Bioenergetics

Question 1

What is the Photosynthesis reaction?

Answer 1

CO2 + H2O — C6H12O6 + O2

Question 2

What is a limiting factor?

Answer 2

Factor that stop the reaction going any faster is called the limiting factor EG, light intensity,co2,chlorphyll conc and temp

Question 3

What are the uses of Glucose?

Answer 3

Release energy in respiration

• Fats or oils which is stored in seeds
• Cellulose to strengthen walls
• Produce amino acids (plant needs to absorb nitrate ions from the soil)

Question 4

What is the equation for Aerobic respiration?

Answer 4

C6H12O6 + 02—CO2 + H2O

-a lot of energy released because glucose molecule has been fully oxidised

Question 5

What is the equation for Anaerobic respiration in

Muscle cells?

Answer 5

Glucose–Lactic acid

releases less energy because oxidation of glucose is incomplete

Question 6

What is anaerobic respiration called in yeast cells?

Answer 6

Anaerobic respiration in yeast cells is called fermentation
It is used in bread and alcohol

Question 7

What is metabolism?

Answer 7

Sum all chemical reaction in the cell or the body
they are controlled by enzymes and many need an energy transfer
-breakdown of excess proteins into urea for excretion

Question 8

What is photosynthesis and where is it taken place?

Answer 8

Photosynthesis takes in energy so it is an endothermic reaction
-Takes place in the leaves contain the green chemical chlorophyll which absorbs light energy

Question 9

How does light affect photosynthesis?

Answer 9

• Light intensity increases ,photosynthesis increases because more energy is bring provided
• After a certain point any increase in light has no effect

Question 10

How does carbon dioxide affect photosynthesis?

Answer 10

-CO2 increase photosynthesis increase because it is needed in the reaction after a certain point it has no effect

Question 11

How does chlorophyll conc affect photosynthesis?

Answer 11

LOW CONC-Leaves trap less light so low rate of photosynthesis
HIGH CONC-leaves trap more light so higher rate

Question 12

How does the rate of temp affect photosynthesis?

Answer 12

-increase temp the enzymes work faster and increase rate of photosynthesis BUT increasing the temp will denature enzymes and rate of photosynthesis falls

Question 13

What is the anaerobic equation for plant and yeas cells?

Answer 13

Glucose– ethanol + carbon dioxide