BSC 1005 Exam 1 Complete Answers
7 Properties of Life
1. Order: Organisms exhibit complex but ordered organization.
2. Regulation of Internal Environment: Maintaining a stable internal environment, such as temperature
and pH.
3. Growth and Development: Organisms grow and develop according...
1. Order: Organisms exhibit complex but ordered organization.
2. Regulation of Internal Environment: Maintaining a stable internal environment, such as temperature
and pH.
3. Growth and Development: Organisms grow and develop according to specific instructions coded in
their DNA.
4. Energy Processing: Energy is transformed from one form to another to power the organism’s
activities.
5. Response to the Environment: Organisms respond to environmental stimuli.
6. Reproduction: The ability to produce new individuals, either asexually or sexually.
7. Evolutionary Adaptation: Populations evolve adaptations over generations.
Theory of Evolution
- Change Through Time: Refers to genetic changes in a population across generations.
- Unifying Theory of Biology: Connects various observations from the natural world and explains
relationships and diversity among living organisms.
Life's Hierarchy of Organization
1. Biosphere: Global ecological system integrating all living beings and their relationships.
2. Ecosystem: A community of living organisms and their physical environment interacting.
3. Community: A group of interdependent organisms living in a shared environment.
4. Population: A group of organisms of the same species in a specific area.
5. Organism: An individual living entity that can react to stimuli, reproduce, grow, and maintain
homeostasis.
6. System: A group of organs working together to perform complex functions.
7. Organ: Structures composed of two or more tissue types that perform a specific function.
8. Tissue: A group of similar cells that work together to perform a specific function.
9. Cell: The smallest unit of life, possessing the properties of life.
, 10. Organelle: Specialized structures within a cell that perform distinct processes.
11. Molecule: Two or more atoms bonded together, forming the smallest structural unit of a substance.
Natural Selection
1. Mechanism of Evolution: A process through which evolution occurs.
2. Favorable Inherited Traits: Individuals with beneficial traits are more likely to survive and reproduce.
3. Variation in Populations: Natural selection acts on variations within a population.
Types of Biodiversity
1. Genetic Diversity: The variety of genes within a species, indicating variations among individuals.
2. Species Diversity: The variety and number of species present in a habitat or geographic area.
Levels of Biological Organization
- Level 1: Molecule
- Composed of two or more atoms held together by chemical bonds; the smallest unit.
- Level 2: Organelles
- Functional structures within cells (e.g., ribosomes).
Key Organelles:
- Ribosomes: Sites of protein synthesis.
- Nucleus: Control center of the cell where DNA is stored and initial transcription occurs.
- Chloroplasts: Convert sunlight into energy through photosynthesis.
- Mitochondria: Powerhouse of the cell; converts energy from food into usable energy.
- Level 3: Cells
- The smallest units exhibiting living properties, forming the basis of the cell theory.
- Level 4: Tissues
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