Which of the following is not true of a codon?
A. It consists of three nucleotides.
B. It is the basic unit of the genetic code.
C. It extends from one end of a tRNA molecule.
D. It may code for the same amino acid as another codon.
E. It never codes for more than one amino acid.
Answer: C. It extends from one end of a tRNA molecule.
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Which of the following is TRUE when comparing solutions with a pH of 6 and a pH of 8?
A. The solution with a pH of 8 has a 100 times higher concentration of hydrogen ions than a solution with a pH of 6. B. The solution with a pH of 8 has a 2 times higher concentration of hydrogen ions than a solution with a pH of 6. C. The solution with a pH of 8 has a 100 times lower concentration of hydrogen ions than a solution with a pH of 6. D. The solution with a pH of 8 has a 2 times lower concentration of hydrogen ions than a solution with a pH of 6. E. The hydrogen ion concentration does not appreciably differ between a solution with a pH of 8 versus that with a pH of 6.
The vector for Rocky Mountain spotted fever is the ________.
A. mosquito B. tick C. flea D. louse
Two host races of apple maggots have appeared within the past 100 years. This suggests that they may
be undergoing
a. parapatric speciation. b. allopatric speciation. c. sympatric speciation. d. genetic drift. e. development of a hybrid zone.
G = green leaves g = yellow leaves N = naturally shapedleaves n = curly leaves Individuals with the heterozygous genotype of GgNn repeatedly produce haploid gametes consisting of the alleles GN, Gn, gN, and gn. Which law best represents this phenomenon?
A. Law of Meiosis B. Law of Dominance C. Law of Crossing Over D. Law of Independent Assortment