Latrunculin a Is a Reversible Toxin That Disrupts the Formation

question 8

Multiple Choice

Latrunculin A is a reversible toxin that disrupts the formation of actin fibers.A culture of a particular species of diatom was treated with this toxin diluted in a buffer,while another culture was treated only with the buffer (no toxin;control) .The motility of cells in each culture was assessed by counting the number of cells that were moving during a defined period of time.Which of the following conclusion statements is reasonable based on the data in the bar graph presented below?

• A)Formation of actin fibers is not necessary for the movement in this species of diatom.
• B)The buffer alone largely inhibited movement in this species of diatom.
• C)In this species of diatom,fully formed actin fibers are necessary for movement.

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Definitions:

Decreasing Cost Industry

An industry where an increase in production leads to a decrease in the average cost of producing each unit, often due to economies of scale.

Marginal Cost

Marginal cost refers to the increase in total cost that arises from producing one additional unit of a good or service.

Block Pricing

A pricing strategy where different quantities of a product or service are sold at different prices, usually implying that larger quantities are sold at a lower per-unit price.

First-Degree Price Discrimination

Practice of charging each customer her reservation price.