Paired homologous chromosomes are found at the
spindle equator during
a. metaphase I.
b. telophase I.
c. prophase II.
d. metaphase II.
e. anaphase II.
Answer: a
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The ability of some organisms to alter their membrane lipid composition in response to temperature is known as ________.
Fill in the blank(s) with the appropriate word(s).
You find a protist that is unicellular, heterotrophic, and non-flagellated. It has two nuclei of different
sizes. You correctly conclude that this organism is a(n)
a. kinetoplastid. b. plasmodial slime mold. c. ciliate. d. foraminiferan. e. ameobozoan.
The role of a sphincter is to
a. control the passage of materials. b. create a churning motion. c. propagate peristalsis. d. absorb excess water from feces. e. do more than one of these
What is the difference between a gene that is derepressed and one that is induced?
A. Genes that are derepressed are turned on because an inducer molecule is present. By comparison, a gene that is induced is turned on because a repressor protein is bound to the operator. B. There is no difference between a gene that is derepressed and one that is induced. C. A gene that is derepressed is turned on because a repressor protein is not bound without its cofactor. By comparison, a gene that is induced is turned on because an inducer molecule prevents binding of the repressor. D. A derepressed gene is turned off and an induced gene is activated to be expressed.