The chemical structure of the 5' mRNA cap includes ______________ covalently linked to the 5' terminal residue of the mRNA through a ______________ linkage.
A. 7-methylguanosine / 5' to 3' phosphodiester
B. N-formyladenosine / 5' to 3' diphosphate
C. 7-methylguanosine / 5' to 5' triphosphate
D. 7-methylcytosine / 5' to 5' phosphodiester
Which of the following is not a function of histone H1?
A. stabilizing nucleosomes
B. promoting higher order chromosome structure
C. enhancing the repression of transcription by nucleosomes
D. binding to regions undergoing active RNA synthesis
E. All of these options are functions of histone H1
Double-stranded DNA absorbs less UV light than single-stranded DNAbecause:
A. base stacking in double-stranded DNA increases the absorbance of white light and causes a decrease in the amount of UV light it can absorb. This decrease in UV absorbance is called the hyperchromic effect.
B. the bases are on the inside of the helix, inaccessible to the UV light in double-stranded
DNA.
C. in single-stranded DNA the bases are not interacting so more photons can be absorbed by the pentose rings.
D. single-stranded DNA actually absorbs more of the UV light, making less light available to double-stranded DNA.
E. of the hypochromic effect that results when hydrogen bonding and base stacking in double-stranded DNA limits resonance in the aromatic rings of the bases.
The RecFOR complex is called a recombination mediator. To what function of the complex is this referring?
What will be an ideal response?
Which of the following is a characteristic of the set of genes in an operon that is not true of a regulon?
A. Transcription can produce long polycistronic mRNA that contains multiple genes in each transcript.
B. Each gene of the set usually contains its own Shine-Dalgarno sequence.
C. Regulation of gene expression can occur through activation or repression mechanisms.
D. All of the genes in the set are controlled by a single promoter.
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