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Biology Expert Answers & Study Resources : Page 3

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21) A nonautonomous transposon relies on other transposons for transposition because it A. does not contain transposase recognition sequences. B. does not encodes transposase. C. does not undergo methylation. D. all of the above. 22) When a pregnant female of a particular strain of yellow agouti mice with the agouti viable yellow (Avy) allele was.

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31) Chromatin remodeling by the SWR1 family results in: A. nucleosome sliding B. replacement of a core histone with a variant histone C. nucleosome displacement D. remodeled nucleosomes 32) Which is the correct order of recruitment of transcriptional regulatory proteins to a gene promoter? A. SWI/SNF, histone acetyltransferase (HAT) complex, preinitiation complex B. HAT complex, SWI/SNF, preinitiation.

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1) During a transient transfection assay A. DNA is introduced into a eukaryotic cell and remains extrachromosomal. B. DNA is introduced into a eukaryotic cell and is stably integrated into a chromosome. C. DNA is introduced into bacterial cells for amplification. D. DNA is taken up and packaged in viral capsids. 2) You want to.

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11) X chromosome inactivation in humans is A. random B. nonrandom C. imprinted D. preferential for the paternal X chromosome 12) XIST transcript levels are upregulated A. on the active X chromosome B. on the inactive X chromosome C. on an autosome D. by the expression of Tsix 13) X chromosome inactivation is characterized by a series of epigenetic.

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6) For imprinted genes, selection of the active allele A. does not depend on the parent-of-origin B. can either be random or nonrandom depending on the particular gene C. is random D. is nonrandom 7) Which statement is not true about imprinted genes? A. Imprinting is maintained in the primordial germ cells. B. Nearly all imprinted genes.

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21) The real inducer of the lac operon is A. lactose B. allolactose C. IPTG D. galactose 22) CAP is said to be responsible for positive regulation of the lac operon because: A. CAP binds cAMP. B. CAP binds the CAP binding site. C. CAP prevents binding of the repressor to the operator. D. CAP bound to the CAP.

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16) The wrinkled seed (rr) character of the garden pea described by Mendel is caused by A. insertion of a transposable element B. genomic imprinting C. X chromosome inactivation D. a nonsense mutation 17) DNA transposons move by a(n) A. “copy and paste” mechanism. B. “cut and paste” mechanism. C. “Activator (Ac)-Dissociation (Ds)” mechanism. D. “random walk” mechanism. 18) Retrotransposons.

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6) Promoter strength A. refers to how rapidly transcript elongation occurs. B. refers to the relative frequency of transcription initiation. C. depends on the affinity of RNA polymerase for the promoter region. D. both B and C 7) Which of the following is almost always associated with high levels of transcription? A. use of an alternative.

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1) As a general rule, cytosine DNA methylation marks genes for A. activation. B. silencing. C. mutation. D. programmed gene rearrangements. 2) CpG islands have all of the following characteristics, except: A. They are found near gene promoters. B. They are protected from spontaneous deamination. C. They are typically highly methylated. D. They occur in clusters near the 5′.

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6) What types of proteins bind to promoter-proximal elements? A. the TATA-binding proteins (TBP) B. general transcription factors plus RNA polymerase C. general transcription factors D. regulatory transcription factors 7) The primary difference between an enhancer and a promoter-proximal element is that: A. Enhancers are transcription factors; promoter-proximal elements are DNA sequences. B. Enhancers enhance transcription; promoter.

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58) Consider a Northern blot: (a) Which strand of a DNA probe will hybridize to mRNA on the blot: the anti-sense strand, the sense strand, or both strands? (b) On the diagram of the DNA-RNA hybrid shown below, which bonds form when the DNA probe hybridizes to the mRNA? .

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26) Regulation of the tryptophan operon occurs through A. a tryptophan-activated repressor that binds to operator sites B. transcriptional attenuation by differential folding of RNA C. a ribozyme riboswitch D. both A and B 27) A riboswitch regulates gene expression A. by influencing transcriptional initiation. B. by influencing whether transcription continues to the end of a.

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30) During development, millions of B cell types are produced. Each B cell has a unique antigen receptor generated from different V, D, and J gene segments by a series of A. alternative splicing events during B-cell differentiation B. multiple gene mutation events during B-cell differentiation C. site-specific recombination events during B-cell differentiation D..

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1) A major difference between transcription in bacteria and eukaryotes is that A. transcription and translation are uncoupled in bacteria. B. transcription and translation are coupled in bacteria. C. there is no difference; transcription and translation are coupled in both bacteria and eukaryotes. D. there are many additional levels of control of gene expression.

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26) In plants, heterochromatinization of repeat sequences may be mediated by A. histone hyperacetylation. B. formation of nuclear pore-associated chromatin loops. C. riboswitch-containing mRNAs. D. RNA-directed DNA methylation. 27) During mating-type switching in haploid yeast cells, in the “off” state the recombination enhancer A. represses all mating-type switching B. represses mating-type switching in daughter cells C. represses.

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21) At its isoelectric point A. a protein has a positive charge B. a protein has a negative charge C. a protein has no net charge D. whether a protein has a positive or negative charge depends on the particular protein 22) During the process of two-dimensional PAGE A. the first dimension separates proteins by isoelectric.

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1) Transcription of protein-coding genes in eukaryotes is carried out by A. RNA polymerase I B. RNA polymerase II C. RNA polymerase III D. RNA polymerase; there is only one type of RNA polymerase in eukaryotes. 2) Gene regulatory elements are A. trans-acting transcription factors B. cis-acting transcription factors C. trans-acting DNA sequences D. cis-acting DNA sequences 3) Which of.

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16) Small eukaryotic proteins that are known to add specificity to polymerase-dependent RNA synthesis are known as A. general transcription factors B. mediators C. histones D. elongation factors 17) The unwinding of DNA during the initiation of transcription is mediated by the helicase activity of A. TFIID B. THIIE C. TFIIF D. TFIIH 18) Reinitiation of transcription requires A. phosphorylation of.

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