Antibodies perform all of the following functions EXCEPT ____
a. activate complement
b. provide protection in secretions
c. directly destroy and remove foreign antigens
d. act as B cell receptors
e. bind and neutralize blood toxins
ANSWER: c
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The liver functions to
(a) produce bile. (b) pump blood. (c) form urea. (d) do both a and c.
After activation, these cells have the ability to move toward an enemy cell, press up against its surface, and make holes in it.
A. cytotoxic T-cells B. T-regulator cells C. antigen-presenting cell (APCs) D. B-cells
Plants grow toward light through the action of
A) hormones. B) nerves. C) phytochrome. D) chloroplasts.
An unrooted tree linking three species is shown above. Draw all possible unrooted tree conformations when a fourth species, D, is added to the tree
What will be an ideal response?