Aspecific molecule was separated from a yeast cell and then placed in a flask to find out if it would bind to another molecule. this type of experimental design is called a(n)
a. in vitro observation
b. occupational cohort study
c. age cohort study
d. clinical trial

A; in vitro observation

Explanation:

In-vitro is a process in which an experiment/organism is performed/taking place in a test tube or culture dish (controlled environment) outside of a living organism. Since a specific molecule was taken from the yeast cell and placed in a separate environment outside of its original living organism (the yeast cell), it is under in-vitro observation. A good example of in-vitro observation is IVF (in-vitro fertilization), when an egg from a mother and the sperm from a father fertilizes in a test tube outside of the mother's body and conception happens outside the body in a laboratory until it becomes an embryo and is placed back into the mother's body.

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