An antagonist to a receptor decreases the number of messengers bound to the receptor.
a. true
b. false
Answer: a. true
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Viruses variously depend on their host cell for parts of the viral replication and maturation process. Many viruses do however encode for some enzymes that facilitate certain steps or virus-specific processes for viral replication and maturation
Which cellular processes and enzymes do ALL viruses lack and must therefore ALWAYS be supplied by the host cell? What will be an ideal response?
Which of the following eukaryotic organelles
are believed to have existed as independent prokaryotes in the past?
a. peroxisomes b. chloroplasts c. mitochondria d. lysosomes e. more than one of these
An unprotected area of naturally occurring plant and animal assemblages that is surrounded by unsuitable territory due
to development or habitat destruction is referred to by biologists as: a. an island. b. ex situ conservation. c. a reserve. d. a park. e. a refuge.
Predators often feed on weak or sick animals in an ecosystem. The role of the predator is described as its
A. community B. habitat C. niche D. population