Glycolysis, formation of acetyl CoA, Krebs cycle and the electron transport chain are all involved in:

breaking down of glucose

Explanation:

Glycolysis, formation of acetyl CoA, Krebs cycle and the electron transport chain are all involved in the breaking down of glucose, also known as respiration, in living organisms.

During glycolysis, glucose is transformed into 2 molecules of pyruvate with ATP and NADH being generated in the process.

The pyruvate molecules are each oxidized to acetyl CoA, a process that leads to the release of carbon dioxide and the formation of NADH.

The acetyl CoAs then undergo a series of reactions, combining with a 4-carbon molecule and generating ATP, FADH2, NADH, and releasing carbon dioxide. The 4-C molecule is also regenerated during the process. This is known as the Krebs cycle.

All the FADH2 and NADH made from the earlier steps then enter the electron transport chain where they donate their electrons to become FAD and NAD respectively. ATP is generated and water is formed through the reduction of oxygen.

thymine. in rna, thymine is replace by uracil

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.