Chapter 10

The expression of a gene may depend on _______. a. the type of organism b. environmental conditions c. the type of cell d. all of the above

Gene expression in multicelled eukaryotic organisms changes in response to _______. a. extracellular conditions b. master gene products c. operons d. a and b

Proteins that influence RNA synthesis by binding directly to DNA are called ________. a. promoters b. transcription factors c. operators d. enhancers

In eukaryotes, control over gene expression occurs at the level of ______. a. transcription b. RNA processing c. RNA transport d. mRNA degradation e. translation f. protein modification g. a through e h. all of the above

Muscle cells differ from bone cells because _______. a. they carry different genes b. they use different genes c. both a and b

Control over gene expression drives ______ in complex, multicelled eukaryotes. a. transcription factors b. nutrient availability c. development d. all of the above

Homeotic gene products ________. a. flank a bacterial operon b. map out the overall body plan in embryos c. control the formation of specific body parts

A gene that is knocked out is ________ a. deleted b. inactivated c. expressed d. either a or b

Which of the following includes all of the others? a. homeotic genes b. master genes c. SRY gene d. \(P A X 6\)

During \(X\) chromosome inactivation, _________. a. female cells shut down b. RNA coats a chromosome c. pigments form d. both a and b

A cell with a Barr body is ______ a. a bacterium b. a sex cell c. from a female mammal d. infected by the Barr virus

Operons ________. a. only occur in bacteria b. have multiple genes c. involve selective gene expression

Match the terms with the most suitable description. _______ SRY gene _______ operator _______ Barr body _______ differentiation _______ mRNA zip code _______ methylation _______ eyeless _______ homeodomain ________ operon a. makes a man out of you b. binding site for repressor c. may be epigenetic d. inactivated X chromosome e. controls multiple genes f. localization mechanism g. works by binding DNA h. required for eye formation i. driven by gene expression control