mcat biochem chapter 3

Question 1

what makes up most of the ecm of connective tissue

and what is its purpose(2)

Answer 1

collagen

strength and flexibility

Question 2

what is another component of the ecm of connective tissue

and what is its purpose(2)

Answer 2

elastin

stretch and recoil

Question 3

component of microfilaments and the thin filaments in myofibrils
what kind of polarity do they have and how does it allow motor proteins to travrl?

Answer 3

actin

they have a positive and a negative side which allows motor prots to travel unidirectionally along an actin filament

Question 4

what is the protein that makes up microtubules
name three functions of the protein
what kind of polarity does it have

Answer 4

tubulin
provides structure, chromosome separation in mitosis and meiosis, and intracellular transport with kinesin and dynein
the negative end of a microtubule is next to the nucleus, the positive end is outside the cell

Question 5

what are the motor prots associated with microtubules

and describe their structure

Answer 5

kinesin and dynein

they have two heads with one attached to tubulin at all times

Question 6

what do 2 things kinesins do

Answer 6

kinesins help when chsomes align during metaphase and depolymerizing microtubules during anaphase of mitosis