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QUIZ - -QUIZ-Cytoskeleton You will have 12 questions from...

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----------QUIZ------------ Cytoskeleton: You will have 12 questions from chapter 9, about microtubules, centrioles, MF’s and IF’s: Use the Cytoskeleton-sarcomere-study sheet; it should be nearly everything you need for Sarcomeres. Here are some questions you might have: 1. ____________ moves to the plus end of a microtubule a. Kinesin b. Centriole c. Dynactin d. Dynein e. Myosin 2. The microtubule wall is composed of globular proteins arranged in longitudinal rows called _________. a. Prototubulins b. Microfilaments c. Myofibrils d. Protofilaments e. Prototubules 3. In a normal microtubule, how many protofilaments make up its cylindrical wall? a. 2 b. 22 c. 12 d. 13 e. 94. Hmmm… Microfilaments have? a. Dyneins b. Myosins c. Kinesins … And which way do they walk? a. To the + end b. To the – end c. To the bakery by the old shoe store … So which end of the actin is at Z line of the sarcomere? a. (+), (even though the – end is usually the base) b. (-), (even though the + end is usually the base) c. (+), (it doesn’t matter, both + and – ends can be the base of the actin strand)
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d. Both a and c, since actin aren’t microtubules, they can have a (+) at the Z line (base) . I’m just confused 5. In electron micrographs of animal cells, microtubules are seen to radiate out from the _________ of the ___________ (This is a wordy Q like what’s on the test, just take your time and picture everything in your head) a. pericentriolar material, centrioles b. centrosome, pericentriolar material c. pericentriolar material, centrosome d. mitochondrion, pericentriolar material e. centrosome, centriole f. centriolar material, centrosome
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