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Biology > Biogenergetics > Flashcards

Biogenergetics Flashcards

1
Q

What is aerobic respiration?

A

When sugar glucose is reacted with oxygen.

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2
Q

What is the word equation for aerobic respiration?

A

glucose + oxygen ——> carbon dioxide + water (+energy)

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3
Q

Why does aerobic respiration release a great deal of energy?

A

As the glucose molecule has been FULLY OXIDISED.

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4
Q

What is anaerobic respiration?

A

When there is a SHORTAGE OF OXYGEN cells respire anaerobically.

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5
Q

What is the word equation for anaerobic respiration in muscles?

A

glucose ——> lactic acid

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6
Q

Why does anaerobic respiration release much less energy?

A

As the oxidation of glucose is INCOMPLETE.

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7
Q

What is the word equation for anaerobic respiration in plant cells and yeast?

A

glucose ——> ethanol + carbon dioxide

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8
Q

What reaction is aerobic respiration an example of?

A

EXOTHERMIC, as it is releasing energy.

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9
Q

What do plants use for their source of energy?

A

Light.

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10
Q

What reaction is photosynthesis an example of?

A

ENDOTHERMIC, as photosynthesis TAKES in energy.

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11
Q

Where does photosynthesis take place in plants?

A

In the LEAVES.

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12
Q

What green chemical do the leaves of a plant contain?

A

Chlorophyll.

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13
Q

What is the role of chlorophyll?

A

Absorb sunlight energy.

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14
Q

What is the word equation for photosynthesis?

A

Carbon dioxide + water ——> glucose + oxygen

6CO.. + 6H..O ——> C..H..O.. + 6O..

……..2……….2………………6…12..6………2

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15
Q

What happens to the rate of photosynthesis as you increase the light intensity?

A

Increases, however, there comes a point where the rate NO LONGER INCREASES .

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16
Q

Why does the rate of photosynthesis stop increasing with the increase of light intensity?

A

As something else is now in short supply e.g. level of CO2 (LIMITING FACTOR).

17
Q

What happens to the rate of photosynthesis as you increase the temperature?

A

INCREASES, as the enzymes work faster. However, if we keep increasing temperature enzymes will DENATURE (DECREASING the rate).

18
Q

Describe a method to see how pond weed is affected by light intensity.

A
  1. Fill the beaker with water, put the pond weed in the beaker.
  2. Move the light close to the pond weed, Count amount of BUBBLES produced in one minute/measure oxygen produced.
  3. Repeat experiment but move the light closer/further away from the pond weed each time.
  4. To make it a fair test, use same AMOUNT OF WATER, same LENGTH/VOLUME of POND WEED and TIME for one min.
19
Q

What is meant by inverse square law?

A

For instance, if you DOUBLE the DISTANCE, the LIGHT INTENSITY will HALVE (vice versa).

20
Q

What is the role of the xylem?

A

Transports water in the transpiration system

21
Q

What is the role of the pholem?

A

It transports dissolved sugars using translocation.

Biology (8 decks)

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