for a biology major, i would strongly recommend the Biology SAT II. This will show the colleges that you can not only do well in your bio class, but you can score high on a standardized test on the subject that the entire nation takes.
My high school recommends at least 2 SATII scores.

As for what tests are REQUIRED, however, you can find this on the schools' websites: (i've done the work for you)
UNC Chapel Hill:
# Test scores - SAT Reasoning Test and/or the ACT (including the writing section, which is offered with both exams).
# If you've taken any AP, IB, or SAT Subject Tests, please provides these scores as well. Please note that certain exam scores are used to place enrolling students in the appropriate math, English, and foreign language courses

Rochester:
Send us your high school transcript showing at least 3 years of grades; your official SAT or ACT scores*; and a letter of recommendation from a teacher or guidance counselor.

GWU:
didn't really say anything about scores ont heir page; call them

Drexel:
Standardized Test Scores
You must take either the SAT or ACT and request that the results be forwarded to Admissions. All students should use the following codes to send score reports to Drexel: SAT 2194 or ACT 3556. For more information please visit CollegeBoard (SAT).
International applicants should refer to International Instructions for additional requirements.
Nursing Co-op applicants who were born outside of the United States � regardless of citizenship, native language, or location of degree-granting institutions � must also review the International Instructions for additional requirements.

SB:

# Have your SAT scores and/or ACT scores reported to Stony Brook (our College Board code is 2548 and our ACT code is 2952). Those taking the ACT are required to submit scores that include the optional ACT Writing Test.


you jsut have to explore the schools' websites.


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to answer the question you left on my comment:
at least one SAT or ACT is required. meaning if you take the SAT you do not have to take the ACT (and vice versa). i have heard that the ACT is more expensive.

however, you can take both if you like (i know people who have). there is a chance that you may do poorly on the SAT but slightly better on the ACT.

when they say and/or does that mean that once you take the SAT you must take the ACT, or if you dont take the sat's, you must take the act's instead?

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