MPF Activity Was Discovered When Cytoplasm from a Xenopus M-Phase

question 63

Multiple Choice

MPF activity was discovered when cytoplasm from a Xenopus M-phase cell was injected into Xenopus oocytes, inducing the oocytes to form a mitotic spindle.In a control experiment, Xenopus interphase cytoplasm was injected into oocytes and shown not to induce the formation of a mitotic spindle.Which of the following statements is NOT a legitimate conclusion from the control experiment?

• A)The piercing of the oocyte membrane by a needle is insufficient to cause mitotic spindle formation.
• B)An increased volume of cytoplasm is insufficient to cause mitotic spindle formation.
• C)Injection of extra RNA molecules is insufficient to cause mitotic spindle formation.
• D)Components of an interphase nucleus are insufficient to cause mitotic spindle formation.

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Definitions:

Scatter Plot

A graphical representation using Cartesian coordinates to display values for typically two variables for a set of data.

Least-Squares Regression

A statistical method used to determine the line that best fits a set of data points by minimizing the sum of the squares of the differences between observed and predicted values.

SPSS

A software package used for interactive, or batched, statistical analysis.

Scatter Plot

A graphical representation displaying values for typically two variables for a set of data, using Cartesian coordinates to display the values.