Briefly discuss physiological mechanisms that regulate body temperature in endotherms. What will be an ideal response?
Mechanisms include changing metabolism via hormones, contracting muscles via shivering,
evaporation of water via sweating, and the vasodilation/vasconstriction of blood vessels.
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Negative transcriptional regulation is conducted by activator proteins
Indicate whether the statement is true or false
NASA has published a list of criteria for identifying fossil bacteria in samples from Mars, as part of a search for evidence of life. Which of the following is good evidence for the presence of bacterial cells?
A. No evidence of water in the surrounding mineral B. Three-dimensional organization of cells in a starburst pattern C. Absence of carbon in the material D. Cell size of 0.5 to 2 microns
One of the most important branch points in the evolution of animals and their nervous systems was the appearance of
A) radial symmetry. B) bilateral symmetry. C) the spinal column. D) specialized cells for transmitting signals.
Which of the following sequences of DNA would most likely be damaged by UV radiation?
A. AGTTCGCTT B. ATAGAGCGC C. AGAGCGCAT D. AGTACGCAT