BIO CHAPTER 1

BIO CHAPTER 1 - BIO CHAPTER 1 18:48 Dictionary definition...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
BIO CHAPTER 1 18:48 Dictionary definition of life is: “the quality that distinguishes a vital and functioning being  from a dead body” Living things are more than the sum of their parts and as a result life is very difficult to  define Certain characteristics define what is technically “alive”  Characteristics defining LIFE: -structure is complex -Acquire materials and energy from the environment -Maintain Internal conditions (ex: temperature) -Growth (ex: increasing number of cells) -Living things will respond to stimuli (ex of stimuli: nerves; touching something hot) -Abiliity to reproduce (sexual/asexual)  -Capacity to evolve  Living things are both complex and organized -Salt: Organized but simple (non living)  -Ocean: Complex but unorganized (non living) -Water flea: Complex and organized (living)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Each level of complexity or structure is based on the one below it.  (ex: Figure 1-1 in textbook) The cell is the smallest unit of life  Living this respond to stimuli -organisms sense and respond to internal and external environmental stimuli Sensory organs detect and respond to external stimuli  Examples of external stimuli: Light Sound Chemicals -Plants and bacteria respond to stimuli as well Light Attraction towards different nutrients  Living things Maintain Internal conditions - Homeostasis : Maintenance of relatively constant internal conditions body temperature pH of blood Water concentration
Background image of page 2
-Automatic mechanisms maintain homeostasis  Sweating in hot weather or during exercise  Metabolizing more food Basking in the sun to raise body temperature -Organisms still grow and change while maintaining homeostasis  Living things require and use materials and Energy -Materials and energy required to maintain organization, grow, and reproduce  -important materials (nutrients) acquired from air, soil, water, or other living things  - Metabolism  is the sum total of all the chemical reactions needed to sustain life -Organisms obtain energy in two ways
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/21/2012 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

Page1 / 10

BIO CHAPTER 1 - BIO CHAPTER 1 18:48 Dictionary definition...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online