Name: _______________________________________________
Unit 1 Biology past paper questions
Date:
Time:
Total marks available:
Total marks achieved: ______
,Questions
Q1.
Figure 1 shows an electron micrograph of a red blood cell in a capillary.
Red blood cells are flexible.
An unbalanced diet can increase the risk of atherosclerosis.
Fatty plaques build up in the wall of arteries causing atherosclerosis.
The fatty plaques reduce the diameter of the lumen of the arteries.
Figure 2 shows the cross section of two arteries.
Artery A is a healthy human artery with a lumen diameter of 3.40 mm.
Artery B is a human artery affected by atherosclerosis.
Artery B has a lumen diameter of 2.72 mm.
,(i) Calculate the percentage decrease in the diameter of the lumen in artery B compared with the lumen
in artery A.
Show your working.
(3)
........................................................... %
(ii) Identify the type of dietary nutrient that may contribute to the development of fatty plaques in the walls
of arteries.
(1)
A polyunsaturated fats
B protein
C saturated fats
D soluble fibre
(iii) Scientists investigated how smoking affects the risk of developing atherosclerosis.
Graph 1 shows some of their results.
, State, using information from Graph 1, two observations about the effect of smoking on the development
of atherosclerosis.
(2)
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
(Total for question = 6 marks)
Q2.
A microbiologist measures an electron micrograph image of a bacterium to be 4.5 cm in length.
The magnification used to view the bacterium was 22 500×.
Calculate the actual size of the bacterium.
Show your working.
Unit 1 Biology past paper questions
Date:
Time:
Total marks available:
Total marks achieved: ______
,Questions
Q1.
Figure 1 shows an electron micrograph of a red blood cell in a capillary.
Red blood cells are flexible.
An unbalanced diet can increase the risk of atherosclerosis.
Fatty plaques build up in the wall of arteries causing atherosclerosis.
The fatty plaques reduce the diameter of the lumen of the arteries.
Figure 2 shows the cross section of two arteries.
Artery A is a healthy human artery with a lumen diameter of 3.40 mm.
Artery B is a human artery affected by atherosclerosis.
Artery B has a lumen diameter of 2.72 mm.
,(i) Calculate the percentage decrease in the diameter of the lumen in artery B compared with the lumen
in artery A.
Show your working.
(3)
........................................................... %
(ii) Identify the type of dietary nutrient that may contribute to the development of fatty plaques in the walls
of arteries.
(1)
A polyunsaturated fats
B protein
C saturated fats
D soluble fibre
(iii) Scientists investigated how smoking affects the risk of developing atherosclerosis.
Graph 1 shows some of their results.
, State, using information from Graph 1, two observations about the effect of smoking on the development
of atherosclerosis.
(2)
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
(Total for question = 6 marks)
Q2.
A microbiologist measures an electron micrograph image of a bacterium to be 4.5 cm in length.
The magnification used to view the bacterium was 22 500×.
Calculate the actual size of the bacterium.
Show your working.
