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OCR A-level Biology past paper questions and mark scheme answers
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OCR A-level Biology past paperquestions and mark scheme answers
C
microscopes vary in their magnification and resolution.
Which of the rows, A to D, in the table below is correct?
B
carbohydrates, such as starch, are made from monosaccharides joined together.
which of the bonds, A to D, joins monosaccharides together?
a. ester
b. glycosidic
c. peptide
d. phosphodiester
D
some inorganic ions have roles in enzyme-controlled reactions.
which of the rows, A to D, in the table below is correct?
C
which of the following statements, A to D, about the nature of the genetic code is incorrect?
a. it is a degenerate code
b. it is a triplet code
c. it is overlapping
d. it is universal
C
ventilation involves various parts of the mammalian respiratory system.
which of the following statements, A to D, describes inhalation?
a. ribcage moves upwards and outwards; external intercostal muscles relax; diaphragm
relaxes
b. ribcage moves downwards and inwards; external intercostal muscles relax; diaphragm
relaxes
c. ribcage moves upwards and outwards; external intercostal muscles contract; diaphragm
contracts
, d. ribcage moves downwards and inwards; external intercostal muscles contract; diaphragm
contracts.
D
which of the following structures, A to D, are found in prokaryotes and eukaryotes?
a. a cell wall made of peptidoglycan
b. circular genomic DNA
c. a nucleus surrounded by a nuclear membrane
d. ribosomes
B
the pressure changes in one mammalian cardiac cycle are shown in the graph below.
which of the following time periods, A to D, shows ventricular systole?
C
measles is a serious disease that can be prevented by vaccination. the chart below shows
the measles-containing vaccine (MCV) coverage and annual reported cases of measles
between 1980 and 2013.
which of the following statements, A to D, is a correct interpretation of the chart?
a. an increase in herd immunity resulted in fewer deaths from measles
b. the highest number of measles cases occured when MCV coverage was at its lowest
c. a 90% MCV coverage resulted in fewer than half a million cases of measles each year
d. there is a positive correlation between the number of measles cases and the MCV
coverage
A
two different fields, field G and H, were sampled for three common species of wildflower. the
results are show below.
which of the options, A to D, is correct?
a. field G will have a greater Simpson's diversity index
b. field H has greater species evenness
c. field H will have a greater Simpson's diversity index
d. field G has a greater species richness
A
which of the following options, A to D, lists the three domains of life?
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