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Flashcards in True or False Deck (31)
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1

Each enzyme has a pH optimum at which it best functions.

True

2

Enzymes function equally well at any pH.

False

*specific

3

Enzyme show specificity for one stereoisomer of a molecule over the other stereoisomer.

True

4

Enzymes do no show specificity for one stereosiomer of a molecule over the other stereoisomer.

False

5

The increase in rate of an enzyme-catalyzed reaction with increasing substrate is not saturable.

False

6

Catalysis of enzymes depends solely on the amino acid side chains of enzymes.

False

7

The increase in rate of an enzyme-catalyzed reaction with increasing substrate is saturable.

True

8

Inhibition of an enzyme by a competitive inhibitor can be overcome with excess of substrate.

True

9

Inhibition of an enzyme by a competitive inhibitor is reversible.

True

10

Inhibition of an enzyme by a competitive inhibitor can not be overcome with excess of substrate.

False

11

Inhibition of an enzyme by a competitive inhibitor is irreversible.

False

12

Protein kinase A is stimulated by removal of an inhibitory subunit.

True

13

Protein kinase A is inhibited by removal of an inhibitory subunit.

False

14

Anytime something gets oxidized, something else has to get reduced.

True

15

TCA is the central core of metabolism.

True

16

Enzyme catalyzed reactions get faster in direct proportion to the concentration of substrate.

False

*Should be [E].

17

Dehydrogenases are enzymes that catalyze the transfer of electrons from one molecule to another.

True

18

Anaerobic metabolism can be damaging to a cell.

True

19

Increasing the reaction temperature of a chemical reaction makes activation energy for that reaction more readily available.

True

20

Pyruvate dehydrogenenase is a multi-enzyme complex.

True

21

The TCA cycle is physiologically reversible.

False

22

Oxidative phosphorylation is a membrane transport process.

True

23

Only monosaccarides are absorbed in digestion

True

24

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.

25

The enzyme that synthesizes RNA from a DNA template is RNA polymerase.

True

26

Synthesis is always in the 3' to 5' direction.

False.

Synthesis is always in the 5' to 3' direction.

27

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.

28

RNA synthesis in transcription is regulated by specific DNA sequences termed promoters.

True

29

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.

30

In transcription, elongation occurs in fits and starts in both initiation and elongation.

False.

Unlike initiation, elongation is a highly processive process in transcription.