Which type of plastid stores starch? MCQ with Answer and Explanation

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.

Explanation:
Klinefelter syndrome is a sex chromosomal aneuploidy in males characterized by the karyotype 47, XXY. Individuals are phenotypically male but often exhibit feminine characteristics such as gynecomastia (development of breasts), sparse body hair, and are typically sterile due to underdeveloped testes. Down syndrome is trisomy 21 (47, +21), Turner syndrome is 45, X0, and Patau syndrome is trisomy 13.

Explanation:
The mucosal lining of the small intestine forms numerous finger-like projections called villi, which vastly increase the surface area for absorption of nutrients. Each villus contains a network of capillaries and a central lymphatic vessel (lacteal) for absorbing amino acids, sugars, and fats, respectively. Microvilli are further projections on the epithelial cells of the villi.