3(b)Inheritance

Question 1

3.14

Genome

Answer 1

Is the entire DNA of an organism and is a
section of a molecule of DNA that codes for a specific protein

Question 2

3.14

Gene

Answer 2

Is a
section of a molecule of DNA that codes for a specific protein

Question 3

3.15

understand that the nucleus of a cell contains chromosomes on which genes are
located

Question 4

3.16B

DNA molecule

Answer 4

Two strands coiled to form a double helix, the
strands being linked by a series of paired bases: adenine (A) with thymine
(T), and cytosine (C) with guanine (G)

Question 5

3.17B

RNA molecule

Answer 5

Single stranded and contains uracil (U)
instead of thymine (T)

Question 6

3.18B

Transcription

Answer 6

• DNA contains the genetic code and this is used as a template for the synthesis of mRNA.
• A complementary strand of mRNA is formed.
• The mRNA leaves the nucleus and enters the cytoplasm.

Question 7

3.18B

Translation

Answer 7

• Here a ribosome binds to the mRNA and translation begins.
• The ribosome reads the code/codon, matching tRNA anticodons in sequence.
• Each tRNA carries its unique amino acid. The sequence of codons defines the sequence of amino acids.
• The amino acids are joined by the ribosome, using peptide bonds, to form a protein/polypeptide.

Question 8

3.18B

Role of mRNA