BSCS Biology: A Molecular Approach

Chapter 5: Cell Respiration: Releasing Chemical Energy

Chapter Test

1.
Which metabolic pathway uses oxygen as the oxidizing agent?
A)aerobic respiration
B)anaerobic respiration
C)biosynthesis
D)glycolysis
2.
In what order do the stages of aerobic cellular respiration occur?
A)electron transport system, glycolysis, Krebs cycle
B)glycolysis, Krebs cycle, electron transport system
C)Krebs cycle, glycolysis, electron transport system
D)glycolysis, electron transport system, Krebs cycle
3.
What is the net gain of glycolysis?
A)two ATP molecules
B)three ATP molecules
C)38 ATP molecules
D)one ATP molecule
4.
What determines whether pyruvate enters into aerobic respiration or a fermentation process?
A)presence of sufficient mitochondria
B)availability of sufficient glucose
C)presence of lactate
D)availability of sufficient oxygen
5.
Which of the following is not a product of the Krebs cycle?
A)acetyl CoA
B)carbon dioxide
C)NADH
D)ATP
6.
Which of the following best describes organisms that can survive with or without oxygen?
A)obligate aerobes
B)obligate anaerobes
C)facultative aerobes
D)facultative anaerobes
7.
What is a primary difference between cellular respiration and photosynthesis?
A)Carbohydrates are oxidized by cellular respiration and water is oxidized by photosynthesis.
B)Carbon skeletons are provided by cellular respiration and used by photosynthesis.
C)Cellular respiration uses the electron transport system to form ATP and photosynthesis uses fermentation to form ATP.
D)Cellular respiration reduces carbon dioxide and photosynthesis reduces oxygen.
8.
The Krebs cycle is ____.
A)involved in the breakdown of carbohydrates and proteins.
B)involved in the breakdown of carbohydrates only.
C)involved in the breakdown of carbohydrates, proteins, and fats.
D)involved only after glycolysis takes place.
9.
What is the role of brown fat in some mammals?
A)to store extra mitochondria
B)to produce extra ATP
C)to store extra fatty acids
D)to produce thermal energy quickly
10.
What determines the rate of biosynthesis and decomposition?
A)external temperature
B)internal temperature
C)supply and demand
D)the Krebs cycle
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