AQA AS Level Biology Paper
1 June 2018 latest update
2024 GRADED A+
, Name the blood vessels that carry blood to the heart muscle. [1
mark] - CORRECT ANSWER-coronary arteries
What is a monomer? (1 mark) - CORRECT ANSWER-the smaller/
repeating unit from which larger molecules/polymers are made
Following digestion and absorption of food, the undigested remains
are processed to form faces in the parts of the intestine below the
ileum.
The faeces of people with constipation are dry and hard.
constipation can be treated by drinking lactulose. Lactulose is
soluble, but not digested or absorbed in the human intestine.
Use your knowledge of water potential to suggest why lactulose can
be used to help people suffering from constipation. (2 marks) -
CORRECT ANSWER-(lactulose) lowers water potential in the faeces
water enters due to osmosis and softens the faeces
Give two features of DNA and explain how each one is important in
the semi-conservative replication of DNA. (2 marks) - CORRECT
ANSWER-Weak / easily broken hydrogen bonds between bases
allow two strands to separate / unzip;
1 June 2018 latest update
2024 GRADED A+
, Name the blood vessels that carry blood to the heart muscle. [1
mark] - CORRECT ANSWER-coronary arteries
What is a monomer? (1 mark) - CORRECT ANSWER-the smaller/
repeating unit from which larger molecules/polymers are made
Following digestion and absorption of food, the undigested remains
are processed to form faces in the parts of the intestine below the
ileum.
The faeces of people with constipation are dry and hard.
constipation can be treated by drinking lactulose. Lactulose is
soluble, but not digested or absorbed in the human intestine.
Use your knowledge of water potential to suggest why lactulose can
be used to help people suffering from constipation. (2 marks) -
CORRECT ANSWER-(lactulose) lowers water potential in the faeces
water enters due to osmosis and softens the faeces
Give two features of DNA and explain how each one is important in
the semi-conservative replication of DNA. (2 marks) - CORRECT
ANSWER-Weak / easily broken hydrogen bonds between bases
allow two strands to separate / unzip;
