extra physiology Q's (endterm) Flashcards Preview

FB1 - 2nd year > extra physiology Q's (endterm) > Flashcards

Flashcards in extra physiology Q's (endterm) Deck (160)
Loading flashcards...
1

What's the main component of tight junctions?
a. claudin
b. occludin

a. claudin

2

How does glucose enter the intestinal cells?
a. primary transport
b. secondary transport
c. tertiary transport
d. facilitated diffusion

b. secondary transport

(Na driven glucose symports)

3

How does glucose leave intestinal cells and go into the blood?
a. primary transport
b. secondary transport
c. tertiary transport
d. facilitated diffusion

d. facilitated diffusion

4

Which is found in the basolateral surface?
a. heregulin
b. heregulin receptors

b. heregulin receptors

(a= apical surface)

5

What do desmosomes use to anchor cells?
a. actin filaments
b. cytoskeletal filaments

b. cytoskeletal filaments

(hemidesmosomes use actin filaments AKA microfilaments)

6

Which connects cells to ECM?
a. anchoring proteins
b. Integrin proteins

b. Integrin proteins

7

What helps convert integrins from an inactive bent form to an extended primed state?
a. IPP
b. Src
c. Talin

c. talin

8

Which is a monomer?
a. F-actin
b. G-actin

b. G-actin

9

Which is added to bound protein to produce microfilaments?
a. F-actin
b. G-actin

a. F-actin

10

Which is located on cell edges?
a. actin
b. tubulin
c. nucleus
d. myosin I

a. actin

11

Which is responsible for cell shape and locomotion?
a. actin
b. tubulin
c. nucleus

a. actin

12

Which is responsible for mitosis?
a. actin
b. tubulin
c. nucleus

b. tubulin

(tubulin forms microtubules which are responsible for mitosis)

13

Which of the following is responsible for major cell movement?
a. membrane shuttle movement
b. Integrin shuttle movement

b. Integrin shuttle movement

14

What stops actin polymerization?
a. cytochalasins
b. phalloidin

a. cytochalasins

(phalloidin inhibits depolymerization)

15

Which is NOT a function of myosin I?
a. regulate tension
b. maintain cell shape
c. aid in cell movement
d. bind actin filaments and cellular membranes
e. aid in endo- and exocytosis

c. aid in cell movement

16

Where do lipids bind myosin I?
a. TH1 domain
b. Motor domain
c. Neck region

a. TH1 domain

17

Where does ATP bind myosin I?
a. TH1 domain
b. Motor domain
c. Neck region
d. THA domain

b. Motor domain

18

Which cannot work alone?
a. myosin I
b. myosin II
c. myosin V

c. myosin V

(it's a dimeric motor protein)

19

When does myosin V dissociate from actin?
a. when ATP binds
b. when ADP is released
c. when the phosphate is released

a. when ATP binds

20

Which initiates the waiting stage of myosin V?
a. when ATP binds
b. when ADP is released
c. when the phosphate is released

c. when the phosphate is released

21

What protein makes a thick filament?
a. actin
b. myosin

b. myosin

(actin = thin filament)

22

Where are the microtubules located?
a. in the nucleus
b. edges of cell
c. in the middle of the cell

c. in the middle of the cell

23

Which side of microtubules does polymerization take place (which side is the positive side)?
a. α-tubulin
b. β-tubulin

b. β-tubulin

24

Which of the following microtubules will rapidly dissociate?
a. one with mostly GTP bound tubulin
b. one with mostly GDP bound tubulin
c. one with completely GDP bound tubulin

c. one with completely GDP bound tubulin

(it always needs to be active)

25

In mitosis, which microtubule end is facing the microtubule organizing center?
a. α-tubulin
b. β-tubulin

a. α-tubulin

(the negative side)

26

In mitosis, which microtubule end is facing the cell edge?
a. α-tubulin
b. β-tubulin

b. β-tubulin

(the positive side)

27

Which is responsible for retrograde transport?
a. Kinesin
b. Dynein

b. Dynein

28

Kinesin & Dynein proteins travel on
a. Microfilaments
b. Microtubules

b. Microtubules

29

myosin proteins travel on
a. Microfilaments
b. Microtubules

a. Microfilaments

(actin microfilaments)

30

Keratin is classifies as a
a. Microfilament
b. Intermediate Filament
c. Microtubule

b. Intermediate Filaments