The condition where the pleural cavity fills with air, causing lung collapse, is: MCQ with Answer and Explanation

Explanation:
Holstein-Friesian (often just called Holstein) is a high-yielding exotic breed of dairy cattle originating from the Netherlands. They are known for their high milk production, although the milk has a lower fat content compared to some indigenous breeds. Sahiwal, Gir, and Red Sindhi are important indigenous (Indian) cattle breeds known for their disease resistance and heat tolerance.

Explanation:
Matthew Meselson and Franklin Stahl, in 1958, used density gradient centrifugation of E. coli grown in N¹⁵ medium to prove that DNA replication is semi-conservative: each new DNA molecule consists of one old and one new strand. Watson and Crick proposed the double helix, Hershey-Chase confirmed DNA as genetic material, Chargaff formulated base pair rules.

Explanation:
Osmosis is the net diffusion of water across a selectively permeable membrane from a region of high water potential (low solute) to low water potential (high solute). Diffusion refers to solute movement, active transport uses energy, plasmolysis is cell shrinkage.