Cell Structure
The diagram below shows parts of a plant cell.
Which part of the cell is composed of cellulose?
A. Nucleus
B. Cell wall
C. Cell membrane
D. Cytoplasm
The correct answer is: B. Cell wall.
Which structural feature is found in a plant cell and not in an animal cell?
C. Cell wall
Which line in the table below describes correctly the functions of the cell wall and mitochondria in plant cells?
Function of the cell wall:
- Prevents cell bursting
- Controls entry of substances
Function of the mitochondria:
- Aerobic respiration
- Photosynthesis
The parts of the cell that would also be found in an animal cell are N and N.
The diagram below represents a plant cell. The parts M and N would also be found in an animal cell.
The diagram below shows the structures present in a fungal cell. The correct answer is: X controls all the cell's activities, Y is the site of protein synthesis, and Z is the site of aerobic respiration.
A group of students carried out an investigation into the variety of cell types. They examined animal, plant, bacterial, and fungal cells.
The types of cell which have a cell wall are: plant and bacterial.
The types of cell which have a plasmid are: bacterial.
The organelle found in all cells is: Ribosome.
The function of Ribosome: site of protein synthesis.
The students then measured cell sizes and calculated the average sizes.
Average size of cell (μm):
- Animal: 24
- Plant: 48
- Bacterial: 3
- Fungal: 7
The bar chart below shows the average size of the cells.
The diagram below represents a bacterial cell.
- X: Cytoplasm
- Y: Cell membrane
- Z: Genetic material
Difference: Bacterial cells have a cell wall, while fungal cells do not.
Similarity: Both bacterial and fungal cells have genetic material.
The diagram below shows two unicellular organisms.
A: Process mRNA synthesis
B: Process Protein synthesis
C: Process Photosynthesis
D: Process mRNa synthesis
E: Average length
F: Cell membrane
The diagram below shows a group of human cheek cells as seen under a microscope.
The actual diameter of the field of view was 2mm.
(1mm = 1000 micrometres)
The average length of the cells in micrometres is calculated as follows:
Average length = (1mm) * 1000 = 1000 micrometres.
A variegated leaf contains green areas and white areas.
The letter which identifies ribosomes is: G.
The evidence that this cell produces large quantities of ATP is the presence of numerous mitochondria.
The student's conclusion is correct because the cells from the green area contain chloroplasts responsible for producing ATP.
Transport across the Cell Membrane
Four cylinders of potato tissue were weighed and each was placed into a salt solution of a different concentration.
In which salt solution would most potato cells be plasmolysed?
The correct answer is: A.
The circles represent molecules on either side of a cell membrane.
In which of these diagrams would the molecules move into a cell by diffusion?
The correct answer is: C.
Which line in the table below identifies the direction of diffusion of the three substances during muscle contraction?
The correct answer is: B.
Which line in the table below summarises correctly the importance of diffusion to an animal cell in terms of raw materials gained and waste products removed?
The correct answer is: C.
A piece of potato was cut and weighed. It was placed in pure water for one hour then removed, dried and re-weighed. Finally, it was placed in a concentrated salt solution for one hour, removed, dried and weighed again.
The results most likely to be obtained by these treatments are:
- Mass after one hour in pure water: 6
- Mass after one hour in concentrated salt solution: 4
