Biology 9700/23 — May/June 2013
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Cell Structure · Cell Membranes and Transport · Transport in Plants · Nucleic Acids and Protein Synthesis · (outdated) Ecology · Enzymes · +4 more
Fig. 1.1 is an electron micrograph of a transverse section of palisade mesophyll tissue in the leaf of the flowering plant, Zinnia elegans.
Name the features labelled A, B and C.
A ______
B ______
C ______
Calculate the width of the vacuole across the line X-Y.
Show your working and give your answer to the nearest micrometre ().
answer = ______
The membrane surrounding the vacuole, called the tonoplast, has a fluid mosaic structure.
Describe the structure of this membrane.
Palisade mesophyll cells have very large vacuoles.
Explain how water moves from the xylem in the leaf into these vacuoles.
The rest of this paper
5 more questions- Q2Nucleic Acids and Protein Synthesis · Cell Structure9M
- Q3(outdated) Ecology11M
- Q4Enzymes12M
- Q5The Mitotic Cell Cycle · Biological Molecules11M
- Q6Infectious Diseases · Immunity5M