Content Approximate % of Test
E M
Cellular and molecular biology
Cell structure and organization, mitosis, photosynthesis, cellular respiration, enzymes, biosynthesis, biological chemistry
15% 27%
Ecology
Energy flow, nutrient cycles, populations, communities, ecosystems, biomes, conservation biology, biodiversity, effects of human intervention
23% 13%
Genetics
Meiosis, Mendelian genetics, inheritance patterns, molecular genetics, population genetics
15% 20%
Organismal biology
Structure, function, and development of organisms (with emphasis on plants and animals), animal behavior
25% 25%
Evolution and diversity
Origin of life, evidence of evolution, patterns of evolution, natural selection, speciation, classification and diversity of organisms
22% 15%
Taken from the collegeboard website. Formatting is a bit wonky, but questions on ecology should be 13% of the biology M test. Barron’s should give you everything you need to do well on the test.