Exam 19: Regulation Of Gene Expression In Eukaryotes

Why is transcriptional control of gene expression more difficult in eukaryotes than in prokaryotes? 1)Genes are sequestered in the nucleus. 2)Eukaryotic cells need fairly elaborate internal signaling systems to control the transcription of DNA. 3)Environmental cues may have to pass through layers of cells in order to have an impact on the transcription of genes in a particular tissue.

How is it possible for a single gene to encode different polypeptides? 1)Post translational processing 2)Alternative splicing during post transcriptional processing 3)Abnormal spliceosome activity during post transcriptional processing

Which of the following statements is true regarding heterochromatin?

In a gene with multiple introns present,what will happen if two successive introns,separated by one exon are removed together at the same time by a spliceosome?

Which of the following would not induce eukaryotic gene expression?

The protein-DNA interactions that control whether or not a gene is accessible to RNA polymerase occur during which phase of gene expression?

Which of the following is true regarding hormone response elements?

Which of the following could be a source for a siRNA or miRNA molecule?

Which level of gene regulation controls the expression of heat shock proteins?

In transcribed DNA,nucleosomes are altered by multiprotein complexes that ultimately facilitate the action of RNA polymerase in a process known as

Which component of a eukaryotic cell can serve as the location for regulation of gene expression?

The use of small RNA molecules to interfere with gene expression is known as

An interaction mediated by base pairing between the single strand of RNA in the RNA-protein complex and a complementary sequence in the messenger RNA molecule prevents the expression of the gene that produced the mRNA.This is known as

Which of the following is a component of eukaryotic and prokaryotic gene regulation?

RISC-associated RNAs that result in mRNA cleavage are usually termed

Compare and contrast the actions of steroid hormones with peptide hormones.

Positive and negative regulator proteins that bind to specific regions of the DNA and stimulate or inhibit transcription in eukaryotes are known as

The nuclease sensitivity of transcriptionally active genes depends on at least two small nonhistone proteins known as

Null mutations in male-specific lethal loci in Drosophila lead to male-specific lethality.Why does this happen and what is known about the function of these genes?

Which of the following is a good example of alternative splicing in eukaryotes? 1)Lac operon 2)Troponin T gene in rats 3)Sex-lethal (Sxl)gene in Drosophila