21. Which of the following is not part of the cytoskeleton? a. actin filaments b
ID: 260694 • Letter: 2
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21. Which of the following is not part of the cytoskeleton? a. actin filaments b. cell wall fibers c. intermediate filaments d. microtubules 22. Microtubules are complex structures. Which order of size, from the smallest to the largest is correct? a. Protofilament, microtubule, tubulin dimer, mitotic spindle b. atubulin, tubulin dimer, protofilament, microtubule c. Tubulin dimer, mitotic spindle, protofilament, microtubule d. Microtubule, mitotic spindle, protofilament, tubulin dimer 23. Which of the following cellular components could stabilize microtubules: a. GDP b.ATP c. capping lipids d. capping proteins 24. Cholesterol is not used for which of the following: a. Making the membrane less fluid b. Making the membrane more fluid c. Bile acids and salts synthesis d. Steroid hormone synthesis 25. Chaperone proteins are critical for import of proteins in which of the following organelles: a. Mitochondria . Nuls c. Chloroplast d. Both a. and c.Explanation / Answer
21) The correct option is b. cell wall fibers.
Microtubules, intermediate filaments and microfilaments are three main parts of the cytoskeleton.
22) The correct option is alpha-tubulin, Tubulin dimer ,Protofilament and Microtubule
alpha-tubulin, Tubulin heterodimer, Protofilament and Microtubule are structures in order of size, from the smallest to the largest of microtubule.
23) The correct option is d.capping proteins.
Capping Proteins stabilize microtubules. They prevent ends from falling apart.
24) The correct option is a. Making the membrane less fluid
Cholesterol makes the membrane more fluid then the phospholipids. Therefore cholesterol makes the membrane more fluid.
Bile salts and bile acids are polar cholesterol derivatives. They represent the major pathway for the elimination of the steroid from the body.
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