Oxford Cambridge and RSA
AS Level Biology A
H020/01 Breadth in biology
Thursday 24 May 2018 – Afternoon
Time allowed: 1 hour 30 minutes
You may
... [Show More] use:
• a scientific or graphical calculator
• a ruler (cm/mm)
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SECTION A
You should spend a maximum of 25 minutes on this section.
Write your answer in the box provided.
Answer all the questions.
1 Which organelle, A to D, is not involved in the production and secretion of enzymes in eukaryotes?
A golgi apparatus
B ribosomes
C smooth endoplasmic reticulum
D vesicle
Your answer [1]
2 Autoimmune diseases are often treated with a course of antibody injections.
Which of the following statements, A to D, describes the immunity arising from this treatment?
A active natural immunity
B active artificial immunity
C passive natural immunity
D passive artificial immunity
Your answer [1]
3 A student designed an investigation into the rate of transpiration in plants. They used eight leaves
of the same size, age and species. They kept environmental conditions such as wind speed,
temperature and humidity constant.
Why did the student take readings from eight different leaves?
A to make their investigation valid
B to increase the accuracy of their readings
C to assess the repeatability of their data
D to improve the precision of their results
Your answer [1]
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4 The image below shows isomaltulose, a disaccharide formed from α-glucose and fructose.
O
O
H
H
H
H
H OH
OH
CH2OH
OH H
O H
OH
H OH
H H
HO
CH2OH
Name the bond that holds the α-glucose and the fructose together.
A 1,6-glycosidic bond
B phosphodiester bond
C ester bond
D 1,4-glycosidic bond
Your answer [1]
5 The graph shows the rate of movement of four different substances across a membrane.
A
B
C
D
concentration difference
across membrane
rate of movement
across membrane
The substances shown in the graph are: carbon dioxide, testosterone (a lipid-based hormone),
ethanol and sodium ions.
Which of the lines, A to D, represents the pattern of movement of sodium ions across a membrane?
Your answer [1 [Show Less]