The enzyme that breaks down starch into maltose in the mouth is: MCQ with Answer and Explanation

Explanation:
Fungal cell walls contain chitin, a polymer of N-acetylglucosamine, which also forms the exoskeleton of arthropods. Plant cell walls are primarily cellulose, bacterial cell walls contain peptidoglycan (except Mycoplasma). Hemicellulose is a component of plant cell walls along with cellulose. Chitin provides structural strength and rigidity to fungi.

Explanation:
Protista consists of unicellular eukaryotes like protozoans, unicellular algae, and slime molds. Monera includes prokaryotes, Fungi are mostly multicellular eukaryotes (except yeast), Plantae are multicellular autotrophs.

Explanation:
While the Blood-Brain Barrier (BBB) protects most of the brain, there are specific areas where the BBB is absent or highly permeable. These are the circumventricular organs (CVOs), which are located around the third and fourth ventricles. Because they lack a typical BBB, they can directly sample the chemical composition of the blood and cerebrospinal fluid. This is essential for their functions, which include neuroendocrine regulation (e.g., the area postrema for vomiting, the organum vasculosum of the lamina terminalis for osmoregulation, and the median eminence for hormone release).