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MASTERING BIO ACTUAL QUESTIONS AND CORRECTLY WELL DEFINED ANSWERS LATEST ALREADY GRADED A+
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MASTERING BIO ACTUAL QUESTIONS AND CORRECTLY WELL DEFINED ANSWERS LATEST ALREADY GRADED A+
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MASTERING BIO ACTUAL QUESTIONS ANDCORRECTLY WELL DEFINED ANSWERS
LATEST ALREADY GRADED A+
Which best explains why more ATP is made per molecule of NADH than per
molecule of FADH2? - ANSWERS-Fewer protons are pumped across the inner
mitochondrial membrane when FADH2 is the electron donor than when NADH is
the electron donor. Electrons derived from the oxidation of FADH2 enter the
electron transport chain at Complex II, farther down the chain than electrons
from NADH (which enter at Complex I). This results in fewer H+ ions being
pumped across the membrane for FADH2 compared to NADH, as this diagram
shows. Thus, more ATP can be produced per NADH than FADH2.
Under anaerobic conditions (a lack of oxygen), the conversion of pyruvate to
acetyl CoA stops. What is the correct explanation for this observation? -
ANSWERS-In the absence of oxygen, electron transport stops. NADH is no longer
converted to NAD+ which is required for the first three steps of cellular
respiration. NAD+ couples oxidative phosphorylation to acetyl CoA formation. The
NAD+ needed to oxidize pyruvate to acetyl CoA is produced during electron
,transport. Without O2, electron transport stops, and the oxidation of pyruvate to
acetyl CoA also stops because of the lack of NAD+.
Suppose that a cell's demand for ATP suddenly exceeds its supply of ATP from
cellular respiration.
What describes how this increased demand would lead to an increased rate of
ATP production? - ANSWERS-ATP levels would fall at first, decreasing the
inhibition of PFK, and increasing the rate of ATP production
During strenuous exercise, anaerobic conditions can result if the cardiovascular
system cannot supply oxygen fast enough to meet the demands of muscle cells.
Assume that a muscle cell's demand for ATP under anaerobic conditions remains
the same as it was under aerobic conditions.
What would happen to the cell's rate of glucose utilization? - ANSWERS-Glucose
utilization would increase a lot. ATP made during fermentation comes from
glycolysis, which produces a net of only 2 ATP per glucose molecule. In contrast,
aerobic cellular respiration produces about 30 ATP per glucose molecule. To meet
the same ATP demand under anaerobic conditions as under aerobic conditions, a
cell's rate of glycolysis and glucose utilization must increase about 15-fold.
How will a healthy individual's ATP production change during an eight-hour fast? -
ANSWERS-The individuals ATP production will not change drastically.
Cellular respiration and breathing differ in that cellular respiration is at the
cellular level, whereas breathing is at the organismal level. T or F? - ANSWERS-
True
,"Conservation of energy" refers to the fact that _____. - ANSWERS-Energy cannot
be created nor destroyed but can be converted from one form to another
Chemical energy is a form of _____ energy. - ANSWERS-Potential, Chemical
energy is a form of stored energy.
What is the proper function of Cellulose? - ANSWERS-Structural component of
plant cell walls
Which polysaccharide contains a modified monosaccharide? - ANSWERS-
Peptidoglycan
Which polymers are composed of amino acids? - ANSWERS-Proteins
True or false? An oxygen is attached to the central carbon atom in an amino acid -
ANSWERS-False, it is not attached to the central carbon atom in an amino acid.
Which part of an amino acid is always acidic? - ANSWERS-The carboxyl functional
group.
Which monomers make up RNA? - ANSWERS-Nucleotides
, In the formation of polypeptides from amino acids A bond forms between the
carboxyl functional group of one amino acid and the amino functional group of
the other amino acid. T or F? - ANSWERS-True
True or false? Peptidoglycan is a polysaccharide found only in bacteria. -
ANSWERS-True
True or False? Monosaccharides can be classified according to the spatial
arrangement of their atoms. - ANSWERS-True
Which complex carbohydrate contains only a-1,4-glycosidic linkages? - ANSWERS-
Amylose
True or false? Enzymes in the digestive tract catalyze hydrolysis reactions. -
ANSWERS-True
The label on a container of margarine lists "hydrogenated vegetable oil" as the
major ingredient. What is the result of adding hydrogens to vegetable oil? -
ANSWERS-The hydrogenated vegetable oil stays solid at room temperature.
How many fatty acids are in a phospholipid? - ANSWERS-2
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