Consider statements about human digestion: 1. Pepsin digests proteins in the stomach. 2. Trypsin is secreted by the liver. 3. Lipase emulsifies fats. Which are correct? MCQ with Answer and Explanation

Explanation:
A peptide bond is a covalent bond formed between the carboxyl group (-COOH) of one amino acid and the amino group (-NH₂) of another, releasing a water molecule (condensation reaction). Glycosidic bonds link monosaccharides, phosphodiester bonds link nucleotides in DNA/RNA, hydrogen bonds stabilize secondary structures. Peptide bonds create the polypeptide backbone.

Explanation:
Folate (vitamin B₉) is crucial for DNA synthesis and cell division. Inadequate folate early in pregnancy can cause neural tube defects like spina bifida in the fetus. Supplementation is recommended.

Explanation:
Mature plant cells contain a large central vacuole that stores water, ions, pigments, and waste products, and is critical for maintaining turgor pressure against the cell wall, providing structural support. The vacuole can occupy up to 90% of cell volume. The reason correctly explains the function of the vacuole, so both statements are true and linked.