Choose all the true statements about protein digestion and hydrolysis.
A. The chemical digestion of proteins begins in the mouth with the process of mastication.
B. In the small intestine, carboxypeptidase attacks peptide bonds.
C. Free amino acids are passively absorbed through the intestinal wall.
D. Pancreatic juices are more acidic than gastric juices.
E. Pepsin causes the hydrolysis of some of the peptide bonds in proteins.

A, B, C and E

Explanation:

A. The moment food mixes with saliva in the mouth when chewing, chemical digestion starts, because saliva contains enzymes that breaks down carbohydrates.

C. Free amino acids can either take passive or active transport system, thus it can be absorbed through intestinal wall.

E. Pepsin acts as a catalyst to the hydrolysis of the peptide bond. The reaction enables the process of digestion by breaking down the protein into smaller pieces.

B. Carboxyperptidase attacks or cleave the peptide bonds, also Trypsin do attacks or cleave the peptide bonds.

However,

D. Pancreatic Juice are more alkaline in nature, while gastric juice are more acidic in nature.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]