Which cells in a plant are the ones that contain most chloroplast?
The cells in the leaf called mesophyll cells
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Suggest why muscle cells contain a lot of mitochondria, whereas most fat storage cells do not.
Muscle contraction requires a lot of energy in the form of ATP, whereas fat storage cells have very low energy requirements. (Fat cells that store brown fat have many mitochondria, as these cells use their fat to generate heat energy).
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What type of cells in plants and animals would contain extensive Golgi apparatus?
Cells that are responsible for the production of enzymes, hormones or growth regulators require processing and packaging, for export, in the Golgi apparatus.
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Why do sections of tissue need to be cut into thin slices for examination under a microscope?
Light can't penetrate thick slices of tissue, so no detail would be seen
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Suggest why light microscopes are so useful in biology.
The light microscope is easy to use and can be used to observe living cells such as single-celled organisms. It can also be used to observe the arrangements of tissues in organisms.
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Describe the main limitations of the electron microscope.
The inability to observe living material and the preparation processes required to observe specimens are the main limitations of the electron microscope
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Describe the limitations of the light microscope
Low resolution so cannot magnify much more x1500 and still give a clear image
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Suggest how flu viruses infect human cells of the respiratory tract
They are able to attach (by their surface antigens) to a normal cell surface protein receptor found in these cells
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Why can phospholipid molecules in a bilayer move only in the plane of the bilayer?
The phosphate head group cannot pass through the hydrophic region in the centre of the bilayer
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Why do muscle cells need to be able to take up glucose rapidly?
To support rapid respiration in order to supply ATP for contraction
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Why do we describe cell membranes as partially permeable rather than semi-permeable?
Diffrent membranes are permeable to a variety of substances and impermeable to a variety of other substances. Semi-permeable suggests 'half-permeable', which is unlikely to be the case in any membrane
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Other cards in this set
Card 2
Front
Which cells in a plant are the ones that contain most chloroplast?
Back
The cells in the leaf called mesophyll cells
Card 3
Front
Suggest why muscle cells contain a lot of mitochondria, whereas most fat storage cells do not.
Back
Card 4
Front
What type of cells in plants and animals would contain extensive Golgi apparatus?
Back
Card 5
Front
Why do sections of tissue need to be cut into thin slices for examination under a microscope?
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