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Regulation of Gene expression Chapter 12 set 1

front 1

Bread mold can grow in a minimal medium without supplements (wild type) while certain mutated strains (mutants) can only grow in a minimal medium that is supplemented with specific intermediates found in the following metabolic pathway for arginine synthesis:
minimal ------> ornithine -------> citrulline ------> arginine, where enzyme 1 converts the precursor to ornithine, enzyme 2 converts ornithine to citrulline, and enzyme 3 converts citrulline to arginine.
A strain that can grow in a minimal medium containing arginine, but NOT in a minimal medium containing citrulline or ornithine would have a mutation in the gene that encodes for

back 1

enzyme 3.

front 2

Bread mold can grow in a minimal medium without supplements (wild type) while certain mutated strains (mutants) can only grow in a minimal medium that is supplemented with specific intermediates found in the following metabolic pathway for arginine synthesis:
minimal ------> ornithine -------> citrulline ------> arginine, where enzyme 1 converts the precursor to ornithine, enzyme 2 converts ornithine to citrulline, and enzyme 3 converts citrulline to arginine.
Which of the following would be true of a strain that can grow in minimal medium containing ornithine, citrulline, or arginine, but not in minimal medium alone?

back 2

The strain would have a mutation in the gene that encodes enzyme 1.

front 3

The process that produces mRNA from DNA is called

back 3

transcription.

front 4

The processes of transcription and translation are collectively known as

back 4

gene expression.

front 5

________ is directly produced from the transcription of a eukaryotic gene.

back 5

pre-mRNA

front 6

________ is to transcription as ________ are to translation?

back 6

RNA polymerase; ribosomes

front 7

A(n) ______ is an organized unit of DNA sequences that enables a segment of DNA to be transcribed into RNA and ultimately results in the formation of a functional product.

back 7

gene

front 8

Which of the following are products of nonstructural genes, and are therefore never translated?

back 8

transfer RNA and ribosomal RNA

front 9

Transcription begins near a site in the DNA called the ______, while the terminator specifies the end of transcription.

back 9

promoter

front 10

Which of the following regions of a structural gene contains the information that specifies an amino acid sequence?

back 10

transcribed region

front 11

Which of the following statements about RNA polymerase in bacteria is INCORRECT?

back 11

It catalyzes the addition of nucleotides to the 5end of a growing RNA strand.

front 12

If a DNA template strand has a sequence of 3 TACAATGTAGCC 5, then the RNA produced from it will be which sequence?

back 12

5'AUGUUACAUCGG3'

front 13

Which of the following basic features of transcription is NOT shared by both prokaryotes and eukaryotes?

back 13

The complexity of protein components involved in transcription is similar for both prokaryotes and eukaryotes.

front 14

Which of the following proteins is involved in synthesizing messenger RNA in eukaryotes?

back 14

RNA polymerase II

front 15

Which protein influences the ability of RNA polymerase to transcribe genes?

back 15

transcription factors

front 16

Intervening sequences that are transcribed, but not translated into protein are called

back 16

introns.

front 17

Which of the following would occur if a cell's splicesomes were mutated so they no longer functioned normally?

back 17

Introns would remain in the mature mRNA

front 18

Which of the following statements about RNA processing in eukaryotes is INCORRECT?

back 18

Introns are simply excised out of pre-mRNA to produce the mature mRNA

front 19

________ enables a single gene to encode two or more polypeptides that are different in their amino acid sequence.

back 19

Alternative splicing

front 20

Which of the following molecule(s) exhibits self-splicing?

back 20

rRNA and tRNA