Regarding the evolution of whales, evidence supports that __________ are more closely related to ___________ than to _____________.
Fill in the blank(s) with the appropriate word(s).
Ans: camels, whales, horses
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All the following are adaptations of reptiles both on land and in the ocean except:
a. improved circulatory system over the fishes. b. very efficient kidneys. c. scale-covered skin without glands. d. dark bodies.
In mammals, a decrease in body temperature results in which of the following responses?
(A) Release of thyroxine decreases the rate of metabolism. (B) Blood vessels close to the surface of the skin constrict. (C) vessels in deep muscles constrict so Increased secretion of epinephrine restricts the amount of sugar released into the circulatory system. (D) The adrenal glands increase the release of acetylcholine into the circulatory system. (E) Blood that heat is conserved
In Griffith’s experiments, what made the harmless R cells grow capsules when exposed to heat-killed S cells?
a. Protein b. DNA c. Lipids d. Polysaccharides
G protein-coupled receptors are important molecules involved in signal transduction. Which of the following statements about G protein-coupled receptors is true?
a. They are activated only by steroid hormones. b. They bind only guanine nucleotides. c. They bind both adenine and guanine nucleotides. d. They generally contain seven membrane-spanning ? helices.