Bio 20A, Quiz 8

Front 1

Research on E. coli indicates that

Back 1

glucose is the preferred energy source.

Front 2

In the _______ of lactose, the lac _______ binds to the lac _______

Back 2

absence; repressor; operator

Front 3

In E. coli, when the concentration of glucose is high, the concentration of _______ is
low.

Back 3

cAMP

Front 4

The CRP–cAMP complex binds _______ of the lac operon.

Back 4

close to the RNA polymerase binding site

Front 5

Around _______ base pairs of DNA contact each core particle in a _______.

Back 5

146; nucleosome

Front 6

A pattern of acetylation of lysines on the amino terminal tails of histones in a region of
a chromosome

Back 6

can be inherited by daughter cells; can be reversible; allows for regulation of gene expression; is an example of an epigenetic phenomenon.

Front 7

A DNA sequence, which can be up to 100,000 base pairs distant from the gene,
stimulates transcription when bound by a protein. This sequence is called a(n)

Back 7

enhancer.

Front 8

Gene expression can be regulated

Back 8

before transcription; after transcription and before translation; during translation; after translation.

Front 9

Alternative splicing of pre-mRNA in human genes

Back 9

is common - the majority of genes undergo alternative splicing; allows certain tissues to make specific isoforms of a protein from a single gene; allows for some exons to be completely skipped in one alternative isoform and
included in another

Front 10

A stem cell generated from an adult human cell is called a(n) ___________ and
requires inducing the expression of 4 specific ____________.

Back 10

induced pluripotent stem cell; transcription factors

Front 11

microRNAs

Back 11

can have base-pairing interactions with their target's 3' UTR

Front 12

Ubiquitination is a process that leads to

Back 12

anges in protein stability