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
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The ureters drain urine into the
(a) renal pelvis. (b) cecum. (c) urinary bladder. (d) small intestine.
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.
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
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?