Page 10 - CB1.3 Genetic Varation sciPAD
P. 10
PHOTOCOPYING PROHIBITED
© Silverback Academic Media
10 CB 1.3 GENETIC VARIATION
PRINCIPLES OF GENETIC VARIATION
THIS SECTION HAS BEEN DELIBERATELY LEFT BLANK
Nucleotides
The structure of DNA is the same in all living things. It looks like a twisted ladder, and is known
as a double helix. DNA is made up of simple repeating units called nucleotides. A nucleotide is
comprised of a sugar, a phosphate and a base. The sides of DNA are made up of the sugar and
the phosphate. These sides are held together by bonding between the bases.
1. Label the diagram of the nucleotide shown below.
G
2. State the base that bonds with:
(a) guanine.
(b) adenine.
Unchecked Sample Pages
For Review Purposes Only - Photocopying Prohibited
www.scipad.co.nz
