True or False Flashcards
Each enzyme has a pH optimum at which it best functions.
True
Enzymes function equally well at any pH.
False
*specific
Enzyme show specificity for one stereoisomer of a molecule over the other stereoisomer.
True
Enzymes do no show specificity for one stereosiomer of a molecule over the other stereoisomer.
False
The increase in rate of an enzyme-catalyzed reaction with increasing substrate is not saturable.
False
Catalysis of enzymes depends solely on the amino acid side chains of enzymes.
False
The increase in rate of an enzyme-catalyzed reaction with increasing substrate is saturable.
True
Inhibition of an enzyme by a competitive inhibitor can be overcome with excess of substrate.
True
Inhibition of an enzyme by a competitive inhibitor is reversible.
True
Inhibition of an enzyme by a competitive inhibitor can not be overcome with excess of substrate.
False
Inhibition of an enzyme by a competitive inhibitor is irreversible.
False
Protein kinase A is stimulated by removal of an inhibitory subunit.
True
Protein kinase A is inhibited by removal of an inhibitory subunit.
False
Anytime something gets oxidized, something else has to get reduced.
True
TCA is the central core of metabolism.
True
Enzyme catalyzed reactions get faster in direct proportion to the concentration of substrate.
False
*Should be [E].
Dehydrogenases are enzymes that catalyze the transfer of electrons from one molecule to another.
True
Anaerobic metabolism can be damaging to a cell.
True
Increasing the reaction temperature of a chemical reaction makes activation energy for that reaction more readily available.
True
Pyruvate dehydrogenenase is a multi-enzyme complex.
True
The TCA cycle is physiologically reversible.
False
Oxidative phosphorylation is a membrane transport process.
True
Only monosaccarides are absorbed in digestion
True
The enzyme that synthesizes RNA from a DNA template is DNA polymerase.
False.
The enzyme that synthesizes RNA from a DNA template is RNA polymerase.
The enzyme that synthesizes RNA from a DNA template is RNA polymerase.
True
Synthesis is always in the 3’ to 5’ direction.
False.
Synthesis is always in the 5’ to 3’ direction.
RNA synthesis in transcription is regulated by specific RNA sequences termed promoters.
False.
RNA synthesis in transcription is regulated by specific DNA sequences termed promoters.
RNA synthesis in transcription is regulated by specific DNA sequences termed promoters.
True
RNA synthesis in transcription is regulated by specific RNA sequences termed initiators.
False.
RNA synthesis in transcription is regulated by specific DNA sequences termed promoters.
In transcription, elongation occurs in fits and starts in both initiation and elongation.
False.
Unlike initiation, elongation is a highly processive process in transcription.
In eukaryotes transcription takes place in the nucleus and translation takes place in the cytoplasm; the two processes are uncoupled.
True
