Chapter 10 - Controls Over Genes Flashcards
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
d. all of the above
Gene expression of multi-celled eukaryotic cells changes in response to _____________.
a. conditions outside the cell
b. master gene products
c. operons
d. a and b
d. a and b
Binding of _______ to _______ in DNA can increase the rate of transcription of specific genes.
a. activators; promoters
b. activators; enhancers
c. repressors; operators
d. both a and b
d. both a and b
Proteins that influence gene expression by binding to DNA are called _______________.
transcription factors
Polytene chromosomes form in some types of cells that ___________.
a. have a lot of chromosomes
b. are making a lot of protein
c. are differentiating
d. b and c are correct
b. are making a lot of protein
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
h. all of the above
The expression of ABC genes __________.
a. occurs in layers
b. controls flower formation
c. causes mutations in flowers
d. both a and b
d. both a and b
Cell differentiation ______________.
a. occurs in all complex multi-celled organisms
b. requires unique genes in different cells
c. Involves selective gene expression
d. both a and c
e. all of the above
d. both a and c
During X chromosome inactivation
______________.
a. female cells shut down
b. RNA coats chromosomes
c. pigments form
d. both a and b
b. RNA coats chromosomes
A cell with a Barr body is ____________.
a. a bacterium
b. a sex cell
c. from a female mammal
d. infected by Barr virus
c. from a female mammal
Homeotic gene products _______.
a. flank a bacterial operon
b. map out the overall body plan in embryos
c. control the formation of certain body parts
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
d. either a or b
A promoter and a set of operators that control access to two or more genes is a(n) _______________.
a. lactose molecule
b. operon
c. dosage compensator
d. knockout
b. operon
Match the term with the most suitable description.
\_\_\_ ABC genes \_\_\_XIST gene \_\_\_ operator \_\_\_ Barr body \_\_\_ differentiation \_\_\_ methylation
a. a big RNA is its product
b. binding site for repressor
c. cells become specialized
d. —CH3 additions to DNA
e. inactivated X chromosome
f. guide flower development
Match the term with the most suitable description.
(f) ABC genes
(a) XIST gene
(b) operator
(e) Barr body
(c) differentiation
(d) methylation
a. a big RNA is its product
b. binding site for repressor
c. cells become specialized
d. —CH3 additions to DNA
e. inactivated X chromosome
f. guide flower development
