Chapter 19 Bio – Flashcards
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the control of gene expression is more complex in eukaryotic cells because
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gene expression differentiates specialized cells
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histones are
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small, positively charged proteins that bind tightly to DNA
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heterochromatin
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is all of the above
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DNA methylation of cytosine residues
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may be a mechanism of exogenic inheritance when methylation patterns are repeated in daughter cells
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which of the following appears to be attached to the nuclear lamina in a precise and organized fashion
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looped domains of interphase chromosomes
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which of the following is not true of enhancers
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they are located within the promoter, and when complexed with a steroid or other small molecules, they release an inhibitory protein and thus make DNA more accessible to RNA polymerase
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which of the following is not an example of the control of gene expression that occurs after transcription
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rRNA genes amplified in tandem arrays
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pseudogenes are
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sequences of DNA that are similar to real genes but lack regulatory sequences necessary for gene expression
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which of the following might a proto-oncogen code for
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receptor proteins for growth factors
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a gene can develop into an oncogene when it
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does any of the above
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what is the main reason that prokaryotic genes average 1,000 nucleotide base pairs, whereas human gene average about 27,000 base pairs
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prokaryotes are much simpler organisms, humans have many types of differentiated cells
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a tumor suppressor gene could cause the onset of cancer if
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both a and d have happened
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what is apoptosis
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a cell suicide program that may be initiated by p53 protein in response to DNA damage
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which of the following would you expect to find as part of a receptor protein that binds wih a steroid hormoren
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a domain that binds to DNA and protein binding domains
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a eukaryotic gene typically has all of the following associated with it except
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an operator
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what are proteasomes
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enormous protein complexes that degrade unneeded protein in the cell
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which of the following would most likely account for a family history of colorectal cancer
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inheritance of one mutated AAPC allele that regulates cell adhesion and migration
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which of the following best describes what pseudogenes and introns have in common
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they are not expressed-they do not produce a functional product
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how is the coordinated transcription of genes involved in the same pathway regulated
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a steroid hormone selectively binds to the promoters for all the genes
