What is unique to life

What is unique to life - Example#1 Thermostat, servo...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
What is unique to life? Fig. 1-2 Cell membrane contains protoplasm and somehow inside, cells are "alive." (1) Complex - Cells have very complex macromolecules (DNA, RNA, protein). In general, entropy (disorder) increases [we will return to this point in a later lecture]. However, in Biology, small systems are defined, enclosed in cells, that defy this generalization (2) Movement, Responsiveness (irritability, sensitivity, excitability) (3) Development, Growth, Form (4) Metabolism - exchange energy -Catabolic (breakdown) -Anabolic (build-up) *(6) Homeostasis (regulation)
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Example#1 Thermostat, servo mechanism, negative feedback. Example#2 Weight regulation 1 cookie/day = 25 lb/yr *(7) Evolution is major unifying principle Life on Earth is 3 1/2 billion yrs old (and presumably all organisms have common ancestor) History from primordial "soup" of molecules to biology, extinctions, etc. *(8) Reproduction - "Survival" in biology is to and reproduce and produce fertile offspring. Example#1- One species definition: Reproduce, fertile offspring Horse - donkey (differenty species) mate to produce the mule -- the mule is sterile...
View Full Document

This note was uploaded on 04/14/2011 for the course BIO 120 taught by Professor Stark during the Fall '08 term at Saint Louis.

Ask a homework question - tutors are online