Enzyme Basics
Enzyme Graphs & Experiments
Photosynthesis Basics
Chloroplast & Processes
Mixed
100
Enzymes belong to which category of organic molecules?
Proteins
100
What happens to enzyme activity at very high temperatures?
The enzyme denatures
100
Which organelle is responsible for photosynthesis?
Chloroplast
100
What part of the chloroplast contains the thylakoids stacked into grana?
Thylakoid membranes
100
Which stage of photosynthesis takes place in the stroma?
Calvin cycle (light-independent reactions)
200
What is the role of an enzyme’s active site?
Binds to the substrate
200
In an experiment, catalase breaks down hydrogen peroxide. Which products are released?
Water and oxygen
200
During which stage of photosynthesis is oxygen produced?
Light-dependent Reaction
200
What product of the light-dependent reactions is needed by the Calvin cycle?
ATP and NADPH
200
What does P and Q represent?
P- light-dependent reaction
Q- Calvin Cycle (light-independent reaction)
300
Identify a and c
a. enzyme
c. substrate
300
A graph shows enzyme activity vs. temperature. What is the optimum pH and temperature?
Temp 35-40
pH 7-8
300
What is the main product of the Calvin cycle?
Glucose
300
Which waste product of the light-dependent reactions is released into the atmosphere?
Oxygen
300
The light-dependent reactions create two energy-storing molecules. Name them.
ATP and NADPH
400
Why are enzymes specific for only one substrate?
The active site has a unique shape (lock-and-key)
400
What is happening to the enzyme at low temperature?
Molecules (enzyme and substrates) are moving slower causing less collisions so fewer products are produced
400
What is the overall photosynthesis equation.
CO2 + H2O (sunlight) → Glucose + O2
400
What do the light-dependent reactions and Calvin cycle have in common?
Both are needed for photosynthesis; products of one are used in the other.
400
Why are enzymes not considered reactants in a chemical reaction?
They speed up reactions but are not consumed.
500
Glucose isomerase converts glucose into fructose in the body. Can another enzyme perform the same reaction? Why/Why not?
No, enzymes are specific for their substrate.
500
At what pH do both enzymes work?
5.5
500
If photosynthesis stopped worldwide, what would happen?
No oxygen would be produced, no glucose would form, food chains would collapse, and most life would die.
500
In an experiment with pondweed, photosynthesis was fastest at 30°C. What does this suggest about temperature’s effect?
Photosynthesis has an optimal temperature; too low or too high slows the rate.
500
How do light and temperature interact to affect photosynthesis?
Both must be at optimal levels; insufficient light or extreme temperatures limit the rate.