The structure of DNA was discovered by: MCQ with Answer and Explanation

Explanation:
Electroporation creates transient pores in the cell membrane using an electric field, allowing DNA to enter. Microinjection uses a fine needle, biolistics a gene gun, lipofection lipid vesicles.

Explanation:
Neurulation involves the folding of the neural plate to form the neural tube, which becomes the brain and spinal cord. Gastrulation forms germ layers.

Explanation:
Mammals are distinguished by the presence of mammary glands in females that secrete milk for nourishing young. They are warm-blooded, have hair/fur, and most give birth to live young (viviparous), though monotremes like platypus lay eggs. Feathers are characteristic of birds. Cold-blooded refers to ectotherms (reptiles, amphibians, fish). Mammals are endotherms.