Decompression sickness occurs when which gas forms bubbles in the blood?
a. oxygen
b. carbon dioxide
c. carbon monoxide
d. methane
e. nitrogen
ANSWER: e
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What is the main factor contributing to the current human-caused mass extinction?
a. increased population growth b. burning of fossil fuels c. the industrial revolution d. global-warming e. decreased population growth
Which of the following represents energy flow in a
grazing food web? a. producers >>> detritivores >>> decomposers b. producers >>> decomposers >>> detritivores c. producers >>> herbivores >>> decomposers >>> carnivores d. producers >>> herbivores >>> carnivores >>> decomposers e. producers >>> herbivores >>> detritivores >>> carnivores
Two probes, A and B, hybridize very near each other in a region of DNA that contains RFLPs when digested with HindIII
The four maps show the location and intervening distances of the HindIII restriction sites and the binding locations of probes A and B. The maps show alleles H1-H4 present in a population. What band(s) is/are seen in Southern blot analysis of a H2H3 heterozygote using probe B? A) 3 kb and 5 kb B) 3 kb and 8 kb C) 3kb, 2kb, and 8 kb D) 5 kb and 8 kb E) 2 kb, 3 kb, and 5 kb
Species of the genus Corynebacterium ________.
A. sometimes divide to form characteristic club-shaped cells B. are harmless saprophytes C. form helical-shaped cells D. form elongated rod-shaped cells