80 multiple-choice questions, 60 minutes
60 of the 80 questions are common to both Biology E and M, then there are 20 specialized questions for each section
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Units are in Metric System only
E stands for ecology and M stands for molecular. SAT Subject Test Biology E focuses more on biological communities, populations and energy flow. SAT Subject Test Biology M foucses more on biochemistry, cellular structure and processes, like photosynthesis and respiration.
Cellular and molecular biology
Cell structure and organization, mitosis, photosynthesis, cellular respiration, enzymes, biosynthesis, biological chemistry
Ecology
Energy flow, nutrient cycles, populations, communities, ecosystems, biomes, conservation biology, biodiversity, effects of human intervention
Genetics
Meiosis, Mendelian genetics, inheritance patterns, molecular genetics, population genetics
Organismal biology
Structure, function, and development of organisms (with emphasis on plants and animals), animal behavior
Evolution and diversity
Origin of life, evidence of evolution, patterns of evolution, natural selection, speciation, classification and diversity of organisms