Exam 3

Can be described as

(18:3) delta c9, 12, 15

Polysaccharides allow

A, B and C (strength, due to a large number of inter- and intra- molecular H-bonds, storage of large numbers of glucose molecules without osmotic stress, extension of protein structures to function above the cell glycocalyx)

Membranes are described as

A, B, and C

Transporters with transport rates that are saturable involve which of the following?

A, B, and C (not passie)

Vesicle trafficking requires

All of the above

N-linked oligosaccharides are covalently bound to __, while O-linked oligosaccharides are bound to __.

Asn sidechains; Thr, or Ser sidechains

All of the following contribute to membrane curvature, EXCEPT

Beta-barrel structure

All of the following describe integral membrane proteins, EXCEPT

Beta-barrel structures are well predicted by hydropathy plots

Which of the following statements about stereoisomers is TRUE?

Formation of a hemiacetal, or a hemiketal, creates a new chiral center

All of the following describe some motions in the membrane, EXCEPT

Lipids and proteins in the Ld state are associated in microdomains called lipid rafts.

Which of the following describe lateral asymmetry in the membrane?

Lipids are not uniformly distributed in the plane of the membrane

All of the following are TRUE about transport, EXCEPT:

No exceptions. All of the above are true

All of the following are TRUE about membrane proteins, EXCEPT

No exceptions. All of the above are true.

Secondary active transport

No exceptions; all of the above are true

Which of the following statements about lipid-anchored proteins is TRUE?

Oleate is linked trhough a thioester linkage with a Cys residue

Passive diffusion is distinguished from facilitated diffusion by:

The linear behavior of passive diffusions vs. the hyperbolic behavior of facilitated diffusion

Which of the following describe glycophorin?

Trans-membrane domain predicted by hydropathy plot

Which of the following describes the DIFFERENCE between viral and SNARE membrane fusion proteins?

Viral fusion proteins are single-use, whereas SNAREs are recycled

Which of the following amino acids is most likely to be found at the lipid-water interface?

Y

All of the following are TRUE regarding platelet activating factor, EXCEPT

a component of rattlesnake venom

Lysophospholipids

all of the above

The functions of carbohydrates include which of the following?

all of the above

Glycosaminoglycans

all of the above (are polysaccharides composed of repeating disaccharide units, have one or more monsaccharide carrying a negatively charged group, are called glycosaminoglycans, because one of the monosaccharides must have an amino group)

Sphingomyelin contains a fatty acid linked by an __ bond and phosphocholine linked to the __ ydroxyl group of sphingosine.

amide; C-1

Which of the following fatty acids ha the lowest Tm?

arachidonic acid

Lipids in membranes are described by all of the following, EXCEPT

can undergo spontaneous transverse diffusion

What makes triacylglycerols (TAGs) superior to glycogen, for energy storage?

carbons in acyl chains are more fully reduced than carbons in glycogen

Unsaturated fatty acids can

cause disruption in assemblies of lipids

Fatty acids in lipids can have

cis double bond(s)

All of the following describe cartilage matrix proteoglycan, EXCEPT

contains N-linked glycosaminoglycans

All of the following are cholesterol-based sex hormones, EXCEPT

cortisol

Passive diffusion

depends only on the concentration of the solute on either side of the membrane

All of the following describe starch, EXCEPT

glycosidic linkages in amylose are alpha(1->4), with alpha(1->6) branches

The potassium channel

has a central pore for facilitated diffusion

Cardiac glycosides are described by all of the following, EXCEPT

inhibit the potassium channel

All of the following describe chitin, EXCEPT

linear polysaccharide with monosaccharides linked by alpha(1->4)

Which of the following disacccharides is linked by an alpha(1->4) glycosidic bond?

maltose

The physical properties of lipids allow assembly of which of the following structures?

membranes with bilayer structures

All of the describe the carbohydrates of bacterial cell walls, EXCEPT

part of lipopolysaccharide "hairs," in gram-positive cells

All of the following describe the sodium/potassium pump, EXCEPT

pumps 2 molecules of sodium out and 3 molecules of potassium in

Facilitated diffusion

rate plots indicate saturation behavior

Active transport

requires an input of energy

The storage polysaccharide in plants is __, and in animals is __.

starch; glycogen

All of the following disaccharides are reducing sugars, EXCEPT:

sucrose

All of the following describe gangliocides, EXCEPT

they are cerebrosides

All of the following are TRUE regarding terpenes, EXCEPT

they contain carboxylate groups at C-1

All of the followign describe transport across membranes, EXCEPT

transporters can be peripheral, integral, or membrane anchored proteins

All of the following are membrane lipids, EXCEPT

triacylglycerol

All of the following are TRUE regarding glycerophospholipids, EXCEPT

unsaturated fatty acids are commonly found at C-1 of the glycerol backbone

Which of the following monosaccharides is a ketose?

xylulose