A ring of actin filaments contract to form a ________ that pinches the two daughter cells apart.

A. Electron transport chain/oxidative phosphorylation:This stage of cellular respiration produces the majority of ATP, typically about 26–34 molecules per glucose. It relies on the transfer of electrons through protein complexes and the use of a proton gradient to drive ATP synthase activity.

B. oxidation reactions:Oxidation reactions remove electrons from molecules, often transferring them to NAD⁺ or FAD. While essential for energy extraction, these reactions alone do not directly generate large amounts of ATP.

C. substrate-level phosphorylation:This mechanism occurs during glycolysis and the Krebs cycle, producing ATP directly from enzyme-mediated reactions. However, it only accounts for a small fraction of ATP yield, about 2 ATP in glycolysis and 2 in the Krebs cycle.

D. lactic acid production:Lactic acid is formed in anaerobic respiration when pyruvate is reduced to lactate. This process regenerates NAD⁺ for glycolysis but yields no additional ATP beyond the small amount produced in glycolysis itself.

A. adipose CT:Adipose tissue primarily stores fat for energy and cushioning and does not provide the elasticity or vibration properties required for vocal cords.

B. elastic CT:Elastic connective tissue contains abundant elastic fibers, allowing the vocal cords to stretch and recoil during sound production. Its flexibility and resilience are essential for the rapid vibrations needed for speech.

C. areolar CT:Areolar tissue is a loose connective tissue that provides support and cushioning but lacks the dense elastic fibers necessary for vocal cord function.

D. elastic cartilage CT:Elastic cartilage provides flexible support in structures like the ear and epiglottis but is not the main tissue responsible for the vibration and elasticity of vocal cords.