What About "Affirmative Action Grading"?

In many states, it's acceptable, legal and even desirable (according to many) for publicly-funded universities to engage in state-sponsored racial discrimination by applying double standards  and special preferences for certain minority groups when considering students for: a) admission to the university, and b) scholarship funding once accepted, i.e. practice "affirmative action."

Q1: If affirmative action is acceptable, legal and desirable for admissions and scholarship funding when practiced by a university's admissions and financial aid offices, should it also be acceptable, legal and desirable for professors at that university to engage in the practice of "affirmative action" when assigning grades in college classes, i.e. apply racial double standards and race-based preferences for test scores and letter grades? 

Why or why not?  

Q2: Is it consistent for somebody to support affirmative action when practiced by a staff member in the admissions or financial aid office of a university in one building on a college campus, but not support "affirmative action grading" when practiced by a college professor on that same college campus in another building?   

Stated differently, is it logically consistent for somebody to find "affirmative action grading" objectionable, but not find "affirmative action admissions" objectionable?  If race-neutral grading is the accepted standard for the treatment of students IN the classroom, can race-based preferences be justified when selecting students for admission to the university in the first place?