Chapter 10

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

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

Binding of in DNA can increase the rate of transcription of specific genes. a. activators; repressors c. repressors; operators b. activators; enhancers d. both a and \(b\)

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

Eukaryotic gene control governs a. transcription c. translation b. RNA processing f. protein modification c. RNA transport \(\mathrm{g}\). a through e d. mRNA degradation 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 eukaryotic gene expression guides _________ a. natural selection c. development b. nutrient availability 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 c. expressed b. inactivated d. either a or b

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 c. from a female mammal b. a sex cell 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. __________knockout a. makes a man out of you _________SRY gene b. binding site for repressor __________operator c. requires gene expression control __________Barr body d. may have epigenetic effects ___________differentiation \(\quad\) c. inactivated \(X\) chromosome ____________methylation \(\quad\) f. gene deleted