Consider statements about cell biology: 1. The plasma membrane regulates transport. 2. The nucleus contains DNA. 3. Mitochondria produce ATP. Which are correct? MCQ with Answer and Explanation

The plasma membrane (cell membrane) is selectively permeable, regulating the entry and exit of substances into and out of the cell, maintaining internal homeostasis. The nucleus is the membrane-bound organelle that houses the cell's genetic material (DNA) organized into chromosomes, directing cellular activities. Mitochondria are the double-membrane-bound organelles known as the 'powerhouses of the cell' because they are the primary site of aerobic respiration, producing the majority of the cell's ATP (energy currency). All statements are correct.