Biology- Revision question for topic one page 23

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  • Created by: emj790
  • Created on: 04-02-17 13:20
What is the function of the cell membrane?
Holds the cell together and controls what goes in and out
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Give three structures found in plant cells but not in animal cells
Vacuole, Cell wall, Chloroplasts
2 of 28
Name the subcellular structures in plant cells where photosynthesis takes place
Chloroplasts
3 of 28
Name two structures that are found in both prokaryotic and eukaryotic cells
Ribosomes, cell membrane
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What does the term "Haploid" mean?
A cell that only contains half the number of chromosomes that's in a normal body cell (23 not 46)
5 of 28
Give three ways in which the egg cell is adapted to its function
It contains nutrients in the cytoplasm, it has a haploid nucleus and the cell membrane hardens after fertilisation
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What are cilia?
They are hair-like structures on the top surface of the cell
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What is the purpose of the ciliated epithelial cells that line the airways?
It is move substances in one direction, along the surface of the tissue
8 of 28
Give an advantage of electron microscopes over light microscopes
They have a higher magnification and resolution
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Why is it necessary to use thin samples of tissue when viewing cells using a light microscope?
So that the light can get through the sample
10 of 28
Equation to find the size of a specimen using the magnification used and the size of the image seen through lens
Magnification= image size / real size
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Decribe how you would convert a measurement from mm to micrometres?
Multiply it by 1000
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Which unit can be expressed in standard form as x 10^(-12)m?
Picometre (pm)
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What part of an enzyme makes it specific to a particular substance?
The active site
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Why can denatured enzymes no longer catalyse chemical reactions?
The bonds holding the enzyme together break and it changes the shape of the active site
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Explain how temperature affects enzyme activity
It increases the rate of an enzyme-catalysed reaction, but if it goes past the optimum temperature the enzymes denature and the rate does down again
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Decribe how you could investigate the effect of pH on the rate of Amylase activity
Heat until 35degrees, add starch and every 10secs sample it by adding a drop of iodine(it reacts to starch) until the colour remains browny-orange measure the time (you can repeat it with a different pH of the buffer solution)
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Which two molecules are produced when lipids are broken down?
Glycerol and fatty acids
18 of 28
Name a big molecule that's formed from simple sugars
Carbohydrates
19 of 28
Describe the colour change that occurs when Benedict's reagent is added to a substance containing reducing sugars
Blue to green to yellow to orange to brick red
20 of 28
What chemical reagent is used to test for the presence of starch?
Iodine solution
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How would you test for the presence of lipids in a sample?
Shake the test substance with ethanol until it dissolves, then pour it into water; milky colour indicates lipid
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Describe briefly how you could use calorimetry to measure the energy content of a peanut
Set fire to the peanut and put it under boiling tube (water filled) keep relighting peanut until it doesn't set on fire and then measure the temp of the water
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Define diffusion
The net (overall) movement of particles from an area of higher concentration to an area of lower concentration
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Define osmosis
The net (overall) movement of water molecules across a partially permeable membrance from a region of higher water concentration to a region of lower water concentration
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Define active transport
The movement of particles across a membrane against a concentration gradient using energy transferred during respiration
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If a potato cylinder is placed in a solution with a veryhigh sucrose concentration, what will happen to the mass of the potato cylinder over time?
The mass of the cylinder decreases
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Explain why
the water concentration is less in the solution than in the cylinder so it goes across the partially permeable membrane
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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

Vacuole, Cell wall, Chloroplasts

Card 3

Front

Name the subcellular 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 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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