Consider the following statements about enzymes: 1. Enzyme activity is affected by pH. 2. All enzymes have an optimum temperature around 37°C. 3. Enzymes are reusable. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
Creutzfeldt-Jakob disease (CJD) is a rare, fatal brain disorder caused by misfolded prion proteins (PrP^Sc), which are infectious protein particles lacking nucleic acid. Rabies, polio, and influenza are caused by viruses. Prions cause spongiform encephalopathies like mad cow disease (BSE).

Explanation:
DNA polymerase catalyzes the formation of phosphodiester bonds between adjacent nucleotides, extending the new strand complementary to the template. Helicase unwinds DNA, ligase joins fragments, primase synthesizes RNA primer. In prokaryotes, DNA polymerase III is the main replicative enzyme.

Explanation:
Dermal tissue (epidermis in primary growth, periderm in secondary growth) forms the outermost protective layer of leaves, stems, and roots. It includes specialized cells like guard cells and root hairs. Vascular tissue (xylem, phloem) conducts, ground tissue fills and stores, meristematic is for growth.