Respiration and photosynthesis

Written by Dr. Hira Salman (Biology)

MDCAT · Biology · 8 questions

Name: ____________________ Date: ____________

Where does glycolysis take place in a cell?
- A Cytoplasm
- B Nucleus
- C Mitochondrial matrix
- D Inner mitochondrial membrane
What is the net gain of ATP from glycolysis of one glucose molecule?
- A 36
- B 4
- C 2
- D 38
What is the final electron acceptor in aerobic respiration?
- A Oxygen
- B NAD+
- C Carbon dioxide
- D Water
The Krebs cycle takes place in the:
- A Cytoplasm
- B Outer mitochondrial membrane
- C Mitochondrial matrix
- D Golgi apparatus
Alcoholic fermentation in yeast produces:
- A Acetic acid and water
- B Ethanol and oxygen
- C Lactic acid only
- D Ethanol and carbon dioxide
The oxygen released during photosynthesis comes from:
- A Chlorophyll
- B Carbon dioxide
- C Glucose
- D Water
Which products of the light reactions are used to run the Calvin cycle?
- A ATP and NADPH
- B ADP and NADP+
- C Pyruvate and NADH
- D Glucose and oxygen
How many carbon atoms does a molecule of pyruvate have?
- A 2
- B 4
- C 3
- D 6

Answer key

1. A, 2. C, 3. A, 4. C, 5. D, 6. D, 7. A, 8. C

Glycolysis happens in the cytoplasm and does not need oxygen. It splits glucose into two molecules of pyruvate.
Glycolysis uses 2 ATP and makes 4, so the net gain is 2 ATP.
Oxygen accepts the electrons at the end of the electron transport chain and is reduced to water.
The enzymes of the Krebs cycle are in the fluid matrix inside the mitochondrion.
Pyruvate is converted to ethanal, and then to ethanol. Carbon dioxide is released in the first step.
Water is split by light in photolysis. This was shown by experiments with heavy oxygen.
The light reactions make ATP and NADPH, which supply the energy and reducing power for fixing carbon dioxide.
Glucose has six carbons, and glycolysis splits it into two three-carbon molecules of pyruvate.