Chapter 1: The Science of Biology Flashcards
What are the characteristics of life?
1.) Cellular organization
2.) Organized complexity
3.) Sensitivity (response to stimuli)
4.) Growth, development, reproduction
5.) Energy utilization
6.) Homeostasis
7.) Evolutionary adaptation
What is the order of the hierarchical organization of life?
atoms, molecules, macromolecules, organelle, cell, tissue, organ, organ system, organism, same species, population, community, ecosystem, biosphere
Deductive reasoning
applies general principals to predict specific results
ex) inferring species of specimen from characteristics
Inductive reasoning
uses specific observations to construct general principals
ex) poodles and dogs observed all have hair, so all dogs have hair
Scientific Method Order
observations, questions, hypothesis, experiments, theory
Hypothesis
- a possible explanation of an observation
- testable
- able to yield predictions
Scientific theory
- a statement of how the world works that is supported by experimental data
- tested frequently and supported by lots of evidence
Evolution
living things are different from how they once began
Thomas Malthus
said that populations increase geometrically (in multiples: 2, 6, 18), while food supply increases arithmetically (2, 4, 6)
Natural selection
the “fittest” individuals will survive and pass on their traits
Artificial selection
breeders chose certain variations of animals (more variation)
When did life begin?
3.8 billion years ago
How old is Earth?
4.5 billion years old
Homologous structures
- same evolutionary origin, different function
- vertebrate limbs
Analogous structures
- different evolutionary origin, similar function
- butterfly and bird wings
Phylogenetic tree
- pattern of descent traced through nucleotide changes in gene sequence
- represents evolutionary history of a gene, like a family tree
Genome
set of DNA instructions that specifies a cell
Bacteria Domain
single-celled, little internal structure
Archaea Domain
prokaryotes or single-celled with little internal structure
Eukarya Domain
- complex cells
- made of Kingdom Protista, Plantae, Fungi, and Animalia