An antagonist to a receptor decreases the number of messengers bound to the receptor.

a. true
b. false


Answer: a. true

Biology & Microbiology

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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?

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology