
,Deoxyribonucleic Acid (DNA)
Activity 1
The diagram below illustrates an organelle.
1. Write the LETTER and NAME of the part that:
a) unwinds to form chromosomes. (2)
b) contains the nucleotides. (2)
2. State TWO functions of part labelled A. (2)
(6)
Activity 2
The diagram below illustrates some nucleotides in a single strand of DNA
1. Give the LETTER and NAME of the part that represents the sugar
portion. (2)
2. How many of the following are represented in the diagram above:
a) nucleotide? (1)
2
© 2025 Tutorme LS. All rights reserved.
, b) sugar-phosphate bonds? (1)
3. Write down the complementary nitrogenous bases for the above
single strand of DNA from the top to bottom. (1)
(5)
Activity 3
The diagram below represents DNA replication.
1. Identify:
a) molecule W. (1)
b) parts labelled X and Y. (2)
c) bond Z. (1)
d) nitrogenous bases V. (1)
2. Where in the cell does this process take place? (1)
3. Which phase of the cell cycle does replication takes place? (1)
(7)
3
© 2025 Tutorme LS. All rights reserved.
