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:
Lysosomes are membrane-bound vesicles containing hydrolytic enzymes formed by the Golgi apparatus. The Golgi modifies, sorts, and packages proteins from the rough ER into vesicles; some become lysosomes. These organelles function in intracellular digestion and autophagy. Rough ER synthesizes enzymes, but the final packaging into lysosomes occurs at the Golgi. Hence, Golgi is sometimes called the 'traffic police' of the cell.

Explanation:
Pantothenic acid (vitamin B₅) is a component of coenzyme A (CoA), which is essential for the metabolism of carbohydrates, fats, and proteins via the Krebs cycle and fatty acid synthesis. Thiamine is TPP, biotin for carboxylation, folic acid for one-carbon transfer.

Explanation:
Pteridophytes (ferns and their relatives) are the first terrestrial plants to possess vascular tissues (xylem and phloem) for water and nutrient transport. However, they do not produce seeds or flowers and reproduce via spores. Hence, they are called 'vascular cryptogams'. Bryophytes are called 'amphibians of the plant kingdom'.