Certain Unicellular Eukaryotes, Including Diatoms and Some Yeasts, Have Mechanisms

question 27

Multiple Choice

Certain unicellular eukaryotes, including diatoms and some yeasts, have mechanisms of nuclear division that may resemble intermediate steps in the evolution of mitosis. Which of the following is a characteristic feature of nuclear division in these organisms?

• A) They reproduce by binary fission in their early stages of development and by mitosis when they are mature.
• B) They have circular chromosomes that are segregated by a mitotic spindle.
• C) Chromosomes are segregated by a mitotic spindle, but the nuclear envelope remains intact during division.
• D) Chromosomes are segregated by attachment to the plasma membrane.

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Definitions:

Break-even Point

The break-even point is the level of production or sales at which total revenues equal total costs, resulting in no profit or loss.

Break-even

The point at which total revenues and total expenses are equal, resulting in no net loss or gain.

Monthly Dollar Sales

The total sales revenue earned by a business within a month, measured in dollars.

Variable Expenses

Costs that change in proportion to the activity of a business, such as sales or production levels.