The DNA of two different viruses, A and B, are isolated and the melting point determined as shown here. Which one of the following is a conclusion consistent with the data?
A. Virus A is an animal virus and virus B is a bacterial virus (bacteriophage).
B. Virus B is triplex DNA and virus A is duplex DNA.
C. Virus B is an RNA-DNA duplex.
D. Virus B has a higher percentage of guanine nucleotides compared to virus A.
E. Virus A has a greater amount of methylated cytosines than virus B.
The stringent response in bacteria is transcriptional regulation coordinated with:
A. amino acid concentrations.
B. availability of glucose.
C. DNA damage.
D. changes in pH.
Comprehension; Hard Which of the following is nottrue of zinc finger motifs?
A. The interaction of DNA with a single zinc finger is relatively weak.
B. The role of the Zn2+ ion is to interact with the negatively charged DNA backbone.
C. Proteins with zinc fingers typically contain multiple copies of the motif.
D. Proteins with zinc fingers typically function as monomers.
An RNA processing event that frequently leads to different protein productsencoded by a single gene is:
A. transcription.
B. alternative splicing.
C. alternative transcription.
D. polyadenylation.
Ribosomal proteins that can act as translational repressors:
A. are not encoded by the same mRNA that they repress.
B. bind to a site on the mRNA near the start site of one gene in the operon.
C. bind to mRNA with higher affinity than to the appropriate rRNA molecule.
D. bind to the mRNA when sensing that levels of r-proteinare low relative to rRNA.
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