The scientist who discovered the bacterium that causes anthrax was: MCQ with Answer and Explanation

Explanation:
In prometaphase, the nuclear envelope breaks down, and spindle microtubules attach to kinetochores at the centromeres of chromosomes. This is a crucial step before alignment. In prophase, chromosomes condense; metaphase aligns them at the equator; anaphase separates chromatids. Prometaphase follows prophase in many descriptions.

Explanation:
The fluid mosaic model, proposed by Singer and Nicolson in 1972, accurately describes the plasma membrane. The phospholipid bilayer has a fluid consistency, allowing lateral movement of lipids and proteins. Proteins float within or on this bilayer, forming a mosaic pattern. Thus, the reason correctly explains the assertion.

Explanation:
Rhizobium is a symbiotic nitrogen-fixing bacterium that forms root nodules in the roots of leguminous plants (like peas, beans, clover). Inside these nodules, the bacterium converts atmospheric nitrogen (N2) into ammonia (NH3), which the plant can use. In return, the plant provides the bacteria with carbohydrates and a protected environment. It significantly reduces the need for chemical nitrogen fertilizers.