B1.3 - Respiration Flashcards Preview

OCR A GCSE Biology (B1-B3) > B1.3 - Respiration > Flashcards

Flashcards in B1.3 - Respiration Deck (28)
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1
Q

What is meant by the term metabolic rate?

A

The speed in which chemical reactions in your cells transfer energy from its chemical stores in food

2
Q

what is the use of vitamins and minerals in the body?

A

A variety of roles - mainly to maintain overall good health

Ie. Maintain heartbeat, build strong boned, transmit nerve impulses

3
Q

Explain the importance of sugars in:

(a) the body

A

(a) they provide the body with energy

4
Q

Explain the importance of animo acids in the synthesis of proteins

A

animo acid monomers join together to make protein polymers

5
Q

when fungi respire anaerobically is it

  • exothermic
  • or endothermic
A

exothermic

6
Q

What enzyme breaks down carbohydrates?

A

carbohydrase

starch = amylase

7
Q

What determines the protein that is synthesised?

A

The order in which animo acids are joined together

8
Q

what enzyme breaks down protein molecules?

A

protease

9
Q

what enzyme breaks down lipid molecules?

A

lipase

10
Q

once food molecules are fully digested, what happens to them?

A

1) they are absorbed into your bloodstream

2) and then travel to the cells that need them

11
Q

state the word equation for aerobic respiration

A

oxygen + glucose ——> carbon dioxide + water

12
Q

state the chemical equation for aerobic respiration

A

C6H12O6 + 602 -> 6CO2 + 6H20

13
Q

why does aerobic respiration occur?

A

To react glucose with oxygen so energy can be released (or stored as ATP)

14
Q

What is ATP?

A
  • Adenosine Triphosphate

- a chemical energy store in the body

15
Q

How is ATP used once produced during respiration? (3)

A
  • to synthesise larger molecules from smaller ones (to make new cell material) - ie. larger substrates
  • for movement
    ie. animals use ATP to contract muscle cells
  • to stay warm
    ie. an increased rate of reaction allows more energy by heating (keep body warm)
16
Q

Where does respiration occur?

A

In the mitochondria of a cell

17
Q

what does the number of mitochondria in a cell show, and what does it mean for muscle cells?

A

how active the cell is

Since muscle cells have a lot of mitochondria, it means they are very active (as they contract very often and so have to transfer a lot of energy)

18
Q

how are mitochondria adapted to efficiently respire?

A
  • they have folded inner membrane which gives a large surface area
19
Q

state the word equation for anaerobic respiration in animals

A

glucose —-> lactic acid

20
Q

state the word equation for anaerobic respiration in plants and bacteria

A

glucose ——> ethanol + carbon dioxide

21
Q

State one advantage of respiring aerobically compared to anaerobically

A

more ATP is produced during anaerobic respiration

22
Q

State one disadvantage of respiring anaerobically

A

lactic acid is produced - which causes pain and stops the muscle from contracting (known as fatigue)

23
Q

what is oxygen debt?

A

when extra oxygen inhaled is required to break down lactic acid (produced by anaerobic respiration)

24
Q

state one similarity and three difference between anaerobic respiration in plants and in animals

A
  • both have glucose as a reactant
  • Plants do not produce lactic acid, they produce ethanol
    or
  • plants produce carbon dioxide as a product, animals do not in anaerobic respiration
    or
  • buildup of ethanol can kill plants, build up of lactic acid cannot kill animals (only muscle cramps)
25
Q

state the difference between a monomer and a polymer

A

a monomer is made from single units and a polymer is made from multiple bonded units

26
Q

how many more molecules of ATP are produced by aerobic respiration compared to anaerobic respiration?

A

36

27
Q

Is cellular respiration exothermic or endothermic?

and why

A

Exothermic

- body heats up by itself (as respiration is constantly occurring)

27
Q

Give an example of anaerobic respiration in plants/bacteria

A
  • fermentation

- yeast blooming