Immature seed cones of conifers are usually green before pollination, and flowers of grasses are inconspicuously colored. What does this indicate about their pollination?
A) They self-fertilize and do not need pollen carried from one plant to another.
B) Their pollinating insects are color blind.
C) They are wind pollinated.
D) They probably attract pollinators using strong fragrances.
C
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Which cellular pathway carries information about color and detail from the optic nerves to the brain?
a. mesocellular b. magnocellular c. parvocellular d. pseudocellular
During presentation of APC-bound antigen, macrophages and dendritic cells secrete the cytokine ________, which activates T helper cells.
A. histamine B. interleukin-2 C. interferon D. interleukin-1
Four of the five vessels listed below carry the same
quality of blood. Select the exception. a. pulmonary artery b. aorta c. hepatic portal vein d. inferior vena cava e. jugular vein
All of the following pertain to cephalosporins exceptÂ
A. greater resistance to beta-lactamases. B. newer generations have activity against gram negatives. C. many administered by injection not orally. D. they have a beta-lactam ring. E. they are synthetic drugs.