Name two differences between animal and plant cells.
Animals have no chloroplasts as they don't photosynthesise, they don't cell walls because animals have skeletons
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What is a chloroplasts?
Absorbs light energy and converts it to glucose (chemical energy during photosynthesis)
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What is osmosis?
The net movement of water particles from a high concentration to a low concentration through a partially permeable membrane.
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Where could diffusion occur in a living system?
Alveolus allow oxygen to diffuse from them into the bloodstream.
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Where could osmosis occur in a non-living organism?
Visking tube
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What is active transport?
Uses energy from respiration to move substances up the concentration gradient through carrier proteins.
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Where could active transport occur?
Villi absorb sugar molecules during digestion.
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What are the chemical elements and monomers in a carbohydrate?
Carbon, oxygen, hydrogen. Monomers are glucose.
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What are proteins used for?
Hormones, antibodies, haemoglobin, enzymes
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What is an enzyme?
A protein that controls reactions in living organisms. they are called biological catalysts because they speed up reactions without being used up or changed. They can go on to catalyse another reaction.
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What factors affect enzymes?
pH, temperature
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Describe a test for glucose.
Benedict's reagent, water bath for 5 mins, brick red = glucose present
What effect does carbon dioxide have on photosynthesis?
It is a limiting factor. Photosynthesis rate will increase as the CO2 concentration does until CO2 is no longer a limiting factor. Light or temperature.
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Name two ways in which glucose is used after photosynthesis.
a) lipids (seeds) storage b) sucrose for transport
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How is a leaf adapted externally for photosynthesis?
Pores called stomata let gases in and out, petiole turns to face sunlight, thin to allow gases to reach all of leaf, large surface area for maximum absorption
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How is a leaf adapted internally for photosynthesis?
Spongy mesophyll airspace to allow diffusion of gases, lots of chloroplasts to absorb chloroplasts, transparent epidermis allows light in but is watrerproof too.
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Other cards in this set
Card 2
Front
Describe features of a protoctist.
Back
unicellular, nucleus, may have cell wall e.g. chorella
Card 3
Front
Name some viruses and their pathogenic values.
Back
Card 4
Front
Describe the levels of organisation in the reproductive system (female).
Back
Card 5
Front
Name two differences between animal and plant cells.
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