The correct answer is: Prions are proteins that are folded incorrectly.
These misfolded proteins have abnormal 3D structure but the cause is not clearly known. They aggregate in tissue and cause it damage and cell death. Prion aggregates are stable, meaning that are resistant to denaturation by chemical and physical agents.
Prions cause neurodegenerative diseases such as Creutzfeldt–Jakob disease (fatal degenerative brain disorder) or Gerstmann–Sträussler–Scheinker syndrome (also fatal).
Answer: The pH dependence is usually due to the side groups of the amino acids. A change in pH changes the protonation pattern and can, in extreme cases, result in protein denaturation. I therefore suspect that your protein stabilizes the enzyme structure, thus keeping it active at sub optimal pH values.
Explanation: Hope this helps :)
1. The correct answer is: a. There are more mRNA bases than amino acids.
The transcription of monocistronic mRNA in prokaryotes is a rare process (it is more characteristic for the eukaryotes). Monocistronic mRNA is RNA, which encodes for only one or specific protein. Three bases of mRNA encode one amino acid of protein, thus it has more bases than amino acids of the final product, protein.
2. The correct statements are:
The mRNA contains 5' and 3' untranslated regions.
The stop codon does not code for an amino acid.
The start site of transcription is upstream of the start codon.
Each codon contains 3 RNA bases.
All of these approve that more bases are in mRNA since not all of them are translated into amin oacids.
Other statements are hallmarks of eukaryotic RNA processing, and therefore not relevant to prokaryotes.
Answer:
I am not sure but I think the answer is of last one.
