1. Life: Biological Principles and the Science of Zoology Chapter 1

2. Zoology Zoology is the study of animals. Zoology can be broken down further into smaller branches:  Entomology – study of insects  Ornithology – study of birds  Herpetology – study of slimy things (reptiles and amphibians  Mammology – study of mammals  Ichthyology – study of fish

4. Characteristics of Living Things 1. Chemical Uniqueness –We recognize 4 major macromolecules: -Nucleic Acids -Lipids -Carbohydrates -Proteins

5. Characteristics Continued 2. Complexity and hierarchical organization: -Atoms -Macromolecules -Cells -Tissues -Organs -Organ Systems -Organisms -Populations -Species

6. Characteristics Continued 3. Reproduction -Living things reproduce at all levels, from DNA replication to organisms reproducing themselves. -Organisms can reproduce sexually or asexually. -Genetics has an important role in reproduction, especially in sexual reproduction.

7. Characteristics Continued 4. Possession of a Genetic Code -Chromosomes allow for the transfer of traits from parents to offspring. -The genetic code, which is comprised of nucleic acids in DNA, codes for amino acids sequences that make proteins.

8. Characteristics Continued 5. Metabolism:Obtaining nutrients from the environment. -It includes: -digestion -respiration -the synthesis of molecules and structures -The study of metabolic functions is known as physiology.

9. Characteristics Continued 6. Development  All organisms go through a characteristic life cycle which usually start from fertilization and goes until death. Humans – fertilized egg – baby – toddler – child – adolescent – young adult – adult – senior – worm food. Butterfly (metamorphosis) egg – larva – pupa – and adult stages.

10. Characteristics (Last One) 7. Environmental Interactions -All organisms must interact with their environment. -The study of this interaction is called Ecology.

11. Zoology as Part of Biology 1. Animals are eukaryotes. 2. They cannot do photosynthesis. 3. They lack cell walls, hyphae – tubular structures found in fungi.