Animals that lack a body cavity to separate the gut from the muscles of the body wall are referred to as ____
a. pseudocoelomates
b. mesenteries
c. acoelomates
d. indeterminates
e. coelomates
ANSWER: c
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Which of the following observations may have resulted in the hypothesis that a codon is made up of three bases?
A) A codon of two bases in length, from four different bases, would code for a maximum of thirty-two different amino acids. B) A codon of three bases in length, from four different bases, would code for a maximum of twelve different amino acids. C) A codon of four bases in length, from four different bases, would code for a maximum of twenty-four different amino acids. D) A codon of three bases in length, from four different bases, would code for a maximum of sixty-four different amino acids.
The geographical distribution of hominids changed
dramatically during the Pleistocene due to the migrations of a. Australopithecus robustus. b. Australopithecus boisei. c. Homo erectus. d. Homo habilis. e. Homo sapiens.
External respiration is the process of
A) transporting gases in the blood stream to target cells. B) exchanging air in lungs with the surrounding environment. C) moving gases into or out of the blood stream within lung tissue. D) gas uptake by target cells. E) carbon dioxide release by cells into the bloodstream.
Which one of the following diseases is caused by a virus that is introduced to the body through the skin and travels along sensory neurons to the brain?
A) meningitis B) rabies C) epilepsy D) Alzheimer's disease E) Parkinson's disease