The botanical name of neem is: MCQ with Answer and Explanation

Explanation:
Melanin pigment in the iris determines eye color. High melanin: brown; low melanin: blue/green. Hemoglobin is in blood, carotene in plants, rhodopsin in retina.

Explanation:
Amphioxus (Branchiostoma) is a cephalochordate that retains the notochord, dorsal nerve cord, and pharyngeal slits throughout its life. In vertebrates, the notochord is largely replaced by the vertebral column during development. Amphioxus is a key model for studying vertebrate origins.

Explanation:
Restriction endonucleases act as molecular scissors, cleaving DNA at specific palindromic recognition sequences. Polymerase Chain Reaction (PCR) is a technique used to amplify specific DNA segments exponentially. Gel electrophoresis is primarily used to separate DNA or RNA fragments based on size, though it can separate proteins (SDS-PAGE), the statement implies it's exclusively or primarily for proteins in general biotech context, but 1 and 2 are definitively core facts. Let's refine: Gel electrophoresis separates charged molecules; for DNA it's by size. Statements 1 and 2 are universally correct core principles.