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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