Rous sarcoma virus was identified when a scientist discovered that a virus passing between chickens was causing their tumors. The genome of this retrovirus includes the src gene, which encodes a tyrosine kinase that functions in signaling pathways leading to proliferation. The src gene is a
A) cyclin.
B) proto-oncogene.
C) reverse transcriptase.
D) tumor-suppressor gene.
B) proto-oncogene.
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Migration, genetic drift, and mutation are like natural selection in that they:
A. result in evolution of a population. B. may alter the allele frequency in a population. C. may alter the genotype frequency in a population. D. are all methods of evolutionary change. E. All of the answer options are correct.
Mutations in bacterial porins can lead to antibiotic resistance typically by
A) closing the ?-helix of the porin. B) limiting the passage of nonpolar substances. C) blocking entry of the antibiotic. D) disrupting the voltage of the gated channel. E) all of the above
When ionic bonds are formed
1.atoms share electrons. 2.atoms either gain or lose electrons. 3.the atomic number of an atom changes. 4.isotopes are formed.
Which of the following statements about DNA structure is true?
a. The nucleic acid strands in a DNA molecule are oriented antiparallel to each other. b. The arrangement of the sugar-phosphate groups determines the genetic code. c. Phosphodiester bonds form between the phosphate group of one nucleotide and the 5' carbon of the adjacent nucleotide. d. DNA is always synthesized in the 3' to 5' direction.