Consider statements about cell division: 1. Crossing over occurs in prophase I of meiosis. 2. Anaphase I involves the separation of homologous chromosomes. 3. Telophase II results in four diploid cells. Which are correct? MCQ with Answer and Explanation

Explanation:
Meselson and Stahl proved that after replication, each daughter DNA contains one parental and one newly synthesized strand. R exactly explains semiconservative.

Explanation:
The conversion of milk to curd (yogurt) is a fermentation process primarily caused by lactic acid bacteria (LAB), such as Lactobacillus. These bacteria ferment the lactose (milk sugar) into lactic acid. The lactic acid lowers the pH, causing the milk protein (casein) to coagulate and solidify, forming curd. It also improves the nutritional value by producing Vitamin B12.

Explanation:
Stanley Miller and Harold Urey (1953) simulated primitive Earth conditions by mixing methane, ammonia, hydrogen, and water vapor and providing electric discharge (simulating lightning). They obtained amino acids (glycine, alanine, etc.), supporting the chemical origin of life hypothesis. It didn't produce proteins, DNA, or lipids directly. This experiment was crucial for abiogenesis theories.