If a trait is X-linked dominant, who would express the trait?
A) females homozygous for the dominant allele and males hemizygous for the recessive allele
B) heterozygous females and males hemizygous for the dominant allele
C) females homozygous for the recessive allele and males hemizygous for the recessive allele
D) females homozygous for the recessive allele and males hemizygous for the dominant allele
E) significantly more females than males
B
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A simplified form of the Fick diffusion equation is J = KA (C1-C2) where J is the rate of diffusion, K is a constant, A is the area across which diffusion is occurring, and C1 and C2 are the concentrations of the substance on either side of the membrane. Given this, which of the following would INCREASE the rate of diffusion of a solute?
A. An increase in C1 while holding C2 constant B. An equivalent decrease in both C1 and C2 C. An equivalent increase in both C1 and C2 D. A decrease in D E. A decrease in A
Plasmids
A. are essential for survival. B. are found in all bacteria. C. often carry genes controlling pathogenicity. D. are located in microcompartments. E. cannot be passed between organisms.
If the DNA triplets were ATG?CGT, the mRNA codons would be
a. AUG?CGU. b. ATG?CGT. c. UAC?GCA. d. UAG?CGU. e. CGT-ATG.
If you were designing a method to specifically inhibit prokaryotic transcription, but not eukaryotic transcription, interfering with which of the following would work best?
A) an intercalating agent B) recognition of the prokaryotic promoter by RNA polymerase C) DNase activity D) RNA polymerase II activity E) ribosomal binding to mRNA