Question

question 3
explain why cooked egg white never turns back into the clear egg white seen in a raw egg.
because the protein is denatured in raw egg white
because the protein is denatured in cooked egg white
because the denaturing of the egg proteins is not reversible

question 4
what level of protein structure is associated the alpha helix and beta - pleated sheet?
tertiary
primary
secondary

Explanation:

For Question 3, when egg - white is cooked, proteins are denatured and this denaturation is not reversible, preventing it from returning to its raw state. For Question 4, alpha - helix and beta - pleated sheet are secondary protein structures formed by local folding of the polypeptide chain due to hydrogen bonding.

Answer:

Question 3: because the denaturing of the egg proteins is not reversible
Question 4: secondary