The '9+2' arrangement of microtubules is characteristic of: MCQ with Answer and Explanation

Explanation:
Graves' disease is an autoimmune hyperthyroidism characterized by exophthalmos (bulging eyes), weight loss, and tachycardia. Myxedema is adult hypothyroidism, cretinism congenital hypothyroidism, simple goiter iodine deficiency.

Explanation:
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain constant (in equilibrium) from generation to generation in the absence of evolutionary influences. The conditions required for this equilibrium are: no mutation, random mating, no gene flow (migration), very large population size (no genetic drift), and no natural selection. Therefore, random mating is a condition that MAINTAINS the equilibrium, not a factor that disrupts it. Non-random mating would disrupt it.

Explanation:
Neisseria meningitidis (meningococcus) causes bacterial meningitis, an inflammation of the meninges. N. gonorrhoeae causes gonorrhea. Pneumonia is often Streptococcus pneumoniae.