The fluid that fills the anterior chamber of the eye is: MCQ with Answer and Explanation

Explanation:
Bt cotton is a transgenic crop developed by inserting cry genes (e.g., cryIAc, cryIIAb) from the soil bacterium Bacillus thuringiensis (Bt). These genes code for crystal proteins (Cry proteins) that are toxic to certain insect pests, particularly the cotton bollworm. When the insect ingests the protein, it is activated in its alkaline gut, creating pores in the gut lining, leading to the insect's death.

Explanation:
Parathyroid hormone (PTH) raises blood calcium by increasing bone resorption, kidney reabsorption, and activating vitamin D. Calcitonin lowers calcium. Thyroxine regulates metabolism, insulin glucose.

Explanation:
Retroviruses (e.g., HIV) possess two copies of single-stranded RNA and the enzyme reverse transcriptase, which transcribes the RNA into DNA upon infection. This DNA integrates into the host genome. Other viruses may have dsDNA, ssDNA, or dsRNA, but the defining feature of retroviruses is the RNA genome and reverse transcription.