Movement in the anterior-posterior plane that decreases the angle between articulating bones is which movement?
A) flexion
B) hyperextension
C) elevation
D) retraction
E) protraction
A) flexion
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What hormone decreases plasma calcium levels?
A) calcitonin only B) 1,25-dihydroxy vitamin D3 only C) parathyroid hormone only D) both calcitonin and 1,25-dihydroxy vitamin D3 E) both calcitonin and parathyroid hormone
Introns represent a genome scrap yard that provides DNA segments for genome evolution and a variety of small RNA molecules
Indicate whether the statement is true or false
Check all of the major hypotheses of aging.
A. Damage to mitochondria B. Presence of a "cell death clock" C. Damage to lysosomes D. Damage to the DNA from free radicals E. Presence of "death genes"
The largest internal cellular structure is known as the ________ and is the cell's control center.
A. cytosol B. smooth ER C. lysosome D. nucleus E. Golgi apparatus