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Nino A. EspinasBiology Unit
PSHS-Main Campus
Biology = bios (life)+ logos (study of)
1. The living world is a hierarchy, with each level of biological structure building on the level below it.Life is highly
organizedLevels of biological
organization: atoms- molecules- organelles- cells- tissues- organs- organ systems- organism- population- community- ecosystem- biosphere
What level/s of bioorganization is/are featured in each item?
1. Gregorio T. Velasquez National Scientist Pioneer Scientist in Blue Green Algae
2. Google Earth
2. Each level of biological structure has emergent properties. Novel properties
emerge that were not present at the simpler levels
“An organism is a living whole greater than the sum of its parts”Are Emperor penguins
(Aptenodytes forsteri) cooperative or selfish?
3. Cells are an organism’s basic units of structure and function. Cell is the lowest
level of structure capable of performing ALL life’s activities
All living things consist of cells
Prokaryotic and eukaryotic cell types
Mitosis- cell divisionWhite blood cells-
human macrophage ingesting Candida albicans
Sperms- Sperm race
4. The continuity of life is based on heritable information in the form of DNA Deoxyribonucleic
acidSubstance of genesUnits of inheritance
that transmit information from parents to offspring
Nucleotides: A, T, G, C, & U
5. Structure and function are correlated at all levels of biological organization Form fits functionBiological structure
gives us clues about what it does & how it works
Function of a structure provides insight about its construction
6. Organisms are open systems that interact continuously with their environmentsAn organism is an
open system- an entity that exchanges materials and energy with its surroundings.
Nutrient Cycling & flow of E from sunlight to photosynthetic life forms
7. Regulatory mechanisms ensure a dynamic balance in living systems. Biological processes
are self regulating, operating by a mechanism called feedback- in which an output or product of a process regulates that process
8. Diversity and Unity are the dual faces of life on earth. There is Unity in
Diversity in ALL living entities of the Earth Paramecium cilia
Throat and intestine villi
9. Evolution is the core theme of biology.Life evolvesEvolution, the process
that have transformed life on Earth from its earliest beginnings to its vast diversity today, is the one biological theme that ties together all others
Natural Selection = Differential Reproductive Success
10. Scientific Inquiry Observation-based
discovery and the testing of explanations through hypothesis based inquiry
11.Science, Technology, and Society Technologies are
goal oriented applications of science
Science and technology must promote and improve NOT just human lives, but ALL organisms on earth as well.
An Inconvenient Truth
Main ReferencesCampbell NA, Reece, JB, and Mitchell
LG.2000. Biology. Addison Wesley Longman. 1175 pp.
Campbell and Reece. 2005. Biology. Pearson Benjamin Cummings. 1231 pp.