The neurotransmitter that is deficient in Parkinson's disease is: MCQ with Answer and Explanation

Explanation:
In 1977, Keiichi Itakura and his colleagues at the City of Hope National Medical Center, in collaboration with Herbert Boyer's lab, successfully synthesized the gene for somatostatin (a hypothalamic hormone) and inserted it into E. coli. The bacteria then produced the somatostatin protein. This was a landmark achievement, as it was the first time a synthetic human gene was expressed in a bacterium to produce a functional human hormone, paving the way for the commercial production of insulin and other therapeutics.

Explanation:
The liver plays a crucial role in carbohydrate metabolism, storing excess glucose as glycogen and releasing it when blood sugar drops. The spleen acts as a blood filter, removing old, damaged, or abnormal red blood cells and storing platelets. The appendix is a small, blind-ended tube attached to the cecum; it has no significant role in human digestion and is considered a vestigial organ. Thus, statements 1 and 2 are correct.

Explanation:
Genetic variation provides the raw material for natural selection. If all individuals were identical, selection could not favor any. R correctly explains A.