Animals that produce most of their own heat as by-products of metabolism are (select all correct choices):
A. endotherms.
B. active over a broad range of external
temperatures.
C. likely to respond to cool temperatures with
peripheral vasodilation.
D. unable to carry out fermentation in
anaerobic conditions.
E. most active in the heat of the daytime.
A,B
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Which of the following is a way to prevent attenuation and maintain virulence in a bacterium?
A) laboratory subculture B) animal passage C) polymerase chain reaction (PCR) D) antibiotic therapy
The fibrous sac that encloses the heart is the ________.
A. myocardium B. epicardium C. ectocardium D. pericardium E. endocardium
Which of the following sequences could be cut by a restriction enzyme?
A. ACAAGA B. AATTACC C. CATTAC D. ACTACT
Nearly all viruses are constructed of
A. RNA with a protein wrapping, called a capsid. B. DNA with a protein wrapping, called a capsid. C. either DNA or RNA with a protein wrapping, called a capsid. D. either DNA or RNA, however many do not have the capsid.