Question
Lipids are more efficient energy stores than carbohydrates. What is a reason for this?
A. Lipids are bigger molecules than carbohydrates.
B. Lipids release more energy per gram than carbohydrates.
C. Lipids can be more easily mobilized than carbohydrates when needed.
D. Lipids can be used in aerobic and anaerobic respiration when needed.
Answer/Explanation
Ans: B
Question
The table shows the range and classification of body mass index (BMI) values, as shown in the nomogram.
BMI value | Less than 18.5 | 18.5 to 24.9 | 25.0 to 29.9 | 30.0 or more |
Classification | underweight | normal weight | overweight | obese |
What is the approximate reduction in body mass that a person of height 155 cm and mass 95 kg
would have to lose to reach normal body mass?
10 kg
22 kg
36 kg
54 kg
▶️Answer/Explanation
Ans: C
Question
The diagram shows the product of a polymerization reaction.
What is formed in this polymerization reaction?
A. A dipeptide formed by the hydrolysis of two nucleotides
B. A tripeptide formed by the hydrolysis of three amino acids
C. A dipeptide formed by the condensation of two amino acids
D. A tripeptide formed by the condensation of three amino acids
▶️Answer/Explanation
D
Question
What is a consequence of the ability of water to form many intermolecular hydrogen bonds?
A. Ice has a higher density than water and floats, providing habitats for fish-eating mammals.
B. Light can pass through water, so algae can photosynthesise.
C. Some small invertebrates can walk on water surfaces.
D. Small amounts of energy are needed to change water from one state to another, so that evaporation rates and condensation rates are rapid.
▶️Answer/Explanation
C
Question
Which reaction occurs when a dipeptide is formed from amino acids?
A. Hydrolysis
B. Condensation
C. Transcription
D. Oxidation
▶️Answer/Explanation
B
Question
What type of molecule is formed by the chemical reaction shown in the diagram?
A. Dipeptide
B. Disaccharide
C. Diglyceride
D. Cellulose
▶️Answer/Explanation
B
Question
The diagram shows two polysaccharides, formed from condensation of many glucose molecules.
What are the names of X and Y?
▶️Answer/Explanation
A
Question
The diagrams show how monosaccharide molecules are joined to form chains in two polysaccharides.
▶️Answer/Explanation
C
Question
What distinguishes cellulose from glycogen and starch?
A. Only cellulose is found in plants.
B. Only cellulose is made up of glucose monomers.
C. Cellulose is far more branched than starch and glycogen.
D. Cellulose has a structural role whereas starch and glycogen function in energy storage.
▶️Answer/Explanation
D
Question
Which drawing represents beta-D-glucose?
▶️Answer/Explanation
B
Question
The image shows a molecule of oleic acid.
What describes oleic acid?
A. Cis polyunsaturated
B. Cis monounsaturated
C. Trans polyunsaturated
D. Trans monounsaturated
▶️Answer/Explanation
B
Question
Testosterone is a hormone that is important for male reproductive development.
To which group of compounds does testosterone belong?
A. Nucleotides
B. Carbohydrates
C. Lipids
D. Amino acids
▶️Answer/Explanation
C