Would a two-letter code with four different nucleotides be sufficient to encode the 20 amino acids found in cells? Why or why not? What does the three-letter code imply about the nature of the genetic code?
What will be an ideal response?
A two-letter code would only encode 16 (42 ) amino acids, so it would not be sufficient. A three-letter code generates 64 (43 ) possible codes, which is more than enough for the 20 amino acids found in cells. This implies that some amino acids may be specified by more than one codon.
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The mutation responsible for Huntington's disease is a
A. missense mutation. B. nonsense mutation. C. frameshift mutation. D. triplet repeat expansion mutation.
Bacteria can exchange genes with other
bacteria by a method called
a. binary fission. b. meiotic recombination. c. conjugation. d. translation. e. compilation
The major atmospheric components of Earth, from the lowest concentration to the greatest
concentration, are:a. carbon dioxide, oxygen, and nitrogen. b. carbon dioxide, nitrogen, and oxygen. c. nitrogen, oxygen, and carbon dioxide. d. nitrogen, carbon dioxide, and oxygen. e. oxygen, nitrogen, and carbon dioxide.
Which category is at the top of the classification hierarchy, that is, it includes the rest of the categories given?
A. order B. genus C. class D. family E. phylum