Which two important factors affect cell differentiation? a. environmental influences and cytoplasmic determinants b. sperm binding and acrosome reaction c. sperm binding and cortical reaction

I would say it's A because it sounds like the most important one.

A. environmental influences and cytoplasmic determinants

Explanation:

Six amino acids have side chains that are polar but not charged. these are serine (ser), threonine (thr), cysteine (cys), asparagine (asn), glutamine (gln), and tyrosine (tyr). these amino acids are usually found at the surface of proteins, as discussed in the proteins 2 module.