The best replacement for biochemistry is chemistry.

The best alternatives to biochemistry are rated as following:
★★★★★  chemistry
★★★★  molecular biology
★★★★  biology
★★★  organic chemistry
★★★  microbiology
★★★  biology major
★★  chemical engineering
★★  biotechnology
★  neuroscience
★  pharmacology
★  chemistry major
★  biomedical engineering
★  chemical biology
★  biological sciences
★  neuroscience major
★  biology degree
  physiology
  genetics
  biomedical
  biomedical science
  biophysics
  bioengineering
  biochemical engineering
  microbiology which is better
  biotechnology which is better
  biological chemistry

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Speaking about biochemistry, one probably shouldn't forget about organic chemistry.

Other search terms related to biochemistry and their ratings are:
★★★★★ organic chemistry
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biochemistry
chemistry
molecular biology