A gene can best be defined as

False:Pyruvic acid is converted into lactic acid only under anaerobic conditions, when oxygen is insufficient for the mitochondria to carry out aerobic respiration. When oxygen is present, pyruvic acid enters the mitochondria and is converted into acetyl CoA, which then enters the Krebs cycle for aerobic respiration. Lactic acid formation does not occur under these oxygen-rich conditions.

A. Melanocytes:Melanocytes are specialized cells that produce melanin to protect against UV radiation. They do not function as sensory receptors and are not involved in touch sensation.

B. Keratinocytes:Keratinocytes form the majority of the epidermis and provide a protective barrier. While they interact with other skin cells, they do not detect sensory stimuli.

C. Adipocytes:Adipocytes are fat cells located in the subcutaneous layer. They serve as energy storage and insulation but are not involved in sensing touch.

D. Dendritic cells:Dendritic cells are immune cells in the skin that detect pathogens and present antigens. They play a role in immune defense rather than tactile sensation.

E. Tactile cells:Tactile cells, also known as Merkel cells, are specialized mechanoreceptors located in the basal layer of the epidermis. They detect light touch and pressure, transmitting sensory information to sensory neurons.