CELLULAR RESPIRATION QUESTIONS:
C 6 O12 6O + AD2 + P i 6CO +26 H O 2 MOLECULE A
The process shown in the equation above begins in the cytoplasm of a cell and ends in the
a. cytoplasm. b. endoplasmic reticulum. c. mitochondria. d. lysosome.
The equation above summarizes the process known as
a. photosynthesis. b. cellular respiration. c. fermentation. d. protein breakdown.
The molecule referred to as “molecule A” in the equation above is
a. NADPH. b. NADH. c. ATP. d. ADP.
When living cells break down molecules, energy is
a. stored as ADP. c. released as heat.
b. stored as ATP. d. Both b and c
In cellular respiration, the most energy is transferred during
b. lactic acid fermentation.
c. the Krebs cycle.
d. the electron transport chain
Electrons are donated to the electron transport chain by
a. ATP and NADH. c. ATP and NAD+.
b. FADH2 and NADH. d. NAD+ and ATP.
If the formation of 38 molecules of ATP requires 266 kcal of energy and the complete oxidation of glucose
yields 686 kcal of energy, how efficient is cellular respiration at extracting energy from glucose?
a. 20% b. 25% c. 39% d. 100%
Glycolysis begins with glucose and produces
a. PGAL b. lactic acid c. acetyl CoA d. pyruvate
An important molecule generated by both lactic acid fermentation and alcoholic fermentation is
a. ATP b. NADH c. CO2 d. NAD+
In the first step of aerobic respiration, pyruvate from glycolysis produces CO2, NADH, H+, and
a. citric acid b. acetyl CoA c. oxzloacetic acid d. lactic acid
The electron transport chain is driven by two products of the Krebs cycle-
a. oxaloacetic acid and citric acid c. NADH and FADH2
b. H2O and CO2 d. acetyl CoA and ATP
In alcoholic fermentation, ethyl alcohol is produced from
a. NAD+ b. NADH c. lactic acid d. pyruvic acid
a. contain five phosphate groups
b. is essential for a cell to perform all the task necessary for life
c. is found only in bacteria
d. All of the above. You have been growing some animal cells in culture. The cells grow well for several weeks, and then their
growth slows down. You conduct some tests and determine that there is a lot of lactic acid in the culture
fluid. Which of the following is the most likely explanation for the poor growth of the cells?
a. There is too much glucose in the culture fluid.
b. There is not enough glucose in the culture fluid.
c. There is too much oxygen in the culture fluid.
d. There is not enough oxygen in the culture fluid.
In cellular respiration, a two-carbon molecule combines with a four-carbon molecule to form citric acid as
b. carbon fixation.
c. the Krebs cycle.
d. the electron transport chain.
Acetyl coenzyme A
a. is formed from the breakdown of pyruvate
b. enters the Krebs cycle.
c. can be used in synthesis of needed molecules.
d. All of the above
Glycolysis and aerobic respiration are different in that
a. glycolysis occurs on the cell membrane, while aerobic respiration occurs in mitochondria.
b. glycolysis occurs only in photosynthesis, while aerobic respiration is part of cellular respiration.
c. glycolysis occurs in the absence of oxygen, while aerobic respiration requires oxygen.
d. There is no difference; these terms are different names for the same process.
Which of the following is not formed during the Krebs cycle?
a. CO2 b. NADH c. FADH2 d. NADPH
Which of the following is not part of cellular respiration?
a. electron transport b. the Krebs cycle c. glycolysis d. the Calvin cycle
Water is an end product in
a. lactic acid formation. c. the Krebs cycle.
b. fermentation. d. the electron transport chain.
ATP molecules produced during aerobic respiration
a. remain in the mitochondria in which they are formed.
b. are stored in chloroplasts of the same cell in which they are formed.
c. enter the cell’s cytoplasm through the membranes of the mitochondria in which they are formed.
d. are distributed by the bloodstream to all cells in the body.
At the end of the electron transport chain,
a. the electrons combine with oxygen and protons to form water.
b. the electrons are used in the formation of ethyl alcohol.
c. the electrons build up inside the mitochondria and diffuse back to a thylakoid.
d. None of the above
ATP releases energy when