Multiple Choice from Exams 1-4 Flashcards Preview

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Flashcards in Multiple Choice from Exams 1-4 Deck (21):
1

How does the dielectric constant after the electrostatic energy

inversely

2

Which of the following is true of a buffer with a pKa of 8.0

at pH 6, the buffer would be completely protonated

3

Relies on the chance charge separation of one atom to induce a dipole in a second atom

Van der Waals interactions

4

Which amino acids have a side chain that is negatively charged at physiological pH

aspartate and glutamate

5

Essential amino acids

Histidine
Isoleucine
Leucine
Lysine
Methionine
Phenylalanine
Threonine
Tryptophan
Valine

6

Which of the following is true of the peptide bond in naturally-occurring proteins

It has partial double bond characteristics

7

Which of the following is true of protein structure

all proteins have tertiary structure

8

What is true of a Ramachandran plot?

a. Secondary structure types have characteristics locations on a Ramachandran plot
b. Some locations on a Ramachandran diagram are not permitted for amino acids because of steric hindrance
c. It shows the combinations of torsion angle within a protein structure

9

What is true of protein folding?

a. it is a random series of events that spontaneously results in the correct fold
b. the folded state of the protein is the lowest energy state
c. correct intermediate forms are progressively stabilized until the completely correct fold is reached

10

A mutation in which protein results in the disorder epidermolysis bulls simplex (EBS)

keratin

11

Which of the following trends is/are observed during protein purification

the specific activity increases with each purification step

12

Nitrogenase transfers electrons from ferredoxin to N2 to make ammonia. What class of enzyme is this?

oxidoreductase

13

Hexokinase has a Km of 0.9 mM for its substrate glucose. Glucokinase has a Km of 90 mM for glucose. Which enzyme has the highest affinity for glucose?

Hexokinase

14

shift the T/R equilibrium for both allosteric models

allosteric effectors

15

The influence of the substrate on allosteric enzymes to alter their T/R equilibrium

Cooperativity

16

What is the molecular basis of gout?

Urate accumulates in the fluid and lining of joints causing inflammation. PRS catalysis at the active site is unchanged. PRS enzyme loses its feedback-inhibition response to purines

17

Glyphosphate binds to the enzyme EPSP at the active site instead of the substrate molecule PEP and prevents catalysis. What type of inhibitor is it?

competitive

18

Which of the following is true of the allosteric effectors of hemoglobin

a high concentration of H+ facilitates O2 release

19

Which of the following best describes the molecular basis of ion channel selectivity?

Ion channels only allow one specific ion through their selectivity filter.

20

Which of the following is true of biological membranes

membranes are highly impermeable to charged molecules

21

Oxidize carbon fuels to generate ATP

catabolic pathways