Chapter 1: Biology in the 21st Century

biosphere

Everywhere life exists

Biodiversity

Variety of life

Species

Type of living thing

biology

Study of life

Organism

Individual living thing

Cell

Basic unit of all living things

Metabolism

Chemical process to make energy

DNA

Carrier of genetic information

System

Organized group of interacting parts

Ecosystem

Living and nonliving things that interact

Evolution

Change in living thing over time

adaptation

Inherited traits

Observation

Using the 5 senses to gather info

data

Info gathered

Hypothesis

Educated guess

Experiment

Testing hypothesis

independent variable

What CHANGES

Dependent variable

The RESULT of a change

Constant

Stay the same

theory

Very supported but scientific evidence

Microscope

Looking at things magnified

gene

Segment of DNA

molecular genetics

Study of genes at the molecule level

Genomics

Study of genomes

Characteristics of Living things

1. Cells
2. Need energy
3. Respond to environment
4. Reproduce and develop
5. DNA
6. Homeostasis
7. Evolve

Themes of biology

- all levels of life have systems
- structure and function are related in biology
- organisms must maintain homeostasis to survive
- evolution explains the unity and diversity of life

Scientific law

Confirmed and proved

Conflicting evidence is

The reason scientific theories change

Poles to the equator

Biodiversity generally increases

Identifying disease causing gene

A biological advance caused by molecular genetics

Behaviors and negative feedback

The most important need for an organism to maintain homeostasis

Improve human health

Indoor air pollutants lead to respiratory problems is an example of using biology in what way