Exam 2 (better)

Question 1

Glycerophospholipids have ___ acyl chains

Answer 1

2

Question 2

Monosaccharide turn into its ___, not requiring catalyst

Answer 2

anomer

Question 3

Lipid not found in animals

Answer 3

triaglycerols

Question 4

Porins

Answer 4

trimeric and made of beta barrels

Question 5

NA/K-ATPase is
Na moves (inside/out) of the cell
K moves (inside/out) of the cell

Answer 5

antiporter
out
inside

Question 6

G protein activated when ___ binds to __ subunit

Answer 6

GTP, alpha

Question 7

Cytosolic Ca2+ is greater in the

Answer 7

extracellular fluid

Question 8

Nicotine is an ___ to acetylcholine

Answer 8

agonist

Question 9

Receptor no longer transmits signal when it is continuously exposed to ligand, so it is

Answer 9

desensitized

Question 10

A –> B + C , rate constant = ?

Answer 10

First order

Question 11

D-Psicose and D-Sorbose are

Answer 11

epimers

Question 12

Zero order process

Answer 12

top of curve, where it reaches Vmax

Question 13

A glycerophospholipid is

Answer 13

amphipathic

Question 14

N-linked is dif from O-linked glycosylation in that

Answer 14

the network for N-linked glycoproteins is less extensive than O-linked

Question 15

Enzyme velocity and enzyme concentration have a ___ relationship

Answer 15

linear

Question 16

Action potential is rapidly propagated because

Answer 16

axons are insulated with a myelin sheath, preventing ion movement except at the nodes

Question 17

Inhibitors that lower Vmax but don’t affect Km also

Answer 17

affect kcat
affect catalytic function
are noncompetitive
do not affect substrate binding

Question 18

Km = 2 uM
[enzyme] = 200 nM
[substrate] = 0.1 uM - 10 uM
What is wrong

Answer 18

Enzyme concentration too high, decrease it

Question 19

Amylopectin has ____ and branches at ____.

Answer 19

a(1:4) ; a(1:6)

Question 20

Ligand + tyrosine kinase =

this ___ the next protein in the pathway

Answer 20

phosphorylation ; phosphorylates

Question 21

__ is not a reducing sugar

Answer 21

Sucrose

Question 22

(T/F) A lipid bilayer is stabilized by covalent interaction.

Answer 22

False

Question 23

Edema Factor is a toxin that

Answer 23

increases cAMP levels and activates Protein Kinase A

Question 24

resting mem pot = -70 mV

ration [Na]/[K] = ??

Answer 24

0.062

Question 25

cAMP in glycogen breakdown

Answer 25

activates protein kinase A -> phophrylates phosphorylase kinase -> activates glycogen phosphorylase -> break down glycogen

Question 26

[Na+]out = 150, [Na+]in = 15, T = 37 C

Free energy when resitn pot = -60 mV

Answer 26

-11.7 kJ/mol

Question 27

Low pH ____ Asp and Glu residues and ___ acid-gated channels

Answer 27

neutralizes ; open

Question 28

50 days, hippurylphenylalanine

Answer 28

2.7 M/s

Question 29

secondary messenger that is soluble in the cytoplasm

Answer 29

inositol triphosphate

Question 30

acyl chains in sphingosine backbone for sphingomyelin molecule

Answer 30

1

Question 31

product releases before next substrate binds

Answer 31

ping-pong mechanism

Question 32

NOT a passive mediated transorter

Answer 32

Na/K transporter

Question 33

mutant Ras effect

Answer 33

does not hydrolyze GTP

Question 34

NOT an enzyme in insulin response pathway

Answer 34

adapter protein

Question 35

Adding phorbol esters affect culture pathways by

Answer 35

activating protein kinase C

Question 36

Solely structural molecule

Answer 36

chitn