During prolonged fasting,which of the following is the correct order of utilization of energy sources in the human body?

Protein cannot be used directly as a respiratory substrate; it breaks down into which of the following?

Choose the incorrect sentence$(s)$ regarding the amphibolic pathway.
$(1)$ Carbohydrates are generally used as substrates for respiration.
$(2)$ Fatty acids can first be degraded into acetyl $CoA$,which enters the respiratory pathway.
$(3)$ In the case of proteins,they are first broken down into amino acids,which are later converted into pyruvic acid and enter the respiratory pathway.
$(4)$ The respiratory pathway is involved in both anabolism and catabolism.
$(5)$ Glycerol would enter the pathway after being converted to $PGAL$.

Identify the respiratory substrates for respiration.

The connecting link among glycolysis,Kreb's cycle,and beta-oxidation of fatty acid is:

Aerobic respiratory pathway is appropriately termed