The Current Model for the Nucleation of Microtubules Is That

question 43

Multiple Choice

The current model for the nucleation of microtubules is that a helical array of gamma-tubulin subunit forms an open,ring-shaped template on which the first row of alphabeta-tubulin dimers assembles.How does this model account for the polarity of microtubules?

• A)Only the alpha-tubulin of a heterodimer can bind to the ring of gamma-subunits.
• B)Only the beta-tubulin of a heterodimer can bind to the ring of gamma-subunits.
• C)The ring structure straightens out the microtubule.
• D)The ring structure interacts with a homodimer instead of a heterodimer.
• E)Only the alpha-tubulin of a heterodimer can bind to the ring of gamma-subunits.and the ring structure straightens out the microtubule.

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Definitions:

Factory Overhead

Expenses related to operating a factory that cannot directly traced to specific units produced, including utilities, depreciation, and maintenance.

Direct Labor

The labor cost of workers directly involved in the production of goods or the provision of services, considered a variable cost.

FIFO Method

An inventory valuation method where the first goods purchased are the first to be sold, standing for "First In, First Out".

Equivalent Units

A concept used in process costing that converts partially completed units into a number of fully completed units, facilitating the calculation of unit costs.