Which of the following is an intracellular parasite of humans that usually causes a mild pneumonia?
A) Anaplasma phagocytophilium
B) Chlamydophila pneumoniae
C) Chlamydophila psittaci
D) Ehrlichia chaffeensis
E) Rickettsia typhi
B
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Select the true statement(s) concerning natural selection.
_____ Natural selection is a way for evolution to occur. _____ Natural selection results in better adapted populations when the environment is constant. _____ Natural selection does not act on individuals. _____ Natural selection is evolution.
Life emerged from the oceans 400 million years ago
a. True b. False Indicate whether the statement is true or false
Which enzyme is responsible for integration of a temperate phage into a host genome?
A) ?-galactosidase B) transposase C) integrase D) transacetylase E) permease
Why is the Hardy-Weinberg principle important, since genetic equilibrium seldom occurs in nature? What will be an ideal response?