Diphtheria toxin is a single, 60-kDa-molecular weight protein composed of two peptide chains, fragment A and fragment B.
no
Is the following sentence factually correct?
"Diphtheria toxin is a single, 90-kDa-molecular weight protein composed of three peptide chains, fragment A, fragment B, and fragment C."
Options:
- yes
- no

There is no know reliable observation of that happening.
no
Is the following a factual statement?
"The Bumblebee flies faster than any other insect."
Options:
- yes
- no

Some Starbucks stores sell pre-packaged food items, pastries, and hot and cold sandwiches; there are also several select "Starbucks Evenings" locations which offer beer, wine and appetizers.
no

Does the following sentence make sense?
"The only product Starbucks locations ever sell is coffee."
Options:
- yes
- no