In order to activate the cell mediated immune response, which event must occur?

a. A naïve helper T cell must bind to an antigen-presenting dendritic cell.


b. A naïve B cell must be activated in order to activate the effector helper T cell.
c. A free bacterium must pass through a lymph node where it will directly activate the effector helper T cell.
d. A damaged or infected body cell must pass through a lymph node in order to activate T cells.
e. Antibodies must bind to naïve helper T cells.

Biology & Microbiology

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A test cross of an organism of unknown genotype is done when the organism is crossed to an organism that is:

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In a mammal's bloodstream, where would you expect to find oxygen? Select all correct

A. dissolved in blood plasma B. attached to the heme group of myoglobin in red blood cells C. attached to the heme groups of hemoglobin in red blood cells D. attached to the heme group of myosin in red blood cells E. dissolved in hemolymph

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Her study includes _____ organisms, _____ populations, and _____ communities

a. 60; 3; 2 b. 3; 2; 60 c. 2; 3; 60 d. 60; 2; 3

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How is it possible for water to defy gravity and travel from the roots to the tops of plants? Use the

tension-cohesion model to explain your answer. What will be an ideal response?

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