In recombinant DNA technology, restriction enzymes are used to: MCQ with Answer and Explanation

Explanation:
The poly-A tail is a long chain of adenine nucleotides (typically 100-250) added to the 3' end of a pre-mRNA molecule during post-transcriptional processing in the nucleus. Its primary functions are to protect the mRNA molecule from enzymatic degradation in the cytoplasm (by exonucleases), to facilitate the export of the mature mRNA from the nucleus to the cytoplasm, and to promote translation by helping to recruit ribosomes. It also plays a role in determining the lifespan of the mRNA in the cytoplasm.

Explanation:
Growth Hormone (GH), or somatotropin, is a peptide hormone secreted by the somatotroph cells of the anterior pituitary gland. Its primary effects are to stimulate growth, cell reproduction, and cell regeneration, particularly in bones (stimulating the epiphyseal plates) and skeletal muscle. It also has significant metabolic effects: it increases protein synthesis (anabolic), promotes the breakdown of fats (lipolysis) to use as energy, and raises blood glucose levels (diabetogenic effect) by reducing glucose uptake by cells. Its effects are largely mediated by Insulin-like Growth Factors (IGFs), primarily produced by the liver.

Explanation:
The primary cell wall of plants consists of cellulose microfibrils embedded in a matrix of hemicellulose and pectin. Secondary walls may contain lignin.