Small circles of DNA that occur in bacteria in addition to the main circular chromosomal DNA molecule are called

____.



a. transformants
b. plastids
c. plasmids
d. plasmitrons
e. bacteriophages


ANSWER: c

Biology & Microbiology

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The ureters drain urine into the

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What occurs during the antigen detection stage of the antibody-mediated immune response initiated by T cell activation?

a. Cytotoxic T cells destroy body cells that are infected with a pathogen b. Helper T cells activate an antigen-specific B cell to divide and secrete antibodies. c. A T cell displaying an antigen-specific T cell receptor (TCR) binds to the antigen on the surface of an antigen presenting cell. d. Helper T cells are activated by the TCR. e. A B cell degrades the pathogen and produces antigens.

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Scientists expect water enriched with 137 Cs to reach the west coast of North America by 2015-2020 due _____

a. rising sea levels b. prevailing winds c. drifting kelp forests d. air currents e. deep marine currents

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Compare the structure and function of three of the following types of blood vessels: arteries, arterioles, veins, venules

and capillaries. What will be an ideal response?

Biology & Microbiology