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

question 16

Multiple Choice

Certain unicellular eukaryotes, including diatoms and some yeasts, have mechanisms of nuclear division that 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:

Null Hypothesis

A statement used in statistics that proposes there is no significant difference or effect, serving as the default assumption to be tested against an alternative hypothesis.

Test Statistic

A statistic (a function of the data) used in statistical hypothesis testing to decide whether to reject the null hypothesis.

P-value Approach

A method in hypothesis testing that uses the p-value, the probability of obtaining test results at least as extreme as the observed, under the assumption the null hypothesis is true.

Critical Values

Specific points along the scale of a test statistic that delineate the acceptance or rejection of the null hypothesis.