Answer:
The miRNAs act as post-transcriptional silencers, as they are similar to specific mRNAs and regulate their stability and translation. They are small endogenous non-coding ribonucleic acid (RNA) molecules, with about 22 nucleotides, which act as regulators of gene expression in plants and animals, at the post-transcriptional level through the cleavage of a target messenger RNA (mRNA) or repression of translation.
In general, most miRNA genes are transcribed by RNA polymerase II in the nucleus in primary miRNAs (pri-miRNAs). Individually, a pri-miRNA can produce a single miRNA or contain groups of two or more miRNAs that are processed from a common primary transcript. These long pri-miRNA are cleaved by a complex comprising the double-stranded RNAse III enzyme (DROSHA) and its essential cofactor, the binding protein DGCR8 (DiGeorge Syndrome Critical Region 8 protein) in mammals. DROSHA contains two domains of RNAse III, each of which cleaves a strand of the RNA resulting in the precursor microRNA (pre-miRNA) with about 70 base pairs, which contains a double-stranded stretch and a single-stranded loop, forming a structure in clamp. The pre-miRNA is exported to the cytoplasm by the protein exportin-5 (XPO-5), where it is cleaved by DICER1, an RNAse III that assesses the 3 'and 5' ends of the pre-miRNA, generating a mature miRNA with about 22 nucleotides. The processing of pre-miRNA by Dicer promotes the unfolding of the RNA duplex in the form of a clamp. The position in the formation of the clamp can also influence the choice of tape.
Explanation:
Oxygen is a small molecule and it's nonpolar, so it easily passes through a cell membrane. Carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. Small uncharged lipid molecules can pass through the lipid innards of the membrane.
3 codons code for 1 amino acid
so here you would multiply
127 x 3 = 381
So the answer is : 381
Amphibolite is a foliated metamorphic rock composed principally of ... What platy, parallel, mineral grains are the most visual aspect of foliated .
Answer:
Bromelain is a group of sulfhydryl containing proteases. Each of these proteases is composed of amino acids, the building blocks of protein.
Explanation:
Bromelain:
Bromelain is not regarded as a single enzyme. It is a mixture of proteolytic enzymes as well as phosphatases, glucosidases, peroxidases, cellulases and glycoproteins. At first, bromalain was regarded as an enzyme mixture produced by pineapple plants (<em>Ananas comosus</em>) but now it is referred to as any protease extracted from the Bromeliaceae family.
Proteins are macromolecules composed of amino acid subunits or monomers. Amino acids, linked through peptide bonds, form the complex globular structures of enzymes.
