The "lub" heart sound represents
a. a heart murmur.
b. closure of the AV valves.
c. closure of the SL valves.
d. hypertension.
e. movement of actual heart muscle.
B
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In the preceding experiment, bacteria that form blue colonies on X-gal/IPTG LB agar containing antibiotic also contain
a. a gene for antibiotic resistance. b. an active lacZ gene. c. an inactive lacZ gene. d. both a and b.
The bone tissue that consists of units called osteons is called _____ bone tissue
Fill in the blank(s) with correct word
Mechanoreceptors are not evenly spaced on your body. What is an advantage of having mechanoreceptors located closer together?
A) allows for less sensitivity to potentially harmful stimuli B) allows for a greater sensitivity to changes in temperature C) allows for a greater sensitivity to potentially harmful stimuli D) allows for less sensitivity to changes in temperature
Which way do ocean currents circulate in the Northern Hemisphere?
a. counterclockwise b. clockwise c. away from continents
d. toward the shore e. parallel to the direction of the shore