All of the following statements concerning
Archaea are correct with one exception. Select
the exception.
a. all are single-celled
b. all have DNA
c. none have a nucleus
d. they are most closely related to bacteria
e. some are producers
D
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If researchers never evaluated the amount of 14C in the atmosphere, they could still use 13C levels to demonstrate causation between human activities and increased atmospheric CO2
A. true B. false
Gardasil HPV vaccine consists of
a. viral capsid proteins that assemble into virus like particles (VLPs). b. inactivated HPV. c. synthetic HPV. d. antibodies from infected patients. e. none of these
Why are vasodilation and vasoconstriction the main mechanisms to change blood flow?
A. Sympathetic activation has no effect on blood flow. B. Leakage of fluids from the capillaries has no effect on blood flow. C. Blood hematocrit has no effect on blood flow. D. Blood vessel length is relatively fixed and has no effect on blood flow.
A(n) ____________________ is a testable statement proposed to explain an observation. Fill in the blank(s) with the appropriate word(s)