What type of molecule comprises the sensory receptors on the cilia of olfactory neurons?
a. carbohydrates
b. lipids
c. proteins
d. nucleic acids
c. proteins
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Why do researchers think the first self-replicating molecule was RNA?
A) RNA is the only type of molecule that can catalyze a chemical reaction. B) RNA can carry information and catalyze chemical reactions. C) Self-replicating molecules of RNA exist today, in human cells. D) Fossil evidence of such a molecule was recently discovered.
An artificial pacemaker supplements the actions of
a. sympathetic neurons. b. the atrioventricular node. c. the medulla oblongata. d. the sinoatrial node. e. the heart muscle itself
Light-dependent reactions generate
A. glucose. B. ATP and NADPH. C. light. D. NADP+. E. CO2.
What cellular structure protects bacteria from drying out?
A. Cytoplasmic membrane B. Fimbriae C. Peptidoglycan D. Glycocalyx