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QUESTION 1 In prokaryotes deoxyribonucleic acid (DNA) is found as unbound circular DNA in the (A) mitochondria. (B) chloroplasts. (C) nucleus. (D) cytosol.
QUESTION 12 In the structure of DNA adenine pairs with which other base? (A) wuracil (B) guanine (C) cytosine (D) thymine
QUESTION 3 (4 marks) Explain the role of the enzymes helicase and DNA polymerase in the process of DNA replication.
QUESTION 19 What is the role of DNA polymerase in DNA replication? (A) breaking the hydrogen bonds that hold the complementary bases of DNA together (B) adding complementary nucleotide bases to the exposed DNA strands (C) sealing the sequence of DNA into two continuous double strands (D) joining RNA primers to the lagging strand of DNA
QUESTION 26 (4 marks) a) State the three components of a DNA nucleotide. [1 mark] b) Describe the steps involved in DNA profiling. [3 marks]
QUESTION 10 (3 marks) Describe three ways DNA occurs in cells.
QUESTION 6 The role of helicase in DNA replication is to (A) 1nitiate the process by binding to recognition sites along the template strand. (B) add complementary bases to the template strand. (C) unwind and separate DNA strands. (D) join DNA strands together.
QUESTION 20 A section of DNA is made up of two strands I and II. Base Strand I Strand II composition | composition owe || e | e wmive | [0 It can be inferred that (A) strand I contains 25% cytosine. (B) strand I contains 32% adenine. (C) strand II contains 29% thymine. (D) strand II contains 71% adenine.
QUESTION 10 This figure is an example of a structure found in DNA. e r—0— Select the option that best represents the figure. (A) histone (B) nucleus (C) chromatin (D) nucleosome
QUESTION 21 The figure below represents a section of DNA. LabelIis a (A) nucleotide. (B) covalent bond. (C) hydrogen bond. (D) purine molecule.
QUESTION 5 Which statement is true for DNA replication? (A) (B) (C) (D) Adenine pairs with guanine. The process occurs during metaphase I. DNA polymerase unwinds the double helix. New strands are synthesised in the 5’ to 3’ direction.
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