The observation that, when several nucleotide triplets encode the same amino acid, one tends to be used in genes more frequently is called
a. mutational bias.
b. genetic drift.
c. codon bias.
d. synonymous substitution.
e. gene conversion bias.
Ans: c
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Cephalization is:
A. embryonic development of the head in advance of the rest of the body B. concentration of the sensory organs on the posterior end of the body C. concentration of the sensory organs on the anterior end of the body D. an evolutionary degeneration of the head as seen in some parasites E. a malformation of the head
Which of the following interactions is an example of mutualism?
a. nitrogen-fixing bacteria in the root nodules of legumes b. the sea anemone and the pink anemone fish c. all of the choices d. the yucca plant and the yucca moth
Answer the following questions true (T) or false (F)
1. Pioneers are the first invaders of a newly exposed habitat. 2. The biotic factors in an ecosystem include all organic materials, living and nonliving. 3. Photosynthesis is the main process by which carbon dioxide moves from the atmosphere to biomass.
What percentage of the population are under the age of 15 in West Africa?
A. ~65 B. ~15 C. ~25 D. ~50 E. ~8.5