Sodium chloride (NaCl) crystals (table salt) form as a result of:
A) hydrogen bonding.
B) being chemically stable.
C) covalent bonding.
D) the attraction of oppositely charged particles for each other.
Answer: D
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Ingested dietary substances must cross cell membranes to be used by the body. This process is known as _____
A) ingestion B) digestion C) hydrolysis D) absorption E) elimination
Predict the experimental outcome if Hershey and Chase had used a bacterial cell instead of a bacteriophage in the procedure.
A. Radioactivity would be detected in neither the supernatant nor the pellet. B. Radioactivity would be detected in the supernatant but not in the pellet. C. Radioactivity would be detected in the pellet but not in the supernatant. D. Radioactivity would be detected in both the supernatant and pellet.
Choose the letter of the best match: Prevention of egg maturation and ovulation
A. birth control pill B. intrauterine device C. diaphragm D. foams and jellies E. vasectomy
The residence time is equal to the pool size divided by the flux between pools. The pool size of atmospheric carbon (carbon dioxide, methane, etc) is ~750 Pg, and the movement of carbon into the atmosphere from burning fossil fuels is around 7.5 Pg/year. How long does carbon from burning fossil fuels remain in the atmosphere on average?
A) 7.5 years B) 10 years C) 100 years D) 750 years E) There's not enough information to answer