Enger-Ross/Concepts in Biology, 9/e

Key Features

Chapter 2: Simple Things of Life
This chapter was reworked to simplify the information on atomic theory and the energy levels within atoms. Material was added or modified to provide a better understanding of anions, cations, radionuclides, and colloids.

Chapter 3: Organic Chemistry: The Chemistry of Life
Changes were incorporated to show the practical applications of and reasons for knowing organic chemistry. New material includes information on antibodies and the nature of the immune system and additional information on anabolic steroids, monomers, and polymers.

Chapter 4: Cell Structure and Function
Included in this chapter is new information on cell walls, peroxisomes, microtubles, microfilaments, the cytoskeleton, prokaryotic flagella, and the concept of surface area-to- volume ratio.

Chapter 6: Biochemical Pathways
Although the content of this chapter has not changed significantly, several pedagogical changes were made in the section on photosynthesis. Additional information was provided on photosynthetic pigments, C3 and C4 plants, and transpiration and stomates. In addition, new flow charts were added to help students compare aerobic and anaerobic respiration with prokaryotic and eukaryotic cells.

Chapter 7: DNA and RNA: The Molecular Basis of Heredity
This chapter has received significant revision to reflect the changes that have occurred in this rapidly advancing field. There is a new presentation on the central dogma and its relationship to DNA, RNA, and protein synthesis. Information was added on the nature of bacterial chromosomes, antibiotics that target DNA of prokaryotic cells, and the significance of telomeres.

Chapter 10: Mendelian Genetics
Revisions to this material provide a significant new approach. Specific information about several human genetic problems such as cystic fibrosis, Tourette syndrome, muscular dystrophy, spina bifida, Marfan syndrome, neurofibromatosis, and several other human genetic abnormalities was added.

Chapter 13: Speciation and Evolutionary Change
This chapter has a completely revised section on human evolution and additional information on recent thinking that Neandertals were a separate species from Homo sapiens.

Chapter 14: Ecosystem Organization and Energy Flow
Included is a new "How Science Works" reading that presents recent thinking about the concept of climax communities.

Chapter 15: Community Interactions
Added new information on carbon dioxide and its relationship to global warming and the importance of habitat size to the survival of species expands this chapter.

Chapter 16: Population Ecology
This chapter contains a reorganized section on limiting factors.

Chapter 17: Behavioral Ecology
This chapter was significantly rewritten to emphasize the difference between instinct and learning and to more clearly describe different kinds of learning.

Chapter 18: Materials Exchange in the Body
Included in this chapter is a new historical "How Science Works" reading that describes early studies of digestive physiology that occurred as a result of a stomach wound to a young French Canadian fur trader.

Chapter 19: Nutrition: Food and Diet
Added is a new section on nutritional myths.

Chapter 20: The Body's Control Mechanisms
This chapter contains a significant new section on brain function and a new "How Science Works" which deals with how discoveries are made about brain function.

Chapter 22: The Origin of Life and Evolution of Cells
This completely rewritten and reorganized chapter includes the most recent thinking about the origin of life. The reorganization allows students to more easily see major steps thought to have been important in the origin and early evolution of life. It contains new section on the three domains of life.

Chapter 25: Plantae
A significantly reorganized chapter with much new material on plant structure, life cycles, and responses plants make to changes in their surroundings. There is a new summary table on plant taxonomy.

Chapter 26: Animalia
This chapter includes information on temperature regulation and hibernation as well as new material on frog extinction and a new summary table of animal taxonomy.

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