The word "monosaccharide" should not be capitalized, as it is not a proper noun.
do you capitalize the word protestant
It is not necessary to capitalize the word "yo".
No, you do not capitalize the word drama.
Yes
Glucose
Yes, you must capitalize the first word, UNLESS it is a small word, such as "It" or "A" or "The".
Unless "it's" is the first word, there is no need to capitalize.
No, you do not capitalize the second word in the complimentary closing.
Yes, you should capitalize the word after a comma in a sentence.
In a title, you generally do not capitalize the word "for" unless it is the first word or part of a proper noun.
Capitalize the word "to" in a title if it is the first or last word, a proper noun, or a verb.
Yes, you typically do not capitalize the word "to" in titles unless it is the first or last word.