Bioenergetics Flashcards
What is the equation for photosynthesis?
Light
Carbon Dioxide + water————-> Glucose + Oxygen
What type of reaction of is photosynthesis?
Photosynthesis is an endothermic reaction in which energy is transferred from the environment to the chloroplasts by light.
What are the three limiting factors of photosynthesis
Temperature, Concentration of carbon dioxide, Light intensity.
What is he sample method of the photosynthesis practical?
1) Place a piece of pondweed in a beaker and shine a light at it using a lamp a specific distance away.
2) Record the number of bubbles of gas coming out of the pondweed in one minute
3) Repeat this with the lamp at different distances from the pondweed.
What are the variables in the photosynthesis practical?
Independent variable= light intensity
Dependent variable= number of bubbles in one minute
Control variable= Temperature, concentration of carbon dioxide and the piece of pondweed
What is the inverse square law?
When the light intensity is studied doubling the distance between the lamp pondweed will reduce the light intensity by a quarter.
When is the glucose produced by the plant may be used?
It may be used during respiration to provide energy.
What products can glucose be changed into?
1) Insoluble starch, which is stored in the stem, leaves, or roots.
2) Fat or oil, which is also stored e.g., in seeds
3) Cellulose to strengthen the cell walls
4) Proteins, which are used for growth and for enzymes.
What do plants use to produce proteins from glucose?
Plants use nitrate ions which are absorbed from the soil.
How does our body respond to exercise?
The heart rate, breathing rate, and breath volume increase during
exercise to supply the muscles with more oxygenated blood.
When does anaerobic respiration take place?
If insufficient oxygen is supplied anaerobic respiration takes place in
muscles
What does incomplete oxidation of glucose cause?
The incomplete oxidation of glucose causes a build-up of lactic acid and creates an oxygen debt.
What happens to your muscles during vigorous periods of long activity?
During long periods of vigorous activity, muscles become fatigued and stop contracting efficiently.
What happens to lactic acid flowing through our blood?
Blood flowing through the muscles transports the lactic acid to the liver where it is converted back into glucose.
What is oxygen debt?
Oxygen debt is the amount of extra oxygen the body needs after exercise to react with the lactic acid and remove it from the cells.
