10 questions🇬🇧English
🔬 Cell Structure & Microscopy – A-level
Biology · A-level — organelles, prokaryotes vs eukaryotes, microscopes, magnification and cell fractionation
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Questions
Which organelle produces most of the ATP in a eukaryotic cell during aerobic respiration?
Mitochondrion
Ribosome
Nucleolus
Golgi apparatus
20s
What type of ribosome is found in the cytoplasm of a bacterial cell?
60S
70S
90S
80S
20s
In microscopy, what is meant by resolution?
The brightness and contrast of the final image
How many times larger the image is than the object
The minimum distance at which two points appear separate
The maximum size of specimen that can be viewed
20s
Approximately what is the maximum resolution of a light microscope?
20 µm
0.2 µm
2 µm
0.2 nm
30s
The image of a cell is 25 mm long. The actual cell is 5 µm long. What is the magnification?
×500
×50 000
×5000
×5
30s
Why does a transmission electron microscope have a much higher resolution than a light microscope?
Electromagnets bend light more strongly than glass
The specimen is viewed inside a vacuum
The specimen is stained with heavy metals
Electrons have a much shorter wavelength than light
30s
In cell fractionation, why is the tissue homogenised in an ice-cold solution?
To prevent water moving into organelles by osmosis
To reduce the activity of enzymes that break down organelles
To keep the pH of the solution constant
To make organelles denser so they sediment faster
30s
Which statement is true of a scanning electron microscope but not of a transmission electron microscope?
It has a higher resolution
It can be used to view living specimens
Electrons pass through a very thin specimen
It produces a three-dimensional image of the surface
30s
In differential centrifugation of liver cells, nuclei form the first pellet. Which organelles form the next pellet?
Mitochondria
Golgi vesicles
Endoplasmic reticulum fragments
Ribosomes
30s
A mitochondrion 2 µm long is viewed at a magnification of ×12 000. How long is its image?
6 mm
2.4 mm
240 mm
24 mm
60s