Cell biology, please help with all just multiple choice questions as possible, if cannot please let me know.

54. Activation of Smads results in:

Select one:

a. phosphorylation of targets in the cytoplasm

b. activation of a GTPase

c. their localization to the plasma membrane

d. their translocation to the nucleus

55. Which of the following is the GAP for Sar1?

Select one:

a. Sec12

b. Sec23

c. SarGAP

d. Sec24

56. Which of the following proteins interact directly with tropomyosin?

Select one:

a. troponin C

b. troponin T

c. myosin

d. troponin I

57. You engineer a protein to be directed to the ER lumen of yeast cells (i.e. you add a signal sequence), but you still find much of this protein in the Golgi. A way to increase the amount of protein that accumulates in the ER would be to...

Select one:

a. incorporate lipid modification sites into the protein.

b. make a mutation to promote more rapid folding

c. invert the order of amino acids in the signal sequence

d. add glycosylation sites

e. incorporate an HDEL signal.

58. Which of the following proteins is activated by calmodulin?

Select one:

a. myosin light-chain kinase (MLCK)

b. phospholipase C

c. PKA

d. Akt

e. connexins

59. Newly translated protein Y accumulates in the Golgi, so it is likely that the protein

Select one:

a. is not folded properly

b. is a COPII cargo

c. is translated in the cytoplasm

d. possesses a KDEL signal

60. The 'power stroke' of which of the following motor proteins is associated with the release of ADP?

Select one:

a. Dynein

b. Myosin

c. Kinesin

d. All of the above

61. At the critical concentration for the plus end of a microtubule you would expect

Select one:

a. the plus end to grow

b. both the plus and minus ends to grow

c. the minus end to shrink

d. the length of the entire microtubule to stay the same

62. The "9 + 2" pattern of the axoneme refers to nine ________ and ________ .

Select one:

a. triplet MTs; two basal bodies

b. outer doublet MTs; a central pair of MTs

c. outer doublets MTs; two basal bodies

d. central tubules; two outer double MTs

e. outer MTs; two middle MTs

63. Which of the following is NOT a cytoplasmic intermediate filament?

Select one:

a. keratins

b. neurofilaments

c. lamins

d. vimentin

64. During skeletal muscle contraction, the troponin complex is responsible for

Select one:

a. regulating myosin interactions with thin filaments

b. stabilizing the minus ends of thin filaments

c. triggering release of calcium from the sarcoplasmic reticulum

d. catalyzing ATP binding to myosin

65. In the secretory pathway, what is the sorting signal for proteins destined for the lysosome?

Select one:

a. KDEL

b. mannose-6-phosphate

c. lipidation

d. N-linked glycosylation