Micro Quiz 2

Sulfanillimide is an antimicrobial drug that mimics the shape of an important substrate for a particular bacterial enzyme, therby inhibiting the enzyme. This type of inhibition is known as:
A. excitatory allosteric control
B. competitive inhibition
C. allosteric inhibition
D. both a and c
E. a, b, and c

Which of the following is a true statement concerning the structure and function of ALL enzymes?
A. the higher the temerature, the faster an enzyme will work
B. an apoenzyme is a combination of a cofactor bound to a holoenzyme
C. competitive inhibition of an enzyme occurs when an inhibitor binds to an allosteric site on the eznyme
D. they must bind to cofactors in order to function
E. after an enzyme has catalyzed a reaction, it resumes its original shape and can interact with a new substrate molecule

All of the following are true statements concerning glycolysis EXCEPT:
A. it produces ATP by oxidative phosphorylation
B. it involves the conversion of a molecule of glucose into two molecules of pyruvic acid
C. it is a pathway common to both respiration and fermentation
D. it uses, as well as produces, ATP.
E. it occurs in the cytoplasm of the cell

The molecule which an enzyme acts upon is known as its
A. coenzyme
B. apoenzyme
C. substrate
D. holoenzyme
E. catalyst

In which of the following stages of glycolysis is ATP made?
A. energy-investment stage
B. energy-conserving stage
C. lysis stage
D. both b and c
E. both a and b

True/False: a metabolic reaction that creates large molecules from smaller reactant molecules is catabolic.
True False

True/False: a molecule that receives an electron from another molecule has been reduced.
True False

True/False: The donation of a pentose sugar to a molecule is known as phosphorylation.
True False

True/False: the area of a holoenzyme where the reaction takes place is the allosteric site.
True False

When a phosphate group is tansferred to a molecule from a phophorylated organic compound such as ATP, the transfer process is called
A. photophosphorylation
B. substrate-level phosphorylation
C. catabolic phosphorylation
D. reductative phosphorylation
E. oxidative phosphorylation

Enzymes that catalyze the transfer of electrons and/or hydrogen ions from one molecule to another are known as
A. lyases
B. ligases (polymerases)
C. hydrolases
D. oxireductases
E. isomerases

The protein portions of enzymes which need to bind with one or more cofactor before they can catalyze reaction are called
A. coenzymes
B. apoenzymes
C. ribozymes
D. holoenzymes
E. DNAses

Cofactors and coenzymes are obtained primarily through/from
A. an organism's diet
B. redox reactions
C. the Entner-Douderoff pathway
D. the Krebs cycle
E. glycolysis

All of the following are true statements concerning cellular metabolism EXCEPT
A. ATP is used in the formation of macromolecules
B. enzymes are used in both catabolic and anbolic reactions
C. energy obtained from nutrients or light is stored in the bonds of ATP
D. macromolecules are converted into cell structures via catabolism
E. the goal of metabolism is reproduction of the organism

True/False: The amount of energy released by a chemical reaction which has been catalyzed by an enzyme is known as its activation energy.
True False

True/False: Enzymes function best within narrow ranges of temperature and pH.
True False

True/False:When an inhibitor molecule binds to an enzyme's allosteric site, the shape of the active site changes so that substrate molecules can no longer bind.
True False

In the aerobic catabolism of glucose, which process directly produces the greatest amount of ATP?
A. electron transport chain
B. formation of Acetyl-CoA
C. glycolysis
D. lactic acid fermentation
E. Krebs cycle

They glycolysis pathway is basically
A. amphibolic
B. aerobic
C. catabolic
D. anabolic
E. cyclical

Acetyl-Coenzyme A is formed directly from what molecule?
A. carbon dioxide
B. glucose
C. none of these
D. pyruvic acid
E. citric acid

Under ideal contitions, the complete aerobic oxidation of one molecule of glucose allows a net gain of how many ATP molecules?
A. 4
B. 0
C. 2
D. 24
E. 38

Which of these forms of phosphorylation is/are MOST applicable to the bacteria we'll sudy in this course?
A. oxidative phosphorylation
B. a and c
C. substrate-level phosphorylation
D. photophosphorylation
E. a and b

When a compound is oxidized, it
A. gives away one or more protons
B. gives away one or more electrons
C. accepts (takes in) one or more protons
D. accepts (takes in) one or more neutrons
E. accepts (takes in) one or more electrons

Lab personnel use all of the following substances to determine which sugars a bacterium can catabolize EXCEPT
A. acids
B. nucleic acids
C. pH indicators
D. carbon dioxide

All of the following are true statements concerning all enzymes EXCEPT
A. they are usually, but not always, proteins
B. they form a temporary intermediate compound with a substrate
C. they can be denatured if the pH of their environment is too high or too low
D. they can be used to catalyze a chemical reaction over and over again
E. they function best at 37⁰ C

What type of inhibition occurs when a substance produced by a metabolic pathway attaches to an enzyme's allosteric site?
A. feedback inhibition
B. isolative inhibition
C. none of these
D. competitive inhibition
E. catabolic inhibition

All of the following are true statements regarding fermentation EXCEPT
A. the main goal is ATP production
B. the final electron acceptor is an organic molecule
C. ethanol and lactic acid are possible products
D. NADH is oxidized
E. it starts with glycolysis