Which of the following is a correct match of scientist and contribution? MCQ with Answer and Explanation

Explanation:
Plasmids have an origin of replication, making them effective cloning vectors. Restriction enzymes cut DNA, tissue culture produces clones, Bt cotton targets specific insects.

Explanation:
The placenta is a temporary organ formed by both fetal (chorion) and maternal (endometrium) tissues. It facilitates the exchange of oxygen, nutrients, and waste products between mother and fetus, and produces hormones (e.g., hCG, progesterone). The umbilical cord connects the fetus to the placenta. The amnion surrounds the embryo.

Explanation:
The nomenclature for restriction enzymes is based on the genus, species, strain, and order of discovery of the source bacterium. In EcoRI: 'E' stands for the genus Escherichia, 'co' stands for the species coli, 'R' stands for the strain RY13, and 'I' indicates that it was the first restriction enzyme isolated from this particular strain. This systematic naming convention helps scientists identify the exact source of the enzyme.