Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password

Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Cell Phys Chap 16 Test

Enter the letter for the matching Answer
incorrect
1.
actin filaments and microtubules assemble (__________) and disassembly by the addition and removal of subunits (_______) at the end of the polymer
incorrect
2.
________ of the bound nucleotide reduces the binding affinity of the subunit for neighboring subunits making it more likely to dissociate from each end of the filament
incorrect
3.
two-stranded helical polymers of actin protein subuinits
incorrect
4.
ATP or GTP that is hydrolyzed must be replenished by a _____ _____ _____ of the free subunit creating a steady state. diphosphate --> triphosphate
incorrect
5.
the motor protiens that move on microtubules are either members of the _____ _____ or the _____ _____
incorrect
6.
actin binds ___
incorrect
7.
some ________ ______ assemble filaments into larger ordered structures by cross-linking them to one another in geometrically defined ways
incorrect
8.
Lateral side arms of a microvillus are composed of ______ and ______. They connect the sides of the actin filament bundle to the overlying plasma membrane
incorrect
9.
Different subunit inretactions are broken when a subunit is lost at either end
incorrect
10.
eacg actin molecule carries a tightly bound ____ that is ydrolyzed to ___ soon after assembly into the polymer
incorrect
11.
latrunulin
incorrect
12.
other types of this cytoskeleton filament extend across the cytoplasm gining cells mechanical strength
incorrect
13.
long, hollow cylinders made of tubulin subunits; outer diameter of 25 nm
incorrect
14.
what are the main types of myosin?
incorrect
15.
________ are the largest of the known molecular motors, and they are also among the fastest. They are independently evolved and have distinct structure and mechanism of action. (can move microtubules in test tube 14 mm/sec)
incorrect
16.
function of microtubules
incorrect
17.
some accessory proteins alter filament dynamics by _____ to the ends of filaments or _____ the filaments into smaller fragments
incorrect
18.
Dyenin movement is from ________ to _________
incorrect
19.
the rate of loss is given by ____ which has units of ____
incorrect
20.
As the polymer grows, subunits are used up, and C is observed to _____ until it reaches a constant value called the _____ _____
A.
accessory proteins
B.
kinesin superfamily or the dynein family
C.
nucleotide exchange reaction
D.
false (exactly the same subunit)
E.
actin filaments (microfilaments)
F.
myosin I and the Ca2+ binding protien in calmodulin
G.
positive to negative
H.
Dyneins
I.
ATP; ADP
J.
determine the positions of membrane-enclosed organelles and direct intracellular transport
K.
binding; severing
L.
drop; critical concentration
M.
(polymerize); (monomers)
N.
ATP
O.
intermediate filaments
P.
Koff; sec-1
Q.
hydrolysis
R.
microtubules
S.
myosin I (located in microvilli) and myosin II ( motor head for muscle contraction)
T.
actin-specific drug that binds subunits and prevents their polymerization
Type the Answer that corresponds to the displayed Question.
incorrect
21.
the only structural element shared among all members of each superfamily is the motor _____ domain
incorrect
22.
Microtubules depolymerize about 100 times faster from an end containing ____ tubulin that from one containing ____ tubulin
incorrect
23.
huge multinucleated cells form by the fusion of many muscle cell precursors, called ________
incorrect
24.
At the apical (upper) surface, facing the intestinal lumen, bundled actin filaments form ______ that increase the cell surface area available for absorbing nutrients from food
incorrect
25.
the formation of ______ _______ from much smaller protein subunits allows regulated filament assembly and disassembly to reshape the cytoskeleton
incorrect
26.
for ______ nucleation tthe nucleus is larger and has a more complicated structure consisting of a ring of 13 or more molecules
incorrect
27.
in epithelial tissue, they span the cytoplasm from one cell junction to another, strengthening the entire epithelium
incorrect
28.
______ _______ undergo dynamic instability, growing and shrinking at their plus ends
incorrect
29.
in isolated doublet microtubules dynein produces ______ ______
Type the Question that corresponds to the displayed Answer.
incorrect
30.
actin-specific drug that caps filaments plus ends

edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how
Created by: jacquess17