Cellular Respiration and Enzymes

The phosphagens are energy storage compounds, also known as high-energy phosphate compounds. They are chiefly found in muscular tissue in animals. ATP molecules can provide energy for only a few seconds of strenuous muscular activity. Thus muscle cells have backup energy storage compound, creatine phosphate, that can be stockpiled. The energy stored in creatine phosphate is transferred to ATP as needed. But during vigorous exercise, the supply of creatine phosphate is quickly depleted. Muscle cells must replenish their supplies of these energy-rich compounds. Chemical energy is stored in muscle fibers in glycogen, a large polysaccharide formed from hundreds of glucose molecules. Glycogen can be degraded, yielding glucose, which is then degraded in cellular respiration. When sufficient oxygen is available, enough energy is captured from glucose to produce needed quantities of ATP and creatine phosphate.

• EC number is a numerical classification scheme is based on the chemical reactions which are catalyzed by them. 
• A system of enzyme nomenclature is associated with a name for the corresponding enzyme. 
• The number classification can be referred to that enzyme which is involved in digestion.
  

Active transport from outside to the inside of molecules across a membrane requires ATP. It is required in transferring solutes across the membrane may be through an ATPase which creates ph gradient across the membrane. Thus, the correct option is C.

There are two types of absorption mechanisms i.e., active and passive transport. Active transport is the movement of solute or solvent molecules against the concentration gradient. It requires the expenditure of energy in the form of ATP. Thus, the correct answer is option B.

In active transport, substances move against a concentration gradient across a cell membrane. Hence energy is required. The energy available in the body in the form of ATP is used to move this substance across the cell membrane. Thus the correct answer is option C.

• Active transport is a process by which molecules move across the cell membrane from a region of low concentration to a region of high concentration against the concentration gradient using energy.
  
• This energy requirement is fulfilled by the ATP molecules (metabolic energy).
• The substances which are transported across the cell membrane by active transport are- Na+, K+, Mg2+, and Ca2+.
  
• So, the correct answer is 'Requirement of energy'.

Active transport is a physiological or biological process mediated by membrane proteins, not a simple chemical reaction. It relies on ATP, uses carrier proteins, and is highly sensitive to metabolic inhibitors and enzymes that regulate these proteins.

• Active transport can be defined as the movement of molecules or ions across a plasma membrane from a region of lower concentration (of molecules or ions) to a region of higher concentration, against the concentration gradient. 
• For this cellular energy is required which is available in the form of ATP molecule and enzymes.
• So, the correct answer is 'All of the above'.

Active transport (secretion) is an energy-dependent process that selectively moves a substance against its electrochemical gradient across a cell membrane. It is an energy dependent process, in which ATP is utilised.

Acetyl CoA is the central intermediate in metabolism, produced from both the breakdown of carbohydrates (via pyruvate) and fatty acids (via beta-oxidation).

Enzyme activators are molecules that bind to enzymes and increase their activity. They are the opposite of enzyme inhibitors. These molecules are often involved in the allosteric regulation of enzymes in the control of metabolism.

Enzymes are biological molecules (typically proteins) that significantly speed up the rate of virtually all of the chemical reactions that take place within cells by lowering the activation energy required for the reaction. It alters the pathway but doesn't take part in the reaction.