The condition in which the lens of the eye becomes cloudy, impairing vision, is: MCQ with Answer and Explanation

Explanation:
Molecular cloning involves inserting a DNA fragment into a vector (e.g., plasmid), which is then taken up by host cells (e.g., E. coli). As the bacteria replicate, they produce many copies of the inserted DNA, creating a gene library. PCR amplifies without vectors, sequencing reads bases, microarrays analyze expression.

Explanation:
The glomerulus is a knot of capillaries enveloped by Bowman's capsule, where blood is filtered under pressure (ultrafiltration). The high hydrostatic pressure forces water, ions, glucose, and urea into the tubular system, while cells and large proteins are retained. The loop of Henle, distal tubule, and collecting duct process the filtrate.

Explanation:
Active transport uses energy (usually ATP) to pump molecules or ions across a membrane against their electrochemical gradient, e.g., Na⁺/K⁺ pump. Diffusion, osmosis, and facilitated diffusion are passive processes that move substances down their gradient without energy expenditure.