If a codon is three nucleotides and there are four different nucleotides, how many different codons can be made?
A) 64 B) 3 C) 28 D) 120 E) 12
Answer: A
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Adaptive radiation is likely to have led to which of the following?
A. The divergence of a single pea aphid population into two distinct species. B. The evolution of the horse via changes in climate and food supply. C. The long period of equilibrium in a bat species in the Mariana Islands. D. The 1,000 species of Drosophila found dispersed throughout the Hawaiian Islands.
What important structure uses lenticels to communicate with the atmosphere in mangroves?
a. Pneumatophores b. Aerenchyme c. Chromatophores d. Nutritive roots
What region of the cardiovascular system contains valves?
A) heart only B) metarterioles only C) veins only D) both the heart and veins E) the heart, metarterioles, and veins
Polycistronic mRNAs encode Polycistronic mRNAs encode
A) one product that is alternatively spliced. B) more than one protein. C) multiple cis elements. D) exclusively eukaryotic proteins. E) None of these.