Science M3

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B3- Where does respiration take place?
Mitochondria- respiration supplies energy for the cell. Cells that have a high energy requirement e.g. muscle cells have large amounts of mitochondria.
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B3- How do the four bases in DNA pair up?
A-T and G-C. This is complementary base pairing.
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B3- What is the word equation for aerobic respiration?
glucose + oxygen => carbon dioxide + water (+energy released)
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B3- What is produced during anaerobic respiration?
Lactic acid- toxic to cells, cause cramp and fatigue.
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B3- What are gametes?
Sex cells (egg&sperm). These are haploid so they only have half the amount of chromosomes.
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B3- In which organs does meiosis occur?
Testes and Ovaries
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B3- What is mitosis and meiosis?
Mitosis- produces new cells for growth. Meiosis- cells in testess and ovaries divide to produce gametes for sexual reproduction(introduces genetic variation).
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B3- Name the four components of blood.
Plasma, Platelets, Red blood cells, White blood cells.
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B3- What does the pulmonary artery do?
Takes blood from the heart to the lungs to pick up oxygen.
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B3- Name the process of producing organisms with desired characteristics through a breeding programme.
Selective breeding. *intensive selective breeding reduces gene pool, number of different allelles in population decrease= less variation. This can lead to harmful recessive characteristics.
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B3- What is gene therapy?
Changing a persons genes in order to cure genetic disorders.
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B3- How has genetic engineering helped people people with diabetes?
The production of human insulin by genetically engineered bacteria.
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B3- Suggest some possible uses for cloning.
Mass production of animals with desirable characteristics, Producing lots of animals which produce a human product, Producing human embryos to supply stem cells for therapy
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Chemistry- What are the negative particles in an atom called?
Electrons
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Chemistry- Where are the proton and neutrons found in an atom?
Nucleus
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Chemistry- What is an ion?
A charged atom or group that has lost or gained electrons.
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Chemistry- What 3 things can displayed formula tell you?
The different types of atom found in a compound, the number of each type of atom, where the bonds are in a compound.
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C3- What is rate of reaction?
A measure of the amount of product made in a specific time.
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C3- How can rate of reaction be increased?
Increase temperature, concentration(for reactants in solution), pressure(for reactants that are gases) or add a catalyst.
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C3- How does temperature increase the rate of reaction?
The reactant particles have more kinetic energy and move around faster, making them more likely to collide and collisions are higher energy making them more likely to form a product.
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C3- What is the process of making bonds called?
ENDOTHERMIC- chemical reactions that need more energy to break bonds than released when new bonds are made are endothermic reactions.
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C3- What is the process of breaking bonds called?
EXOTHERMIC- chemical reactions that release more energy when making bonds than breaking them are exothermic reactions.
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C3- What are the 4 stages for extracting chemicals from plants?
Crushing, boiling, dissolving and chromatography.
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C3- Name 3 allotropes of carbon.
Diamond, graphite and Buckminster fullrene.
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P3- What 2 quantities are needed to calculate speed?
distance&time
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P3- What does the gradient of a dt graph represent?
Speed
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P3- State the equation used to calculate acceleration.
A(m/s2) = Change in speed(m/s) / Time taken for change(s)
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P3- What does the acceleration of -5m/s2 tell you about the motion of the object?
Slowing down- deceleration
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P3- What are the main features of cars designed to prevent accidents?
ABS, traction control, cruise control, paddle shifts.
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P3- What feature on a lorry reduces air resistance?
A deflector.
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P3- How does an increase in collision time affect the force felt by the driver?
It decreases.
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P3- Which 2 forces on a skydiver are equal when falling at terminal speed?
Weight and air resistance.
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P3- When an object falls at terminal speed, what happens to its kinetic energy?
Stays the same- the speed isn't changing so the KE doesn't increase.
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P3- What happens to the size of the KE of an object if its speed is doubled?
It quadruples.
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Card 2

Front

B3- How do the four bases in DNA pair up?

Back

A-T and G-C. This is complementary base pairing.

Card 3

Front

B3- What is the word equation for aerobic respiration?

Back

Preview of the front of card 3

Card 4

Front

B3- What is produced during anaerobic respiration?

Back

Preview of the front of card 4

Card 5

Front

B3- What are gametes?

Back

Preview of the front of card 5
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