Protein digestion begins in the mouth with the physical breakdown of foods by chewing, which increases the surface area for chemical digestion. Chemical digestion of proteins begins with the denaturation of proteins in the stomach and continues with the subsequent breakdown of the resulting polypeptides into amino acids.
Which of the following statements about protein digestion are true? Check all that apply.

a) Most of the hydrolysis of polypeptides takes place in the small intestine.
b) Pepsin is active only in an acidic environment.
c) The primary structure of a protein is destroyed by hydrolysis.
d) Some proteins are broken down into amino acids by the process of chewing.
e) Hydrochloric acid in the stomach denatures proteins and activates some enzymes.
f) The tertiary and secondary structures of proteins unfold due to the action of the enzymes in the gut.

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

the answer is option a.

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