Which of the following cell structures uses energy released by enzymes to recharge adenosine triphosphate molecules?
Endoplasmic reticulum
Ribosome
Mitochondria
Lysosome
The Correct Answer is C
a. Endoplasmic reticulum: The ER is involved in protein and lipid synthesis but is not the primary site of ATP synthesis.
b. Ribosome: Ribosomes are involved in protein synthesis but do not play a direct role in ATP production.
c. Mitochondria: Mitochondria are known as the powerhouses of the cell because they generate ATP through cellular respiration. Enzymes in the mitochondria facilitate the release of energy from nutrients, which is then used to recharge ATP molecules.
d. Lysosome: Lysosomes contain digestive enzymes that break down waste materials and cellular debris, but they do not produce ATP.
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Related Questions
Correct Answer is C
Explanation
a. Spermatozoa: These are the mature male gametes (sperm cells) that result from spermatogenesis but do not describe the process of meiosis itself.
b. Spermiogenesis: This is the final stage of spermatogenesis, where spermatids undergo morphological changes to become mature spermatozoa.
c. Spermatogenesis: This is the process that includes both meiosis and subsequent maturation steps, resulting in the formation of spermatozoa. It involves the production of haploid sperm cells from diploid germ cells.
d. Spermatocytes: These are the cells that undergo meiosis during spermatogenesis. Primary spermatocytes undergo the first meiotic division to form secondary spermatocytes, which then undergo the second meiotic division to produce spermatids.
Correct Answer is B
Explanation
a. Left phrenic artery: The left phrenic artery arises from the abdominal aorta, not the ascending aorta. It supplies blood to the diaphragm.
b. Left coronary artery: The ascending aorta is the first section of the aorta, the major artery leaving the heart. It branches out to give rise to several arteries, including the left coronary artery, which supplies blood to the left side of the heart muscle.
c. Left subclavian artery: The left subclavian artery arises from the aortic arch, not directly from the ascending aorta. It supplies blood to the left arm and head.
d. Left intercostal artery: The intercostal arteries arise directly from the aorta, not specifically the ascending aorta. They supply blood to the muscles and tissues between the ribs.
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