The fluid that lubricates joints and reduces friction is: MCQ with Answer and Explanation

Explanation:
Secondary structure refers to local folding patterns like α-helices and β-sheets. Primary is amino acid sequence; tertiary is 3D folding; disulfide bonds are tertiary/quaternary; denaturation disrupts non-covalent bonds, not peptide bonds.

Explanation:
The Leghorn (specifically the White Leghorn) is a highly popular and productive breed of chicken originating from Tuscany, Italy. It is primarily reared as a layer breed for commercial egg production due to its high egg yield, early maturity, and efficient feed conversion. It is not typically used for meat production (broilers like Cornish Cross are preferred for that) or as cattle. Rhode Island Red is another dual-purpose breed, but Leghorn is specifically famous for eggs.

Explanation:
Luteinizing hormone (LH) triggers ovulation and then promotes the formation and maintenance of the corpus luteum from the ruptured follicle. The corpus luteum secretes progesterone. FSH stimulates follicle growth, prolactin milk production, estrogen from follicles.