Biogenetics

Question 1

What does the chemical symbol C6H12O6 represent

Answer 1

Glucose

Question 2

What is meant by a limiting factor for the rate of photosynthesis

Answer 2

A factor that stops photosynthesis happening any faster

Question 3

Explain why the rate of photosynthesis decreases if the temperature is too high

Answer 3

Enzymes become denatured so the rate of photosynthesis rapidly decreases

Question 4

What could you measure to show the rate of photosynthesis

Answer 4

Oxygen production

Question 5

What is the inverse square law for light intensity

Answer 5

1➗distance2

Question 6

Why might a farmer want to increase the rate of photosynthesis in her green house of tomatoes

Answer 6

So they grow bigger and be can sold for a bigger profit

Question 7

Give two examples of how animals use the energy transferred by respiration

Answer 7

To contract muscles

To regulate body temperature

Question 8

What is metabolism

Answer 8

The sum of all reactions that happen in a cell or the body

Question 9

What are the reactants of aerobic respiration

Answer 9

Glucose and oxygen

Question 10

What is the process of anaerobic respiration in a yeast called

Answer 10

Fermentation

Question 11

State three changes that take place in the body during vigorous exercise

Answer 11

Breathing rate increases breath volume increases and heart rate increases

Question 12

Where in a plant cell does photosynthesis take place

Answer 12

The chloroplasts

Question 13

How is energy transferred to a plant from its environment for photosynthesis

Answer 13

Light energy is transferred to the chloroplasts from the environment

Question 14

What is an endothermic reaction

Answer 14

Taking in heat from surroundings

Question 15

Name the products of photosynthesis

Answer 15

Glucose and oxygen

Question 16

What type of molecule is formed from combining glucose molecules with nitrate ions

Answer 16

Makes amino acids which makes protein molecules

Question 17

Why do plants store glucose as starch

Answer 17

So it’s ready for use when there is a decrease is photosynthesis or when it can’t happen eg winter

Question 18

What effect would a low carbon dioxide concentration have on the rate of photosynthesis

Answer 18

Photosynthesis would decrease as it’s needed to carry out photosynthesis

Question 19

What effect would very low temperature have on the rate of photosynthesis

Answer 19

Photosynthesis would decrease because the enzymes are denatured

Question 20

Describe a method that could be used to measure the effect of light intensity on the rate photosynthesis

Answer 20

1) put a source of light at a distance away from pond weed
2) leave be pond weed to photosynthesise so oxygen can be produced and go into the capillary tube
3) measure the size of the bubble using a ruler in the syringe
4) control variables such as temperature and time
5) repeat at different distances

Question 21

In the inverse square law how are light intensity and distance linked

Answer 21

As distance increases light intensity decreases so they are inversely proportional

Question 22

Give one way that the temperature can be decreased in a green house

Answer 22

Use shades and ventilation to decrease temperature

Question 23

Give one way that the level of carbon dioxide can be increased in a green house

Answer 23

Use a paraffin heater

Question 24

What is respiration

Answer 24

The process of transferring energy for glucose which goes into every cell

Question 25

What is an exothermic reaction

Answer 25

A reaction that gives out energy

Question 26

What process transfers energy to make new molecules in cells

Answer 26

Respiration

Question 27

Give three examples of metabolic reactions

Answer 27

Lots of small glucose molecules joining together to form starch
Glycerol and three fatty acids join up to make a lipid
Glucose is combined with nitrate ions to make proteins

Question 28

Name the products of aerobic respiration

Answer 28

Carbon dioxide and water

Question 29

What is produced by anaerobic respiration in muscle cells

Answer 29

Latic acid

Question 30

What is the word equation for anaerobic respiration in yeast cells

Answer 30

Glucose ➡️ ethanol + carbon dioxide

Question 31

Name two of the products of the food and drink industry that fermentation is needed for

Answer 31

Ethanol is used for alcohol

Carbon dioxide is used to make bread to make it rise

Question 32

What happens to the muscles when they become fatigued

Answer 32

Latic acid builds up in the muscles which is painful

Question 33

In what organ is Latic acid converted back to glucose

Answer 33

Liver