Which one of the following molecules has a carboxyl functional group?
A. R-NH2
B. R-COH
C. R-COOH
D. R-OPO3-2
E. R-SH
Ans: C. R-COOH
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How would ecological efficiency change if all humans became vegetarians?
What will be an ideal response?
People often pick up and "adopt" baby wild animals, which then leads to a set of dependent behaviors that the young animal learns very rapidly. The dependent behaviors will be retained through life, endangering the survivability of the animal around people or in the wild. This behavior is learned by
A. observation. B. imprinting. C. reflex. D. habituation. E. taxis.
Which of the following statements is true?
a. Presently, extinctions are occurring at a very slow pace. b. Mutations, both contemporary and prehistoric, have been the single greatest cause of extinctions. c. The fossil record indicates that there has been very little animal extinction until recently. d. Evolutionary history is often represented by extinctions. e. Organisms compete for limited resources in all environments, possibly leading to extinctions of some.
The evolution of photosynthetic organisms required a source of hydrogen for the synthesis of complex, high-energy molecules. What is the source of hydrogen for today's photosynthetic organisms?
a. sugar b. water c. amino acids d. hydrogen sulfide e. air