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cell bio > ch 11 > Flashcards

ch 11 Flashcards

cytoskeleton

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Biology 101 flashcards
1
Q

cytoskeleton

A

protein based fibers that give the cell structure and shape

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1
Q

actin (microfilaments)

A

composed of actin
narrowest

cell movement
muscle contraction
aid in cell division

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2
Q

actin dimer

A

two proteins linked together

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3
Q

actin trimer

A

three proteins linked togetherp

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4
Q

polymerization

A

individual actin monomers linked together to form a polymer

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5
Q

plus end

A

end that gets added to

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6
Q

minus end

A

end that monomers leave

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7
Q

formin

A

protein that initiates an ACTIN polymer

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8
Q

Arp

A

actin-related protein

starts branch on side of actin filaments

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9
Q

actin bundles

A

parallel filaments

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10
Q

actin networks

A

NONparallel links

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11
Q

crosslinking proteins

A

mediates connections of actin networks and bundles

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12
Q

pseudopoda

A

“false foot”

extension that helps cells move

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13
Q

myosin

A

motor protein
muscles

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14
Q

muscle contractions

A

actin filaments are pulled by myosin

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15
Q

contractile ring

A

ring made of actin that forms when cells divide/split

16
Q

microtubules

A

largest cytoskeletal component

large hollow tubes
cell movement

17
Q

microtubules structure

A

alpha and beta tubulin

form dimer then join tube

18
Q

centrosomes

A

cellular region where microtubules start

center of cell

19
Q

microtubule-associated proteins (MAPs)

A

control microtubules
promote polymerization/growth

20
Q

depolymerase

A

MAPs that promote shrinkage/depolymerization

can cause tubulins to leave PLUS end

21
Q

where are vesicles transported along

A

microtubules

pulled along by motor proteins

22
Q

dyneins

A

motor proteins that move towards minus end

23
Q

kinesins

A

motor proteins that move towards plus end

24
Q

what pulls chromosomes apart during cell division

A

microtubules

25
Q

intermediate filament

A

several protein fibers wound together
keep organelles in place
resist tension and maintain cell shape

26
Q

protofilament

A

tetramers link to form

wrap around each other to form a filament

27
Q

where do intermediate filaments attach

A

desmosomes

cell bio (15 decks)

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