Test 3 - Quiz #9

Question 1

Each monomer of actin binds one molecule of the nucleotide triphosphate
     A. ATP
     B. GTP
     C. CTP
     D. UTP

Answer 1

A. ATP

Question 2

Actin filaments are bound into bundles of parallel filaments by the proteins
     A. Filamin and spectrin
     B. Troponin and tropomyosin
     C. Profiling and thymosin
     D. Alpha - actinin and fimbrin

Answer 2

D. Alpha - actinin and fimbrin

Question 3

Myosin \_\_\_\_\_\_ is present in muscle sarcomeres
     A. I
     B. II
     C. III
     D. IV

Answer 3

B. II

Question 4

Which nucleotide triphosphate is hydrolyzed during a cycle of microtubule assembly and disassembly?
     A. ATP
     B. TTP
     C. CTP
     D. GTP

Answer 4

D. GTP

Question 5

Both colichine and colcemid
A. Block microtubule organizing centers
B. Block microtubule disassembly by binding to microtubule ends
C. Block microtubule assembly by binding to free tubulin
D. Accelerate microtubule disassembly by binding to tubulin in microtubules, causing those molecules to exit the microtubule more quickly

Answer 5

C. Block microtubule assembly by binding to free tubulin

Question 6

Keratin filaments are anchored to junctions called:
     A. Adherens junctions
     B. Tight junctions
     C. Desmosomes
     D. Gap junctions

Answer 6

C. Desmosomes