A botanist describes a particular plant as a perennial. Which best describes this plant to a nonbotanist?
A. It lives for many growing seasons.
B. It lives only one growing season.
C. It has a lot of showy flowers.
D. It lives for two growing seasons.
A. It lives for many growing seasons.
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Recent discoveries of fossils that surprisingly retain some coloration are the result of the preservation of:
A. preserved proteins. B. preserved DNA in the nucleus of a cell. C. preserved lipids such as cholesterol. D. cellular melanosomes that produced pigments.
The difference between an overt and a covert bioterrorism event is that a(n):
a. covert event is one that is carried out against undercover agents. b. covert event is announced, and an overt event is not announced. c. overt event is announced, and a covert event is not announced. d. overt event is one that is carried out in the air.
Squirrels in cities are accustomed to humans and will continue to forage in their presence. What term best describes this behavior?
a. learned behavior b. imprinting c. desensitization d. habituation e. habit formation
The inorganic nonprotein components that participate in enzyme catalysis are known as
A. products. B. coenzymes. C. substrates. D. cofactors. E. reactants.