How does the hypothalamus act to maintain body temperature? Include behavioral and physiological responses to both heat and cold
What will be an ideal response?
The hypothalamus has nerves that both sense and respond to temperature. If the temperature of the blood bathing the hypothalamus falls below its set point, the hypothalamus will trigger responses that produce and conserve heat: behavioral changes (shivering and huddled posture) and physiological changes (vasoconstriction of peripheral blood vessels). If the temperature rises above its set point, the hypothalamus will trigger mechanisms to reduce heat production and unload heat: behavioral changes (lethargy and sprawled posture) and physiological changes (vasodialation of peripheral blood vessels and sweating to cool the surface in which these vessel run).
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Hemoglobin transports oxygen in the blood and consists of a chain of 146 amino acids. How many different types of amino acids are used to construct proteins?
A. 2 B. 20 C. 146 D. 200
An organ that is hygroscopic
(a) is sensitive to changes in moisture. (b) is exemplified by the peristomal teeth in the sporophyte of mosses. (c) may aid in spore dispersal in mosses. (d) is all of the above.
Of all the different codons that exist, three of
them a. are involved in mutations. b. do not specify a particular amino acid. c. cannot be copied. d. provide instructions such as STOP. e. do not specify a particular amino acid and provide instructions such as STOP
A set of regulator genes is known to be very similar in both humans and flies. This fact is used to indicate what about the two species?
What will be an ideal response?