Substance A is synthesized in the liver, travels through the circulatory system bound to a carrier protein, and causes a
change in gene expression in a target cell. This is an example of ____.
a. autocrine signaling
b. paracrine signaling
c. long-distance signaling
d. local signaling
e. communication by direct contact
ANSWER: c
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T cell independent antigens lead to a memory response
Indicate whether this statement is true or false.
Adjacent nucleotides on a strand of DNA are connected to each other by a(n) ____
a. hydrophobic interaction b. phosphodiester bond c. hydrogen bond d. peptide bond e. ionic bond
In the Northern Hemisphere, when does the summer solstice occur?
A) when the sun reaches its northern maximum B) when the South Pole is closest to the sun C) when solar irradiance is at its minimum D) when lengths of day and night are equal at all latitudes
____ muscle cells are mononucleated and fusiform in shape
Fill in the blank(s) with the appropriate word(s).