Scalar quantities and vector quantities have which of the following properties in common?
A. magnitude
B. direction
C. both A and B
D. none of the above
A. magnitude
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The speed of individual particle diffusion is influenced by temperature and particle size, not by concentration
Indicate whether the statement is true or false
Which of the following is the best explanation for our perception of color?
A) Rods contain a single kind of visual pigment. B) Cones come in three types, each sensitive to different wavelengths of light. C) The foveae are densely packed with cones. D) As many as 100 cones may converge on one ganglion cell.
The muscular system is responsible for body movements, maintenance of posture, and
production of body heat. Indicate whether the statement is true or false
Helper T cells:
A. are activated by antigen presented with MHC II proteins. B. secrete antibodies that target specific antigens. C. secrete perforin when activated. D. convert to plasma cells after they are activated. E. do not interact with MHC proteins.