The 'powerhouse of the cell' is the: MCQ with Answer and Explanation

Explanation:
Transformation is the direct uptake and incorporation of naked DNA from the surroundings by a bacterium. Conjugation is DNA transfer via pilus, transduction via phage, lysogeny is phage DNA integration.

Explanation:
Viruses are unique entities containing either DNA or RNA, never both simultaneously, enclosed in a protein capsid. They are obligate intracellular parasites, requiring a host cell's machinery to replicate. Despite being biological entities, they can be crystallized like chemicals, as demonstrated by W.M. Stanley with TMV. Thus, statements 2 and 3 are correct.

Explanation:
Vitamin E (tocopherol) is a fat-soluble antioxidant that protects cell membranes from lipid peroxidation. Vitamin C is water-soluble antioxidant, A is for vision, D for calcium.