The word "monosaccharide" should not be capitalized, as it is not a proper noun.
No, you do not. It is a common noun.
Yes
Glucose
do you capitalize the word protestant
It is not necessary to capitalize the word "yo".
No, you do not capitalize the word drama.
A polysaccaride.
monosaccaride
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.
Only capitalize 'spelling' if it is the first word in a sentence.
no or at least not any more than i capitalize the word sentence in a paragraph