Muscle cells differ from nerve cells mainly because they _____ a. express differ

Question

Muscle cells differ from nerve cells mainly because they _____ a. express different genes b. contain different genes c. use different genetic codes d. have unique ribosomes e. have different chromosomes Which method is utilized by eukaryotes to control their gene expression that is NOT used in bacteria? a. Control of chromatin remodeling b. Control of RNA splicing c. Transcriptional control d. Control of both RNA splicing and chromatin remodeling e. Control of chromatin remodeling, RNA splicing, and transcription Which of the following mechanisms illustrates a form of transcriptional repression that is unique to eukaryotes? a. Repressors blocking RNA polymerase by binding an operator site within the erase promoter b. Repressors recruiting enzymes to modify groups on histones to compact chromatin c. Repressors binding to its ligand (molecule which binds the protein), changing its conformation and then binding DNA d. Repressors recruiting enzymes to modify groups on histones to loosen chromatin A nucleosome forms hydrogen bonds with what part of the DNA? a. With the phosphodiester backbone and with bases via the minor groove b. Only with bases via the major groove in a sequence dependent manner c. Only with bases via the minor groove in a sequence dependent manner d. With the phosphodiester backbone and with bases via the major groove A eukaryotic gene is most likely to be transcribed if it is located where? a. In a region of the genome in which the histones are methylated b. In a heterochromatic region of the genome c. In a region of the genome in which the histones are acetylated d. In a region of the genome in which the histones are unmodified

Explanation / Answer

I am answering first four questions.

Ans 13. a. Muscle cells express different genes compared to nerve cells and this is the basis of cell specialisation.

Ans 14. d. Bacteria only possess transcription control while eukaryotes show regulation of gene expression at multiple levels including chromatin remodelling and RNA splicing.

Ans 15. C. Gene specific repressors bind to DNA directly or indirectly in eukaryotes.

Ans 16. A. The histone fold shows hydrogen bonds with both, folds in minor groove and with phosphodiesterase backbone .

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