Biology May 2017 AS Biology Paper 1
questions with complete answers
Adenosine Triphosphate (ATP) is a nucleotide derivative. Contrast the structures of ATP
and a nucleotide found in DNA to give two differences. (2) - ANSWER: - ATP has 3
phosphates whereas DNA has 1 phosphate
- ATP base is always adenine and in DNA nucleotide bases can be different.
Explain the advantages of lipid droplet formation and micelle formation. (3) - ANSWER:
- Droplets increase surface area for lipase action
- So faster hydrolysis of triglycerides
- Micelles carry fatty acids and glycerol through the membrane to the cell.
Name structure Q and suggest how it is involved in the absorption of lipids. (4)
(Q is Golgi) - ANSWER: - Modifies and processes triglycerides
- Combines triglycerides with proteins
- Forms vesicles
Explain the role of the heart in the formation of tissue fluid. (2) - ANSWER: - contraction
of ventricle produces high hydrostatic pressure
- this forces water out of blood capillaries
Lymphodema is a swelling in the legs which may be caused by a blockage in the
lymphatic system. Suggest how a blockage in the lymphatic system could cause
lymphodema. (1) - ANSWER: - excess tissue fluid cannot be reabsorbed
The scientists used a statistical test to determine wheether there was a significant
difference in the amino acid concentration in the two types of white win. Name the
statistical test the scientists used and give a reason for your answer. Was the different
significant? Give a reason for your answer.
questions with complete answers
Adenosine Triphosphate (ATP) is a nucleotide derivative. Contrast the structures of ATP
and a nucleotide found in DNA to give two differences. (2) - ANSWER: - ATP has 3
phosphates whereas DNA has 1 phosphate
- ATP base is always adenine and in DNA nucleotide bases can be different.
Explain the advantages of lipid droplet formation and micelle formation. (3) - ANSWER:
- Droplets increase surface area for lipase action
- So faster hydrolysis of triglycerides
- Micelles carry fatty acids and glycerol through the membrane to the cell.
Name structure Q and suggest how it is involved in the absorption of lipids. (4)
(Q is Golgi) - ANSWER: - Modifies and processes triglycerides
- Combines triglycerides with proteins
- Forms vesicles
Explain the role of the heart in the formation of tissue fluid. (2) - ANSWER: - contraction
of ventricle produces high hydrostatic pressure
- this forces water out of blood capillaries
Lymphodema is a swelling in the legs which may be caused by a blockage in the
lymphatic system. Suggest how a blockage in the lymphatic system could cause
lymphodema. (1) - ANSWER: - excess tissue fluid cannot be reabsorbed
The scientists used a statistical test to determine wheether there was a significant
difference in the amino acid concentration in the two types of white win. Name the
statistical test the scientists used and give a reason for your answer. Was the different
significant? Give a reason for your answer.
