Ringlike patterns on an earthworm and "six-pack abs" in humans are evidence of ____ in an animal's body plan
a. cephalization
b. segmentation
c. radial symmetry
d. mesenteries
e. cleavage
ANSWER: b
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The domains of life arose as barriers between gene exchange evolved between organisms
Indicate whether the statement is true or false.
We maintain a fairly constant body temperature despite exposures to different seasons or external temperatures. This is achieved through our capacity to
A. adapt to changing environments. B. regulate body temperature. C. maintain homeostasis. D. All of these choices are correct. E. None of these choices are correct.
A buffer
A) is an acid that is used to offset overly basic conditions in the body. B) is a base that is used to offset overly acidic conditions in the body. C) donates H+ ions when conditions become too basic and accepts H+ ions when conditions become too acidic. D) donates OH- ions when conditions become too basic and accepts OH- ions when conditions become too acidic.
During the 1970s, ________ pioneered the use of SSU rRNA gene sequencing to be used for distinguishing among taxa
a. Carl Linnaeus b. Carl Woese c. David Bergey d. James Watson