Which of the Following Is True About the Structure of the Microtubule

question 14

Multiple Choice

Which of the following is true about the structure of the microtubule wall?

• A)α-β-tubulin heterodimers are arranged with mixed orientation in each protofilament,and protofilaments are arranged with mixed polarity in the microtubule wall.
• B)α-β-tubulin heterodimers are arranged with the same orientation in each protofilament,and protofilaments are arranged with mixed polarity in the microtubule wall.
• C)α-β-tubulin heterodimers are arranged with the mixed orientation in each protofilament,and protofilaments are arranged with same polarity in the microtubule wall.
• D)α-β-tubulin heterodimers are arranged with the same orientation in each protofilament,and protofilaments are arranged with same polarity in the microtubule wall.
• E)Orientation of the α-β-tubulin heterodimers is completely random and depends on which end of the dimer first hits the end of the microtubule when it assembles.

---

Definitions:

Closing Entries

Journal entries made at the end of an accounting period to transfer temporary account balances to permanent accounts, thus resetting the temporary accounts for the next period.

Retained Earnings

The accumulated net income of a company that is retained and reinvested in the business rather than paid out as dividends.

Service Revenue

Income earned by a company for providing services rather than selling physical goods.

Equipment

Equipment consists of the fixed assets a company uses in its operational activities to produce goods or provide services, not intended for sale.