Which of the following observations may have resulted in the hypothesis that a codon is made up of three bases?
A) A codon of two bases in length, from four different bases, would code for a maximum of thirty-two different amino acids.
B) A codon of three bases in length, from four different bases, would code for a maximum of twelve different amino acids.
C) A codon of four bases in length, from four different bases, would code for a maximum of twenty-four different amino acids.
D) A codon of three bases in length, from four different bases, would code for a maximum of sixty-four different amino acids.
Answer: D
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Imagine in lemmings, that gray fur color (G) is dominant over white (g). There is another gene, called color, and individuals must have at least one “C” allele for gray color to be expressed. You obtain a white lemming that is heterozygous for gray fur color. What is its genotype?
A. ggcc B. GgCC C. Ggcc D. ggCc E. gc
In which of these organisms would their
neutral mutations be most similar to humans?
a. birds b. turtles c. horses d. pigs e. monkeys
Cellulose is
a. a polysaccharide found in cell walls. b. a component of cell membranes. c. an oligosaccharide. d. formed by hydrolysis of monosaccharides. e. a component of invertebrate exoskeletons.
Nondisjunction involving the X chromosomes may occur during oogenesis and produce two kinds of
eggs. If normal sperm fertilize these two types, which of the following pairs of genotypes are possible? a. XX and XY b. XXY and XO c. XYY and XO d. XYY and YO e. XY and XO