You are exposed to the same pathogen twice in your lifetime. Which of the following is true?

A.) Your body will fight the second exposure much slower because it has already
used up all its antibodies against that antigen.

B.) The reaction times will be almost equal.

C.) You cannot be exposed to the same pathogen twice in your life because you
already destroyed those pathogens with your Killer T cells.

D.) Your body will fight the second exposure much quicker because it has stored
memory cells against that specific antigen.

the answer would be D

Explanation:

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure