b4 - bioenergetics

Question 1

photosynthesis equation (word)

Answer 1

carbon dioxide + water – glucose + oxygen

Question 2

photosynthesis equation (symbols)

Answer 2

6CO2 + 6H2O – C6H12O6 + 6O2

Question 3

is photosynthesis endothermic or exothermic

Answer 3

endothermic because energy is transferred from the environment to the chloroplasts by light

Question 4

how does temperature effect photosynthesis

Answer 4

the higher the temperature the higher the rate of photosynthesis

Question 5

how does light intensity effect photosynthesis

Answer 5

the higher the light intensity the higher the rate of photosynthesis

Question 6

how does carbon dioxide concentration effect photosynthesis

Answer 6

the higher the carbon dioxide concentration the higher the rate of photosynthesis

Question 7

how does the amount of chlorophyll effect photosynthesis

Answer 7

the more chlorophyll = higher rate of photosynthesis

Question 8

uses of glucose from photosynthesis

Answer 8

• used for respiration
• converted into insoluble starch for storage
• used to produce fat or oil for storage
• used to produce cellulose, which strengthens the cell wall
• used to produce amino acids for protein synthesis

Question 9

is cellular respiration exothermic or endothermic

Answer 9

exothermic

Question 10

why do organisms need energy

Answer 10

• chemical reactions to build larger molecules
• movement
• keeping warm

Question 11

aerobic respiration word equation

Answer 11

glucose + oxygen – carbon dioxide + water

Question 12

aerobic respiration symbol equation

Answer 12

C6H12O6 + 6CO2 + 6H2O

Question 13

anaerobic respiration in muscles equation

Answer 13

glucose – lactic acid

Question 14

anaerobic respiration in plant and yeast cells equation

Answer 14

glucose – ethanol + carbon dioxide

Question 15

what is anaerobic respiration in yeast cells called

Answer 15

fermentation

Question 16

what is oxygen debt

Answer 16

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

Question 17

what is metabolism

Answer 17

the sum of all the reactions in a cell or the body

Question 18

what does metabolism include

Answer 18

• conversion of glucose to starch, glycogen and cellulose
• the formation of lipid molecules from a molecule of glycerol and three molecules of fatty acids
• the use of glucose and nitrate ions to form amino acids which
  in turn are used to synthesise proteins
• respiration
• breakdown of excess proteins to form urea for excretion