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MCB Exam 2 - RATs (5-9) Questions with 100% Correct Answers
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MCB Exam 2 - RATs (5-9) Questions with 100% Correct Answers in euk cells the factors that are involved in the most mRNAs are known as - general transcription factors the first phosphorylation event affecting the CTD of the large subunit of ___ is mediated by a kinase activity assoc. to ___ - R...

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  • October 22, 2024
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  • 2024/2025
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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.

MCB Exam 2 - RATs (5-9) Questions with

100% Correct Answers


in euk cells the factors that are involved in the most mRNAs are known as -

✔✔general transcription factors

the first phosphorylation event affecting the CTD of the large subunit of ___

is mediated by a kinase activity assoc. to ___ - ✔✔RNA pol II; TFIIH

in euk cells the RNA pol that transcribes messenger RNA is ___ - ✔✔RNA

pol II

one striking diff at the level in which transcription is initiated btw prok and

euk is that - ✔✔in prok all factors required to start transcription are

associated to the holo-enzyme, whereas in euk additional protein factors

besides the RNA pol are needed to initiate transcription

the TFII factor that bridges the interaction btw TFIID to the promoter and

positioning it in place to initiate transcription is ___ - ✔✔TFIIB

The TFII factor that contains among its subunits two proteins known as

XPD and XPB each endowed with helicase activity is ___ - ✔✔TFIIH

, ©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.

the helicase activity that allows transcription by RNA pol II to start is

mediated by - ✔✔TFIIH

evolutionarily speaking the existence in euk of three diff polymerases is

most likely the result of - ✔✔a selective pressure to ensure high expression

of a specific set of genes while allowing tight control of others

phosphorylation of the CTD is a key regulatory event during transcriptional

initiation by RNA pol I - ✔✔False

in euk cells transcription of the genes coding for the large ribosomal RNAs

yields a large 45S pre-rRNA that is later on processed to produce the 18S,

5.8S, and 5S rRNAs - ✔✔false

histone deacetylases could be argued to typically ___ gene expression -

✔✔decrease

the essential sequence that drives the recruitment of general transcription

factors thus allowing transcription to occur is known as the - ✔✔Core

promoter (?)

these are sequences that divide chromosomes into independent domains

and prevent enhancers form acting on promoters located on a different

domain - ✔✔insulators

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