SB1 Revision Questions

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  • Created by: lx1234
  • Created on: 02-04-18 16:21
What is the function of the cell membrane?
Controls movement of particles in and out of the cell
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Give three structures found in plant cells but not in animal cells
Large Vacuole, Chloroplasts, Cell Wall
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Name the sub-cellular structures in plant cells where photosynthesis takes place
Chlorophyll
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Name two structures that are found in both prokaryotic cells and eukaryotic cells
Cell membrane, cytoplasm
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What does the term haploid mean?
Half the amount of chromosomes in the nucleus
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Give three ways in which the egg cell is adapted to its function
Haploid nucleus, nutrients in the cytoplasm to feed embryo, membrane structure changes to prevent more sperm entering.
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What are cilia?
Small, hair like structures on the surface of the cell that sweep hair, mucus, bacteria and trapped dust away.
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What is the purpose of the ciliated epithelial cells that line the airways?
Sweeps away mucus that lines the airways
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Give an advantage of electron microscopes over light microscopes
Electron microscopes have a higher magnification and resolution, so you can see smaller things in more detail
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Why is it necessary to use thin samples of tissue when viewing cells using a light microscope?
So light can pass through it
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What is the equation for total magnification?
eyepiece lens magnification x objective lens magnification
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What is the equation for magnification?
magnification=image size/real size
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Describe how you would convert a measurement from mm to μm (micrometres)
x1000
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What part of an enzyme makes it specific to a particular substrate?
Active site
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Why can denatured enzymes no longer catalyse chemical reactions?
The active site has changed shape, so the substrate no longer matches it.
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Explain how temperature affects enzyme activity
A higher temperature increases the rate of activity, but if it gets too hot, the bonds holding the enzyme together break, changing the shape of the active site, so the substrate wont fit anymore.
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Describe how you could investigate the effect of pH on the rate of amylase activity
A drop of iodine into every well of a spotting tile, Set up a bunsen burner and place a beaker of water ontop of the tripod and heat it to 35, add 3cm² of amylase solution, and 1cm² of buffer solution with pH 5, add 3cm² of starch, mix solution, time
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Which two molecules are produced when lipids break down?
Fatty acids and fats.
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Name a big molecule thats formed from simple sugars.
Glucose or Fructose.
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Describe the colour change that occurs when Benedict's reagent is added to a substance containing reducing sugars?
The higher the concentration of reducing sugar, the further the colour change. (Blue, green, yellow, orange, brick red)
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What chemical reagent is used to test for the presence of starch?
Iodine
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How would you test for the presence of lipids in a sample?
Ethanol
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Describe briefly how you could use calorimetry to measure the energy content of a peanut.
Weigh a small amount of the peanut, skewer it on a mounted needle, add a set volume of water to a boiling tube, measure temp then set fire to the food using Bunsen Burner flame, hold burning food under the boiling tube until it goes out, repeat.
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Define the following terms: diffusion, osmosis and active transport.
diffusion: the movement of particles from high to low conc. osmosis: the movement of water particles from low conc to high through semi permeable membrane. active transport: movement of particles from low to high conc.
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Other cards in this set

Card 2

Front

Give three structures found in plant cells but not in animal cells

Back

Large Vacuole, Chloroplasts, Cell Wall

Card 3

Front

Name the sub-cellular structures in plant cells where photosynthesis takes place

Back

Preview of the front of card 3

Card 4

Front

Name two structures that are found in both prokaryotic cells and eukaryotic cells

Back

Preview of the front of card 4

Card 5

Front

What does the term haploid mean?

Back

Preview of the front of card 5
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