Biol 1001 August 28

Biol 1001 August 28 - Chapter Learning Objectives Chapter...

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

View Full Document Right Arrow Icon
Chapter Learning Objectives Chapter 1: Introduction to Life on Earth All scientists believe that 1. events happen based upon natural occurrences, not super natural causes; super natural isn’t ruled out, just can’t be studied 2. natural laws apply at all places and all times (erosion, wind, water. .etc) 3. people perceive events similarly (objectively) Scientists: 1. Do not “prove” things, but their findings may explain something 2. Theorize and hypothesize 3. Do believe in religion; science doesn’t necessarily have to conflict with it Scientific Method: 1. Observation (Something unexpected happens…) 2. Hypothesis (If…Then. . prediction) 3. Experiment ( Controlled test to challenge prediction) 4. Conclusion (If supports hyp, =]; if doesn’t, start over again and modify hyppothesis) Scientific Theories- General statement ab how things operate • Derived through inductive reasoning [inductive= start at problem, end at answer] • Has survived through challenges • Theories are never final or permanent • Used to propose hypotheses (deductive reasoning) 1920-Fleming discovered Penicillin
Background image of page 1

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

View Full DocumentRight Arrow Icon
• Petri dish became contaminated • Bacteria wouldn’t grow near Penicillium mold • Extracted fluid/chemicals from mold; observed that it inhibited growth of bacteria= discovery of antibiotics!!! • Later isolated as Penicillin 1.1 What are the characteristics of living things? • List features that distinguish living organisms from nonliving matter o Complex and organized o Must acquire materials and energy from environment in order to stay alive (sunlight, water, air, food, etc) ▪ Maintaining homeostasis requires energy ▪ Opposes natural trend to disintegration ▪ Obtained from external source ▪ Homeostasis requires physical repair o Uses homeostasis to maintain internal conditions ▪ Literally means ‘stays the same’ ▪ Cells and/or whole body maintains conditions within a certain range ▪ Feedback mechanisms accomplish this (Think body temperature: we sweat when hot and shiver when cold) o Growth ▪ Extension of homeostasis ▪ Growth =homeostasis plus extra ▪ Organism grows in size/mass
Background image of page 2
▪ Must acquire more than homeostasis in or order to grow ▪ Genetically programmed • Timing (when to grow) • Size (how big to grow) • Shape (how to grow) o Responds to stimuli ▪ Internally- temp, water level, blood sugar ▪ Externally- seeks food/water, avoid bitterness, plants grow towards light o Able to reproduce itself ▪ Asexual (splits its’ own cells) / Sexual (sex, pollination, fertilizing eggs) ▪ Perpetuation of their parents’ genes • Genetic info stored in DNA chemical • Has its basis at the cellular level o Has the capacity to evolve/change ▪ Accounts for the unity of life • All organisms share fundamental characteristics (DNA) o Mutations occur in all sorts of DNA which is called evoloution • Common descent ▪ Accounts for diversity in life o Genetic composition of population changes (evolves)
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 03/10/2010 for the course BIOL 1001 taught by Professor Minor during the Fall '08 term at LSU.

Page1 / 38

Biol 1001 August 28 - Chapter Learning Objectives Chapter...

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