CAIE A-Level Biology AS 1.2.2 Cell Images and Drawings Questions
Recognise prokaryotic cell structures and compare their organisation with eukaryotic cells using mark-scheme evidence.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- AS
Exam points
- Explain the structure and function of prokaryotic cells and distinguish them from eukaryotic cells.
CAIE A-Level Biology AS 1.2.2 Cell Images and Drawings Questions question 1
The electron micrograph shows onion root cells prepared using a freeze-fracture technique. The cells were quickly frozen and then physically broken apart. Freeze fracture breaks apart cells along weak areas, such as membranes and the surfaces of organelles.
\(\times 20000\)
Which statement best explains the appearance of the electron micrograph?
A
The cells were broken apart at the endoplasmic reticulum; structure X is a ribosome.
B
The cells were broken apart at the nuclear envelope; structure X is a nuclear pore.
C
The cells were broken apart at the nuclear envelope; structure X is a ribosome.
D
The cells were broken apart at the tonoplast; structure X is a plasmodesma.
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