Which of the following statements about DNA is correct? MCQ with Answer and Explanation

Explanation:
The pancreas, liver, and salivary glands are accessory digestive glands that secrete enzymes or substances aiding digestion into the alimentary canal. The pancreas produces pancreatic juice (enzymes and bicarbonate) released into the duodenum. The stomach and small intestine are part of the main digestive tract, and the esophagus is a conduit for food.

Explanation:
The question describes sieve elements, which are the conducting cells of the phloem, not xylem. Sieve tube elements are living but lack a nucleus at maturity and have perforated end walls called sieve plates. Xylem vessels and tracheids are dead, hollow, and lack perforated end walls (vessels have perforation plates, but they are not called sieve plates). Xylem parenchyma is living.

Explanation:
The Smooth Endoplasmic Reticulum (SER) in liver hepatocytes contains enzymes like cytochrome P450 that detoxify lipid-soluble drugs, metabolic waste, and toxins by making them water-soluble for excretion. Rough ER is involved in protein synthesis, the Golgi apparatus in packaging and secretion, and lysosomes in intracellular digestion. Exam tip: SER is abundant in liver and adrenal cortex cells.