HIV in semen and vaginal fluid may enter a partner's body via the epithelium lining the
a. penis.
b. vagina.
c. rectum.
d. mouth in some instances.
e. all of these
E
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Gammaproteobacteria can be used for biodegradation of hydrocarbons
Indicate whether the statement is true or false.
In an antibody- mediated immune response,
what causes effector helper T cells to release cyokines?
a. binding to antigen presenting dendritic cells b. binding to a bacterial complement c. binding to a naive helper T cell d. binding to a B cell e. engulfing a bacterium
Identify the key feature of the action potential that ensures it will travel only one direction.
A. the activation state of the voltage-gated Na+ channel B. the temporary cessation in activity of the Na+/K+ pump C. the inactivation state of the voltage-gated K+ channel D. the activation state of the voltage-gated K+ channel E. the inactivation state of the voltage-gated Na+ channel
Benthic algae are found
A. near the ocean shore. B. floating on the ocean surface. C. only in fresh water. D. in the deep parts of the ocean.