BIO-1801 Lecture Notes - Lecture 1: Homeostasis, Binomial Nomenclature, Archaea

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Seven Characteristics of Life
1. Cells and organization:
Organisms maintain an internal order. The simplest unit of organization is the cell.
Cell theory states that all organisms are made of cells, cells are the smallest units of life,
and cells come from pre-existing cells via cell division.
2. Energy use and metabolism:
Organisms need energy to maintain internal order.
Energy is used in chemical reactions collectively known as metabolism.
3. Response to environmental changes
Organisms react to environmental changes that promote their survival
Not genetic changes
4. Regulation and homeostasis
Organisms regulate their cells and bodies, maintaining relatively stable internal
conditions, a process called homeostasis.
5. Growth and development
Growth produces more or larger cells, whereas development produces organisms with a
defined set of characteristics.
Mitosis
6. Reproduction
To sustain life over many generations, organisms must reproduce.
Due to the transmission of genetic material, offspring tend to have traits like
their parents.
meiosis
7. Biological evolution
Populations of organisms change over the course of many generations. (adaptation)
Evolution results in traits that promote survival and reproductive success.
Levels of Organization
1. Atoms
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Document Summary

Seven characteristics of life: cells and organization: The simplest unit of organization is the cell. Cell theory states that all organisms are made of cells, cells are the smallest units of life, and cells come from pre-existing cells via cell division: energy use and metabolism: Organisms need energy to maintain internal order. Energy is used in chemical reactions collectively known as metabolism: response to environmental changes. Organisms react to environmental changes that promote their survival. Not genetic changes: regulation and homeostasis. Organisms regulate their cells and bodies, maintaining relatively stable internal conditions, a process called homeostasis: growth and development. Growth produces more or larger cells, whereas development produces organisms with a defined set of characteristics. To sustain life over many generations, organisms must reproduce. Due to the transmission of genetic material, offspring tend to have traits like their parents. Populations of organisms change over the course of many generations. (adaptation) Evolution results in traits that promote survival and reproductive success.

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