The enzyme that unwinds the DNA double helix during replication is: MCQ with Answer and Explanation

Explanation:
Mature mammalian red blood cells (erythrocytes) lose their nucleus and other organelles during development to maximize space for hemoglobin. Thus they are anucleate. They cannot divide or repair themselves and have a lifespan of about 120 days. Neurons, leukocytes, and hepatocytes are nucleated. RBCs obtain energy through anaerobic glycolysis.

Explanation:
Cellulose, a linear polymer of β-D-glucose units linked by β-1,4-glycosidic bonds, forms microfibrils that provide tensile strength to plant cell walls. Glycogen is animal storage, starch plant storage, chitin in fungi and arthropods. Cellulose is the most abundant organic polymer on Earth.

Explanation:
Angiogenesis is the growth of new blood vessels from pre-existing ones, important in development, wound healing, and tumor growth. Vasodilation is widening, vasoconstriction narrowing of vessels. Hematopoiesis is blood cell formation. Inhibiting angiogenesis is a cancer therapy strategy.