There is a range of color in mice from black to brown to gray to white. In a region of white sand there is a black volcanic deposit. The white mice survive better on the white sand and the black mice survive better on the black volcanic deposit. This could be an example of
A. sexual selection.
B. disruptive selection.
C. directional selection.
D. stabilizing selection.
B. disruptive selection.
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In bacteria, it is common to produce polycistronic messages; in eukaryotes it is less common. Describe how polycistronic mRNAs are made and processed in prokaryotes and eukaryotes. How might polycistronic mRNA molecules be an advantage for eukaryotes?
What will be an ideal response?
Chromatin condenses to form discrete, visible chromosomes
a. early in G1. b. during S. c. during telophase. d. during prophase. e. at the end of cytokinesis.
In correct chronological order, the three phases of the human uterine cycle are _____
A) follicular ? luteal ? secretory B) menstrual ? proliferative ? secretory C) follicular ? ovulation ? luteal D) proliferative ? luteal ? ovulation
Thiobacillus thiooxidans is found in an environmental sample. Which of the following should then apply to this sample?
A. The sample is very acidic. B. The sample contains lithotrophs. C. The sample contains microbes that oxidize sulfur to sulfates. D. All of the choices are correct.