Biology 9700/23 — May/June 2019
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Cell Structure · The Mitotic Cell Cycle · Gas Exchange · Transport in Plants · Immunity · Transport in Mammals · +5 more
Fig. 1.1 is a diagram showing the structure of a section of a DNA molecule.
Fig. 1.1
Draw a circle around one monomer of DNA in Fig. 1.1.
Name the two bases forming the base pair at X in Fig. 1.1 and give a reason for your answer.
bases = ______
reason = ______
The statements 1–5 describe events that occur during DNA replication.
1 DNA polymerase forms a phosphodiester bond
2 DNA double helix forms
3 hydrogen bonds break
4 hydrogen bonds form
5 two strands of the double helix separate
Write the numbers 1 to 5 in the spaces below to show the order in which these events occur.
The first one has been done for you.
3 ______ ______ ______ ______
The telomere is a region found at the end of a chromosome.
Outline the function of telomeres.
The rest of this paper
5 more questions- Q2Cell Structure · Gas Exchange · Transport in Plants13M
- Q3Cell Structure · Infectious Diseases · Immunity13M
- Q4Transport in Plants · Biological Molecules9M
- Q5Cell Structure · Immunity · Cell Membranes and Transport · Transport in Mammals · Enzymes10M
- Q6Transport in Mammals · Gas Exchange · The Mitotic Cell Cycle9M