Some bacteria have a water-soluble outer slime layer composed of
A) carbohydrate.
B) lipid.
C) peptidoglycan.
D) protein.
E) lipoteichoic acid.
A
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If the map distance between genes A and B is 20 map units and the map distance between genes B and C is 35 map units, what is the map distance between genes A and C?
A) 15 map units B) 55 map units C) More information is needed to distinguish between 15 and 55 map units. D) Gene C must be located on a different nonhomologous chromosome.
Which of the following is a diploblast?
a. A comb jelly b. A goat c. A spider d. An octopus
Nociceptors:a
may be thermal, mechanical, or even chemical. b. always result in the perception of pain. c. transmit signals directly to interneurons in the brain when stimulated. d. are immune to sensitization. e. are insensitive to endogenous opiates, but can be suppressed by synthetic forms.
Which of the following is a correct partial sequence of the structures through which blood flows in a single pass through the human circulatory system?
A. left atrium, left ventricle, aorta, arteries, capillaries. B. capillaries, veins, vena cava, right atrium, right ventricle. C. right atrium, right ventricle, pulmonary arteries, capillaries. D. capillaries, pulmonary veins, left atrium, left ventricle. E. all of the above. F. none of the above.