The shape of a bacterial chromosome is typically: MCQ with Answer and Explanation

Explanation:
In the peripheral nervous system (PNS), Schwann cells wrap around axons to form the myelin sheath, which insulates axons and increases the speed of nerve impulse conduction (saltatory conduction). In the central nervous system (CNS), oligodendrocytes perform this function. Astrocytes support neurons, microglia act as immune cells. Nodes of Ranvier are gaps in the myelin sheath.

Explanation:
Cross: TT × Tt. Gametes: T (from TT) and T or t (from Tt). Offspring genotypes: TT and Tt. Both express the dominant phenotype because the recessive allele t is masked by T. No tt offspring are produced, so 0% show the recessive trait.

Explanation:
Certain high-risk strains of HPV are a major cause of cervical cancer. Vaccines are available. TB is bacterial, malaria protozoan, cholera bacterial.