P3 Chapter 25 METABOLISM & NUTRITION Flashcards
(124 cards)
Which of these four series of reactions uses oxygen in the last reaction of the series?
a. glycolysis
b. formation of Acetyl coenzyme A
c. Krebs cycle
d. electron transport chain
d. electron transport chain
Obesity is defined as a body weight more than _____ above a desirable standard due to excessive accumulation of adipose tissue
a. 10 percent
b. 20 percent
c. 30 percent
d. 40 percent
b. 20 percent
The only B vitamin not found in vegetables, the only vitamin containing cobalt, and the only vitamin requiring intrinsic factor for proper absorption is vitamin
a. B1 (thiamine)
b. B2 (riboflavin)
c. B6 (pyridoxine)
d. B12 (cyanocobalamin)
d. B12 (cyanocobalamin)
Which vitamin is essential for the formation of photopigments and, if deficient, leads to nightblindness?
a. A
b. D
c. E
d. K
a. A
Which of the following minerals serves as an antioxidant, prevents chromosome damage, and may play a role in preventing certain birth defects?
a. zinc
b. magnesium
c. chromium
d. selenium,
d. selenium,
The base of the food guide pyramid includes
a. fruits
b. raw leafy vegetables
c. milk and yogurt
d. bread and cereals
d. bread and cereals
Experts in good nutrition recommend that we get about _____ of our calories from complex carbohydrates
a. 50 - 60 percent
b. 30 percent
c. 15 percent
d. 10 percent
a. 50 - 60 percent
During the postabsorptive state, when we exercise, the anaerobically produced lactic acid is
a. oxidized in the skeletal muscles when oxygen becomes available
b. carried to the liver where it is converted into glucose and put back into the blood
c. carried to the kidney where it is excreted
d. converted to ketone bodies, which are used by all cells of the body
b. carried to the liver where it is converted into glucose and put back into the blood
During the absorptive state, amino acids are
a. deaminated and used as an energy source
b. stored by the liver for later use
c. used by most cells for protein synthesis
d. used for gluconeogensis
c. used by most cells for protein synthesis
The main hormone that is active during the absorptive state is
a. insulin
b. glucagon
c. thyroid hormone
d. cortisol
a. insulin
Which molecule will undergo different reactions, depending on whether oxygen is plentiful, or in short supply?
a. acetyl CoA
b. citric acid
c. glucose 6-phosphate
d. pyruvic acid
d. pyruvic acid
After glucose 6-phosphate is formed in a cell it cannot
a. be used to synthesize glycogen
b. diffuse out of the cell
c. be used for the synthesis of the sugar needed in RNA
d. be used in glycolysis
b. diffuse out of the cell
Before amino acids can enter the Krebs cycle, they must undergo
a. lipolysis
b. beta oxidation
c. deamination
d. glycolysis
c. deamination
An increase in urea in the blood would indicate an increase in the breakdown of
a. glucose
b. amino acids
c. fatty acids
d. glycerol
b. amino acids
Acetone, acetoacetic acid, and beta-hydroxybutyric acid are
a. ketone bodies
b. chylomicrons
c. micelles
d. emboli
a. ketone bodies
The majority of fat in the body is stored in fat cells located
a. subcutaneously
b. around the heart
c. in the abdomen
d. around the kidneys
a. subcutaneously
How many oxygen molecules are used during the complete oxidation of one glucose molecule?
a. 2
b. 4
c. 6
d. 8
c. 6
In which cellular compartment does glycolysis occur?
a. nucleus
b. cytoplasm
c. mitochondrion,
d. endoplasmic reticulum
b. cytoplasm
NADH dehydrogenase complex, cytochrome b-c1 complex, and cytochrome oxidase complex are all
a. proton pumps in the mitochondrial membrane
b. enzymes of the Krebs cycle
c. kinases in the glycolysis reactions
d. molecules that transport pyruvic acid into the mitochondrion .
a. proton pumps in the mitochondrial membrane
For every glucose molecule metabolized, how many carbon dioxide molecules are produced?
a. 2
b. 4
c. 6
d. 8
c. 6
Which of the following reactions does NOT occur in the Krebs cycle?
a. production of reduced coenzymes
b. production of carbon dioxide
c. generation of GTP, which is used to produce ATP
d. formation of lactic acid in the absence of oxygen
d. formation of lactic acid in the absence of oxygen
In glycolysis, which of the following ATP energy budgets is correct?
a. 2 ATPs produced - 0 ATPs used = net gain of 2 ATPs
b. 4 ATPs produced - 0 ATPs used = net gain of 4 ATPs
c. 4 ATPs produced - 2 ATPs used = net gain of 2 ATPs
d. 2 ATPs produced - 1 ATPs used = net gain of 1 ATP
c. 4 ATPs produced - 2 ATPs used = net gain of 2 ATPs
As a result of glycolysis, there is a net gain of ____ ATP molecules
a. two
b. four
c. twenty
d. thirty two
a. two
Which of these four processes produces the most ATP?
a. glycolysis
b. formation of Acetyl coenzyme A
c. Krebs cycle
d. electron transport chain
d. electron transport chain