Consider the following statements about the human heart: 1. The right atrium receives blood from the vena cavae. 2. The left ventricle pumps blood to the lungs. 3. The septum separates the left and right sides. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
DNA replication is semiconservative, producing two identical copies from a template. Transcription makes RNA, translation makes protein.

Explanation:
The placenta acts as a temporary endocrine gland, secreting hCG (which maintains the corpus luteum), hPL (which alters maternal metabolism for fetal growth), and high levels of estrogen and progesterone (which maintain the uterine lining and suppress further ovulation). Prolactin, however, is primarily secreted by the anterior pituitary gland, although its levels rise significantly during pregnancy to prepare the mammary glands for lactation.

Explanation:
Photosynthesis converts light energy into chemical energy (glucose) using CO₂ and H₂O, releasing O₂. It occurs in chloroplasts. Respiration breaks down glucose, fermentation is anaerobic, chemosynthesis uses chemical energy.