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CMB2001 Questions and Answer | Latest Update 2024/2025
CMB2001 Questions and Answer | Latest Update 2024/2025
[Show more]CMB2001 Questions and Answer | Latest Update 2024/2025
[Show more]Consensus sequences are described with IUPAC ambiguous nucleotide 
codes. 
W is A or T 
S is G or C 
R is G or A 
Y is T or C 
What is the span of the core/basal region of the eukaryotic promoter? 
 ~~> -30 to +30nt 
What elements are in the core region of the eukaryotic promoter? 
 ~~> TATA ...
Preview 2 out of 6 pages
Add to cartConsensus sequences are described with IUPAC ambiguous nucleotide 
codes. 
W is A or T 
S is G or C 
R is G or A 
Y is T or C 
What is the span of the core/basal region of the eukaryotic promoter? 
 ~~> -30 to +30nt 
What elements are in the core region of the eukaryotic promoter? 
 ~~> TATA ...
Describe how H3Lys9me heterochromatin is formed 
 ~~> H3Lys9me heterochromatin formation: Lys9 deacetylated by 
HDAC. Suvar39 then methylates lys9. Methylated lys9 is recognised by 
HP1 and then HP1 binds. HP1 has chromodomain - chromodomains 
often recognise and bind to methylated lys residue...
Preview 4 out of 68 pages
Add to cartDescribe how H3Lys9me heterochromatin is formed 
 ~~> H3Lys9me heterochromatin formation: Lys9 deacetylated by 
HDAC. Suvar39 then methylates lys9. Methylated lys9 is recognised by 
HP1 and then HP1 binds. HP1 has chromodomain - chromodomains 
often recognise and bind to methylated lys residue...
What is gene expression? 
 ~~> dsDNA is decoded to ssRNA/proteins by an mRNA intermediate 
using A/U/C/GTPs and RNA polymerase 
Where is the consensus sequence in prokaryotic promoters? 
 ~~> at -10 and -35 upstream of the the transcription start site 
What recognises the consensus sequences ...
Preview 4 out of 67 pages
Add to cartWhat is gene expression? 
 ~~> dsDNA is decoded to ssRNA/proteins by an mRNA intermediate 
using A/U/C/GTPs and RNA polymerase 
Where is the consensus sequence in prokaryotic promoters? 
 ~~> at -10 and -35 upstream of the the transcription start site 
What recognises the consensus sequences ...
Core Promoter Elements 
 ~~> TATA box = repetitive sequence of thymine and adenine 
 Initiator (INR) = sequence of pyramidines like thymine and cytosine 
 DPE = downstream promoter elements found along the DNA 
Common to have >1 promoter but not all of them 
CpG islands 
 ~~> Sequences high...
Preview 4 out of 51 pages
Add to cartCore Promoter Elements 
 ~~> TATA box = repetitive sequence of thymine and adenine 
 Initiator (INR) = sequence of pyramidines like thymine and cytosine 
 DPE = downstream promoter elements found along the DNA 
Common to have >1 promoter but not all of them 
CpG islands 
 ~~> Sequences high...
Why does RNA degradation take place? 
 ~~> Damaged mRNA 
 Incorrectly transcribed/processed mRNA 
 
 Control gene expression 
What 2 things control mRNA levels? 
 ~~> Transcription and turnover 
Why is turnover important? 
 ~~> If mRNA has a ridiculously long half life and doesn't go away,...
Preview 3 out of 28 pages
Add to cartWhy does RNA degradation take place? 
 ~~> Damaged mRNA 
 Incorrectly transcribed/processed mRNA 
 
 Control gene expression 
What 2 things control mRNA levels? 
 ~~> Transcription and turnover 
Why is turnover important? 
 ~~> If mRNA has a ridiculously long half life and doesn't go away,...
Eukaryotic promoters have a basal region which can contain a TATA box, 
initiator (Lnr), BRE (TFIIV recognition element) and what other element? 
 ~~> Downstream core promoter (DPE) 
In prokaryotes RNA polymerase requires what co-factor? 
 ~~> 70 sigma factor 
Forms the holoenzyme 
The promo...
Preview 4 out of 33 pages
Add to cartEukaryotic promoters have a basal region which can contain a TATA box, 
initiator (Lnr), BRE (TFIIV recognition element) and what other element? 
 ~~> Downstream core promoter (DPE) 
In prokaryotes RNA polymerase requires what co-factor? 
 ~~> 70 sigma factor 
Forms the holoenzyme 
The promo...
Consensus sequences are described with IUPAC ambiguous nucleotide 
codes. 
What is a promoter? 
 ~~> DNA sequence which RNA polymerase can bind to and 
transcribe the protein 
Prokaryotic promoters 
 ~~> TATAAT -(10 region) 'Pribnow box' 
TTGACA - (-35 region) 
- two consensus sequences 
P...
Preview 2 out of 12 pages
Add to cartConsensus sequences are described with IUPAC ambiguous nucleotide 
codes. 
What is a promoter? 
 ~~> DNA sequence which RNA polymerase can bind to and 
transcribe the protein 
Prokaryotic promoters 
 ~~> TATAAT -(10 region) 'Pribnow box' 
TTGACA - (-35 region) 
- two consensus sequences 
P...
how many proteins are in small subunit of the 70S ribosome 
 ~~> 21 
how many proteins are in small subunit of the 80S ribosome 
 ~~> 33 
how many proteins are in large subunit of the 70S ribosome 
 ~~> 31 
how many proteins are in large subunit of the 80S ribosome 
 ~~> 50 
23S and 5S r...
Preview 2 out of 15 pages
Add to carthow many proteins are in small subunit of the 70S ribosome 
 ~~> 21 
how many proteins are in small subunit of the 80S ribosome 
 ~~> 33 
how many proteins are in large subunit of the 70S ribosome 
 ~~> 31 
how many proteins are in large subunit of the 80S ribosome 
 ~~> 50 
23S and 5S r...
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