Which of the following statements about protein structure is correct? MCQ with Answer and Explanation

Explanation:
The corpus callosum is a thick band of nerve fibers that connects the left and right cerebral hemispheres, allowing interhemispheric communication. The thalamus is a sensory relay station, hypothalamus regulates homeostasis, pons is part of the brainstem. Severing the corpus callosum results in split-brain syndrome.

Explanation:
Human somatic cells are diploid, containing 23 pairs of chromosomes (22 pairs of autosomes and 1 pair of sex chromosomes). The presence of the Y chromosome determines male sex (XY), while its absence results in female sex (XX). Mutations are random changes in DNA; while some are harmful, many are neutral, and some can be beneficial, providing the genetic variation necessary for evolution. Thus, statements 1 and 2 are correct.

Explanation:
Producers (autotrophs) capture solar energy and form the base of the energy pyramid; they contain the largest amount of energy. Only about 10% of energy is transferred to the next trophic level (primary consumers). Energy decreases at each successive level, making producers the most energy-rich.