Pollev

Which of the following is not a function of membranes?

Impermeable barrier

Which of the following is not amphipathic?

saturated fatty acid tail

Which blood type is considered the "universal recipient" ?

Туре АВ

Which blood type is considered the "universal donor" of RBCs?

Type O

Peripheral membrane proteins and integral membrane proteins...

differ in that peripheral membrane proteins are bound to the membrane by via noncovalent interactions , while integral membrane proteins are bound by hydrophobic interactions

If a rabbit and a mouse cell are fused together and incubated on ice for one hour…

A heterocaryon is formed in which almost all the labeled proteins remain segregated

If the extracellular concentration of a small uncharged molecule (Molecule "X" - not water) is 3 x 10-3 M and the intracellular concentration is 3 x 10-8M, then:

extracellular molecule X will diffuse into the cell

When moving from one side of the membrane to the other, charged ions

Move down an electrochemical gradient

Mutation of the CFTR ion channel causes:

decreased flow of Cl- ions from epithelial cells into the extracellular space

The selectivity filter of the potassium channel

is highly selective for potassium ions because of its size and charges

When moving passively from one side of the membrane to the other, charged ions

pass through ion channels in the lipid bilayer

You attempt to make tubulin polymers in vitro. You add cell extracts to large amounts of a- and b-Tubulin, ATP, GTP, GDP, and set a proper temperature for their assembly. After you get polymers, which of the following will be depleted from the test tube?

GTP

You have made tubulin polymers in vitro, but they are transient, which is not great for taking pictures. Which drug might help you maintain the microtubules? Which drug might help you maintain the microtubules

taxol

After much work (EM), you realize your polymers are small in diameter. Which of these additions would help?

the gamma-Tubulin ring complex

Intermediate filaments differ most from microtubules in:

the ability of hydrolyze GTP

An abnormally high level of phosphorylation of a particular microtubule associating protein (MAP), called what has been implicated in the development of several fatal neurodegenerative disorders, like what

tau, Alzheimer's disease

Individual monomers of a microfilament move down the length of the microfilament from the plus end to the minus end in vitro in a process known as

treadmiling

Overexpression of which following actin binding protein most likely will keep Listeria infection spreading from one cell to its neighbors in cell culture?

Filament severing protein

What is the direct source of energy that powers molecular motors?

hydrolysis of ATP

In the model, the two heads of the molecular motor would take turns being in front as the dimeric motor walked along the microtubule

hand-over-hand

After cytochalasin D treatment, you predict the cells will:

stop extending protrusions and freeze

if you stretched a relaxed myofibril, which bands/zones would NOT change in size?

A band