B4 - Bioenergetics

Question 1

word equation of photosynthesis

Answer 1

light
carbon dioxide + water —> glucose + oxygen

Question 2

which type of reaction is photosynthesis

Answer 2

endothermic reaction

Question 3

where is energy transferred to and from in photosynthesis

Answer 3

the environment to the chlorpolasts by light

Question 4

how does tempreature affect the rate of photosynthesis

Answer 4

too low - enzymes needed for photosynthesis work slower at a lower temp

too high - the enzymes needed will be damaged

Question 5

what tempreature is normaly too hot for photosynthesis

Answer 5

45

Question 6

how does carbon dioxide affect the rate of photosynthesis

Answer 6

more carbon dioxide is faster photosynthesis

Question 7

how can light affect photosynthesis

Answer 7

as if there isnt enough light, the rate slows down

Question 8

what things may the glucose made from photosynthesis be used for

Answer 8

respiration
converted into insoluble starch for storage
produce fat or oil for storage
produce cellulose to strenghthen cell wall
produces amino acids for protein synthesis

Question 9

what type of reaction is cellular respiration

Answer 9

exothermic

Question 10

when does cellular respiration occur

Answer 10

constantly in living cells

Question 11

what is repsiration

Answer 11

transferring energy from glucose which goes on in every cell

Question 12

symbol equation for aerobic respiration

Answer 12

C6H12O6 +6O2 —->6CO2 +6H20

Question 13

word equation for aerboic respiration

Answer 13

glucose + oxygen —>carbon dioxide + water

Question 14

word equation for anarobic respiration

Answer 14

glucose —> lactic acid

Question 15

differences between aerobic and anerobic respiration

Answer 15

aerobic requires oxygen and anaerobic doesnt
aerobic makes carbon dioxide and water anaerboic makes lactic acid
aerobic transfers more energy

Question 16

what do organisms need energy for

Answer 16

chemical reactions to build larger molecules
movement
keeping warm

Question 17

why is the amount of energy transferred by anaerobic respiration much less than aerobic

Answer 17

as the oxidation of glucose is incomplete

Question 18

what is anerboic respiration called in yeast cells

Answer 18

fermentation

Question 19

word equation for fermentation

Answer 19

glucose —> ethanol + carbon dioxide

Question 20

what is fermentation used to make

Answer 20

bread
alchoholic drinks

Question 21

how does the human body react to the increase in demand for energy during exercise

Answer 21

heart rate, breathing rate, breath volume increase to supply the muscles with more oxygenated blood

Question 22

what is oxygen debt

Answer 22

the amount of extra oxygen needed after exercise to react with the accumulated lactic acid and remove it from cells

Question 23

what does the liver turn lacitc acid to

Answer 23

glucose

Question 24

what is metabolism

Answer 24

the sum of all the reactions in a cell or body

Question 25

give examples of reactions where larger molecules are made from smaller ones

Answer 25

glucose joined to make starch, glycogen and cellulose
lipid made from one molecule of glycerol and three fatty acids
glucose and nitrate ions make amino acids

Question 26

examples of where smaller molecules are made from larger ones

Answer 26

glucose broken down
excess protein broken down to urea