1- microRNA regulate protein expression by: a) binding to the promoter region, a
ID: 92301 • Letter: 1
Question
1- microRNA regulate protein expression by:
a) binding to the promoter region, activating transcription
b) binding to the promoter region, repressing transcription
c) binding to mRNA, activating translation
d) binding to mRNA, repressing translation
e) bining to rRNA, repressing translation
2- Which finding would be the most plausible?
a) a pre-RNA strand is longer than the corresponding mature mRNA
b) a pre-RNA strand is shorter than the corresponding mature mRNA
c) The nucleotides of a pre-RNA strand are in a different order from those of the corresponding mature mRNA
d) a mature mRNA strand contrains more introns than the corresponding pre-RNA
e) intron scramble the order of genes
3- the dormant form of a bacterial cell is called a:
a) vegetative cell
b) biofilm
c) mutualism
d) spore
e) microbiome
Please explain, thank you!
Explanation / Answer
Answer:
1. (d) binding to mRNA, repressing translation
Explanation:
miRNAs are non coding RNAs that acts at the post-transcription level. The miRNAs gets matured to form the mature microRNA which gets incorporated into ribonuclear particle to form RISC (RNA Induced Silencing Complex). miRNAs act by targeting mRNAs and suppresses their protein synthesis.
2. (a) a pre-RNA strand is longer than the corresponding mature mRNA
Explanation:
The pre-RNA contains the non coding regions and the introns. The pre-RNA is edited (undergoes splicing) to remove the introns and the non coding regions and bring together the protein coding exons. Thus, the pre-RNA are longer than the corresponding mRNA.
3. (d) spore
Explanation:
The spores are the dormant, resting stages of bacteria. This stage are highly resistant and enables the bacteria to survive stress conditions (eg: dry conditions) which would otherwise kill its vegetative form.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.