Biology 9700/22 — May/June 2021
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Cell Membranes and Transport · Cell Structure · Nucleic Acids and Protein Synthesis · Transport in Mammals · The Mitotic Cell Cycle · Transport in Plants · +5 more
Answer all questions.
Fig. 1.1 is a photomicrograph of a region of eukaryotic tissue. Some of the cells are in stages of mitosis.
Identify which stage of mitosis is shown in cell E and in cell F in Fig. 1.1.
E ______
F ______
Microtubules are present within the cells that are in stages of mitosis, but these are not visible in Fig. 1.1.
State the function of microtubules in mitosis.
State, with a reason, whether Fig. 1.1 shows a region of animal or plant tissue.
Semi-conservative replication of DNA occurs during interphase, before mitosis begins.
Write the correct term in the spaces provided to complete each of statements A to D.
A The DNA double helix unwinds and is separated into two template strands when ______ bonds holding the two strands together are broken.
B One of the template strands of DNA is copied in fragments. The enzyme ______ is required to join the fragments together to form a continuous strand of DNA.
C Complementary DNA nucleotides are added to the template strands, catalysed by the enzyme ______ .
D ______ are regions of repeating nucleotide sequences at the ends of chromosomes that allow the continued replication of DNA, without the loss of genes.
The rest of this paper
5 more questions- Q2Transport in Plants7M
- Q3Transport in Mammals · Cell Membranes and Transport · Nucleic Acids and Protein Synthesis · Biological Molecules15M
- Q4Gas Exchange · Cell Membranes and Transport · Transport in Mammals10M
- Q5Cell Structure · Cell Membranes and Transport · Enzymes11M
- Q6Immunity · Infectious Diseases9M