Why is the cell (plasma) membrane composed of two phospholipids with the "heads" facing outwards? A)The cytoplasm and environment outside of the cell is made of water. The “head” of the molecules are attracted to the water. B) the tails are attracted to each other because of hydrogen bonding C) The cytoplasm and environment outside of the cell is made of carbohydrates. The “head” of the molecules are attracted to the carbohydrates. D) the tails are attracted to each other because of ionic bonding

the answer is either b, or c I'm not sure I'm sorry it's been a while for me

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.

this protocol provides a detailed procedure for agarose-based ip to purify and enrich the protein of interest.