The 'powerhouse of the cell' is the: MCQ with Answer and Explanation

Explanation:
Phycoerythrin absorbs blue-green light, which penetrates deeper water, allowing red algae to photosynthesize at greater depths. Fucoxanthin is in brown algae, chlorophyll b green, carotenoids orange.

Explanation:
Meiosis I is the reductional division where homologous chromosomes separate, reducing the chromosome number from diploid (2n) to haploid (n). Meiosis II is equational division, similar to mitosis, separating sister chromatids. Thus, reduction occurs in anaphase I. DNA replication occurs in S phase before meiosis I. Gametes are haploid. Errors in reduction can lead to aneuploidy.

Explanation:
The fluid mosaic model (Singer-Nicolson) depicts the cell membrane as a phospholipid bilayer with embedded proteins, carbohydrates, and cholesterol, giving it fluidity.