Biology B2

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  • Created by: Amy_5639
  • Created on: 09-04-18 14:27
1.Briefly describe the stages involved in the cell cycle.
1.Starts+ends with mitosis. 2.Cell grows,new cell structures+proteins made. 3.Synthesis-cell replicates its DNA,so when it splits during mitosis,the two new cells contain identical DNA. 4.Cells keep growing+proteins needed for cell division are made
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2.Explain why cells produced during mitosis are genetically identical.
1.Molecule of DNA splits. 2.Bases on nucleotides pair up with matching bases on the DNA. 3.Cross links form between new nucleotide bases+old DNA bases+new nucleotides join together. So two new DNA molecules identical to the original one are formed
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3.Give an example of a cell that is specialised to carry out a particular function.
Palisade leaf cells are specialised as they do most of the photosynthesis in plants.
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4.Give two differences between embryonic stem cells and adult stem cells in animals.
Embryonic stem cells are more versatile and adult stem cells are used to replace damaged cells whereas embryonic stem cells are used to turn into any kind of cell
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5.where are stem cells found in plants?
In plant tissues called meristems, which are found in the roots and shoots
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6.Give three substances that move across cell membranes by diffusion.
Glucose, amino acids, water and oxygen
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7.Explain how active transport is different from diffusion.
Diffusion=movement of particles from an area of higher concentration to an area of lower concentration whereas active transport=movement of particles across a membrane against a concentration gradient from an area of lower to higher concentration
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8.What is a partially permeable membrane?
One with very small holes in it. Only tiny molecules like water can pass through them
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9.What is osmosis?
The net movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration
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10.Give three factors that affect the movement of substances.
Surface area to volume ratio, temperature, concentration gradient
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11.Explain why single-celled organisms don't require specialised exchange surfaces and transport systems to exchange substances.
Only one cell big,substances can diffuse straight into and out of single-celled organisms.They have a large surface area to volume ratio meaning they're able to exchange enough substances across their cell membrane to supply the volume of the cell
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12.Give an example of a specialised exchange surface found in an animal and explain how it's adapted to maximise the exchange of substances.
The alveoli in the lungs.They have an enormous surface area , very thin walls, a moist lining for dissolving gases and a good blood supply. They are often ventilated too-air moves in and out
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13.Give two substances that a plant takes via its root hairs.
Water and minerals
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14.True or false? Humans have a single circulatory system.
False- they have a double circulatory system
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15How many chambers does the human heart have?
4
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16.Is blood in the pulmonary artery oxygenated or deoxygenated?
Deoxygenated
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17.Through which vessel dos blood leave the left ventricle of the heart?
Aorta
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18.Which type of blood vessel carries blood at high pressure?
Arteries
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19.What is the role of the plasma?
Plasma is blood without the red blood cells. It's a place yellow liquid that carries everything that needs transporting around your body
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20.What is the role of red blood cells?
They transport oxygen from the lungs to all the cells in the body
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21.What is translocation?
When phloem vessels transport food substances(mainly sugars) both up and down the stem to growing and storage tissues
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22.Which type of plant transport vessel contains sieve tube elements?
Phloem tubes
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23.What is carried by xylem tubes?
Water and minerals
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24.Which type of plant transport vessel is made up of dead cells?
Xylem tubes
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25.Give three factors that affect the rate of transpiration.
Increase in light intensity, temperature, air movement
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26.Where can most stomata be found?
On the lower surface of a leaf where it's darker and cooler
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27.Draw a diagram showing how a photometer can be used to investigate the rate of transpiration.
.
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Card 2

Front

2.Explain why cells produced during mitosis are genetically identical.

Back

1.Molecule of DNA splits. 2.Bases on nucleotides pair up with matching bases on the DNA. 3.Cross links form between new nucleotide bases+old DNA bases+new nucleotides join together. So two new DNA molecules identical to the original one are formed

Card 3

Front

3.Give an example of a cell that is specialised to carry out a particular function.

Back

Preview of the front of card 3

Card 4

Front

4.Give two differences between embryonic stem cells and adult stem cells in animals.

Back

Preview of the front of card 4

Card 5

Front

5.where are stem cells found in plants?

Back

Preview of the front of card 5
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