According to the first law of thermodynamics,
A) chemical reactions are exothermic.
B) entropy tends to increase.
C) potential energy tends to degrade into an unavailable form.
D) energy is neither created nor destroyed.
D
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Melatonin is a hormone made by the pineal gland. People take melatonin to treat sleep disorders as it is known to function in training the circadian rhythm in humans. Chemically, it is a hydroxylated, decarboxylated, acetylated and methylated tryptophan molecule. To which class of hormones would it belong?
a. lipid-derived b. peptide c. amino acid-derived d. glycoprotein
In an area with nitrogen-poor soil, legumes often dominate over other plants because they
A) have long taproots that can extract nitrogen from deeper down in the soil. B) inhibit the growth of denitrifying bacteria around their roots, thus keeping more nitrate in the soil. C) have unique access to the large atmospheric pool of nitrogen thanks to their symbiotic bacteria. D) obtain supplemental nitrogen by trapping insects and other prey. E) do not need nitrogen at all.
element
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