Gene transcriptions/Elements/GAACs/Quiz

GAAC elements is a lecture as part of the gene transcription series.

This micrograph stained with chlorazol black, reveals an Entamoeba histolytica cyst. Credit: CDC/ Dr. George Healy.

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Quiz edit


1 The portion of a promoter in which a GAAC element is likely to be found is which of the following?

dispersed promoter
proximal promoter
downstream promoter
distal promoter
focused promoter
core promoter

2 Several promoter elements have been previously identified in eukaryotes, but those cannot account for transcription from most RNA polymerase II-transcribed

3 True or False, Some GAAC elements are located in the dispersed promoter.


4 Which of the following is not a transcriptional characteristic of GAAC elements?

located between nucleotides -8 and +2 relative to the transcriptional start site (+1)
in eukaryotes
TATA-less genes
a consensus sequence

5 Complete the text:

The GAAC element is able to

a new


2-7 bases downstream of

, independent of TATA and Inr regions.

6 Complete the text:

Match up the type of promoter or promoter element with each of the possibilities below:
TATA box - A
initiator element - B
enhancers and inhibitors - C
downstream elements - D
General transcription factor II D - E
ATA box - F
downstream core promoter

includes the transcription start site

proximal promoter

distal promoter

core promoter

usually 25 nucleotides upstream


7 Which of the following are phenomena associated with GAAC elements?

transcription of A1BG
directs activator-dependent but TFIID-independent transcription
TATA box-less promoters
initiator element
mediator dependence
core promoter

8 True or False, GAAC elements are found in the promoter regions of at least 1% of human genes.


9 Yes or No, There are no GAAC elements on the human DNA template (negative) strand in the negative direction from ZSCAN22 to A1BG.


10 Yes or No, There are no inverse GAAC elements on the human DNA template (negative) strand in the positive direction from ZNF497 to A1BG.


Hypotheses edit

  1. A1BG is not transcribed by a GAAC element.

See also edit

External links edit

{{Anthropology resources}}

{{Medicine resources}}{{Phosphate biochemistry}}