The Kaibab limestone layer of sedimentary rock is the closest to Earth’s surface; therefore ____
a. it contains fossils of extinct species only
b. it contains the greatest density of fossils
c. it is part of the K-Pg boundary sequence
d. it is the oldest layer
e. it is the youngest layer
ANSWER: e
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Slow-growing NTM whose colonies become pigmented when exposed to light are referred to as:
a. scotochromogens. b. photochromogens. c. nonphotochromogens. d. chromogenicums.
Experiments like those first performed by Miller and Urey demonstrated that
a. amino acids and other organic compounds could form in conditions that mimicked the earth's early atmosphere. b. a lipid-protein film will eventually be formed by thermal convection. c. DNA forms readily and reproduces itself. d. complete, functioning prokaryotic cells are formed after approximately three months. e. meteorites contained organic compounds.
A reflex ____
a. only involves the use of sensory neurons b. is an automatic response to a stimulus that requires considerable thought c. is an automatic response to a stimulus that doesn't require thought d. is an involuntary response that requires only one neuron e. does not require the brain
Although the placenta acts as a filter for many harmful substances, some are able to pass from mother
to embryo. They include a. alcohol. b. toxins in cigarette smoke. c. caffeine. d. drugs. e. all of these.