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:

Metamemory

Understanding of processes of memory.

Working Memory

A cognitive system responsible for temporarily holding information available for processing, important for reasoning and the guidance of decision-making and behavior.

Phone Number

A sequence of digits assigned to a telephone line that enables it to be reached from other telephones.

Executive Functioning

A set of cognitive processes that include working memory, flexible thinking, and self-control, which are necessary for managing everyday tasks.