Which operons are always transcribed unless deactivated?
a. Inducible operons
b. Repressible operons
c. Inducible and repressible operons
Answer: b. Repressible operons
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Which of the following methods allows monitoring of the progressive destruction of CD4 T cells during an HIV infection by tagging the cells with specific antibodies to CD4 surface proteins and measuring their concentrations in serum?
A. Western blot B. ELISA C. FACS D. Latex beads agglutination E. FA test on a microscope slide
What is the primary method by which zebra mussels have traveled beyond the Great Lakes?
a. attached to animals b. attached to boats c. attached to plants d. via water currents
Lyme disease is a bacterial disease that is transmitted to humans when a black-legged tick that
is infected with the bacterium bites and feeds on a human. In this scenario, the tick is an example of a __________.
a. cyst b. vector c. primary host d. pathogen
Aristotle believed that
A) species evolve through natural selection and other mechanisms. B) an individual's use of a body part causes it to further evolve. C) species are fixed (permanent) and perfect. D) the best evidence for change within species is seen in fossils.