If blood transports hormones throughout the body, how do they communicate with specific targets?
A. Axonal pathfinding mediates the delivery of hormones to their specific targets.
B. Special gateway valves in the blood vessels direct hormones to their target tissues.
C. Only target tissues have receptors that allow them to receive the signal.
D. Special carrier proteins "walk" along microtubule tracts to deliver the hormones to their targets.
Answer: C
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A. through differences in cell size and shape B. through the fact that archaeons have linear and not circular chromosomes C. through differences in ribosomal RNA sequences D. through the lack of horizontal gene transfer in archaeons E. through the observation that archaea cell size is independent of diffusion
Transformation involves contact between two bacterial cells, followed by the unidirectional transfer of plasmid genes
Indicate whether the statement is true or false.
The secondary cell wall is always located outside the primary cell wall
____________________ Indicate whether the statement is true or false.
Which substance is not an element?
A. Chlorine B. Oxygen C. Carbon D. Water E. Hydrogen