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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

Light-dependent reactions generate

A. glucose. B. ATP and NADPH. C. light. D. NADP+. E. CO2.

Biology & Microbiology

What cellular structure protects bacteria from drying out?

A. Cytoplasmic membrane B. Fimbriae C. Peptidoglycan D. Glycocalyx

Biology & Microbiology