bioenergetics Flashcards
Is photosynthesis exothermic or endothermic?
endothermic because energy is transferred from the environment.
What is the word equation for photosynthesis?
carbon dioxide + water
——————————->
glucose + oxygen
What is the symbol equation for photosynthesis?
6CO2 + 6H2O → C6H12O6 + 6O2
What are the five ways plants use glucose?
- for respiration
- making cellulose
- making amino acids
- stored as oils or fats
- stored as starch
What are amino acids made from?
glucose and nitrate ions
What affects the rate of photosynthesis?
- light intensity
- concentration of CO2
- temperature
How can chlorophyll be the limiting factor in photosynthesis?
amount of chlorophyll can be affected by disease or lack of nutrients SO less photosynthesis can occur as the plant can’t absorb as much light
What is the equation for light intensity?
1/distance^2
How can farmers artificially create the ideal conditions for farming?
- greenhouse- for heat
- artificial light- for light
- paraffin heater- for CO2
- fertilisers-for nutrients
What is respiration?
the process of transferring energy from glucose which goes on in every cell
Is respiration endothermic or exothermic?
exothermic because it transfers energy to the environment
How do organisms use the energy transferred by respiration?
- to build up larger molecules from smaller ones
- for muscles to contract
- to keep their body temperature steady in colder surroundings (in mammals and birds)
What can small glucose molecules form when joined together in reactions?
- starch
- glycogen
- cellulose
What are lipids from?
one molecule of glycerol and three fatty acids
What is metabolism?
all the chemical reactions in an organism
