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Cell structure and transport
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Evaluate the use of an electron microscope and a light microscope, giving one example where each type of microscope might be used. (6 marks)
Evaluate the use of an electron microscope and a light microscope, giving one example where each typ...
Electron microscopes
magnify up to around ×2 000 000
have a resolving power of about 10 nm (scanning electron microscope)
or 0.2 nm (transmission electron microscope)
may be used to examine subcellular structures (e.g., chromosomes
during cell division)
light microscopes
magnify up to around ×2 000
have a resolving power of about 200 nm
may be used to look at cells dividing (e.g., stained onion cells)
Chloroplasts are found in many plant cells but not all of them. Suggest two types of plant cells that are unlikely to have chloroplasts and in each case explain why they have none.
Chloroplasts are found in many plant cells but not all of them. Suggest two types of plant cells tha...
Any two from:
• root cells – no exposure to light
• cells in centre of tree trunk – no exposure to light
• cells in flowers of plants – their function is not to
photosynthesise
Cone cells are specialised nerve cells in the eye. They contain a chemical that changes in coloured light. As a result of the change, an impulse is sent along another nerve cell to the brain. Cone cells usually contain many mitochondria. Suggest why this is an important adaptation. 4 marks
Cone cells are specialised nerve cells in the eye. They contain a chemical that changes in coloured ...
Transmitter chemicals
are required to pass impulse from cone cell to another nerve cell and
then on to brain.
The many mitochondria
supply energy from cellular respiration needed to make transmitter
chemicals.
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