Chapter 14

The expression of a given gene depends on ________. a. the type of organism b. environmental conditions c. the type of cell d. all of the above

Gene expression in multicelled eukaryotes changes in response to ________. a. external conditions b. operons c. master genes d. a and c

At________ in DNA, regulatory protein binding can increase transcription of specific genes. a. promoters b. enhancers c. operators d. both a and b

Eukaryotic gene controls govern ________. 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

Eukaryotic gene expression controls guide ________. a. natural selection b. nutrient availability c. development d. all of the above

Cell differentiation ________. a. occurs in all complex multicelled organisms b. requires unique genes in different cells c. involves selective gene expression d. both a and c e. all of the above

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

A cell with a Barr body is ________. a. prokaryotic b. from a male mammal c. from a female mammal d. infected by Barr virus

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

Knockout experiments________ genes. a. delete b. inactivate c. express d. either a or b

\(\mathrm{A}(\mathrm{n})\)________ is a promoter and a set of operators that control access to two or more prokaryotic genes. a. lactose molecule b, Operon c. dosage compensator d. both b and c

Match the terms with the most suitable description. ________ABC genes ________XIST gene ________operator ________Barr body ________process of cell differentiation ________methylation a. a big RNA is its product b. binding site for repressor c. cells become specialized in composition, function, etc. d. inactivated X chromosome e. guide flower development \(\mathrm{f}_{4}-\mathrm{CH}_{3}\) additions to DNA