Melatonin is secreted by the_____
A) hypothalamus during the day
B) pineal gland during the night
C) autonomic nervous system during the winter
D) posterior pituitary gland during the day
B
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DNA is cleaved by various restriction enzymes to generate DNA fragments of sizes 543 bp, 517 bp, 396 bp, and 214 bp. Which fragment will move the fastest in agarose gel electrophoresis?
A. 543 bp B. 517 bp C. 396 bp D. 214 bp E. All of the fragments will move at the same speed.
A stem that cannot increase in diameter is lacking what type of tissue?
A. xylem B. ground meristem C. procambium D. protoderm E. vascular cambium
Greenhouse gases _____
a. help keep Earth's surface warm enough for life b. are released by natural and human activities c. are at higher levels than they were 100 years ago d. all of these
While ________ are involved in bone deposition, ________ are involved in the breakdown of bone tissue
Fill in the blank(s) with correct word