Choose the answer which best represents a difference between viruses and viroids. A. Viruses infect many types of cells, whereas viroids infect only prokaryotic cells.
B. Viruses have capsids composed of protein, whereas viroids have no capsids.
C. Viruses contain introns; viroids have only exons.
D. Viruses always have genomes composed of DNA, whereas viroids always have genomes composed of RNA.
E. Viruses cannot pass through plasmodesmata; viroids can.

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.

and after water is usually warmed by the sun the water temperature raises and then evaporates .