Question 23
Question 23 of 40
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No letter options?
Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
6. Nucleic acids and prot...
6.1. Structure of nucleic acids and...

describe the structure of a DNA molecule as a double helix, including: • the importance of complementary base pairing between the 5’ to 3’ strand and the 3’ to 5’ strand (antiparallel strands) • differences in hydrogen bonding between C–G and A–T base pairs • linking of nucleotides by phosphodiester bonds

2. Biological molecules
2.2. Carbohydrates and lipids

state that glucose, fructose and maltose are reducing sugars and that sucrose is a non-reducing sugar

2. Biological molecules
2.3. Proteins

describe the types of interaction that hold protein molecules in shape: • hydrophobic interactions • hydrogen bonding • ionic bonding • covalent bonding, including disulfide bonds