0907

Information about 0907

Published on January 9, 2008

Author: Marco1

Source: authorstream.com

Content

Some Major Concepts in Biology:  Some Major Concepts in Biology Evolution Living things share characteristics Cells are the basic unit of life Hierarchical organization Chapter 1 in textbook Living organisms possess all of these characteristics:  Cellular organization Living things consists of one or more cells Cells are organized Change over time Many living things grow Living things evolve or go extinct Interaction Within an organism (cells, organs) Between organism and its environment Between different organisms Living organisms possess all of these characteristics Slide3:  Reproduction Have a blueprint of their characteristics (genes) Produce offspring similar to themselves Transformation of energy Acquire and use energy Carry out and control numerous chemical reactions Emergent properties The whole is equal to greater than the sum of the parts Living organisms possess all of these characteristics 3. Cells are the basic unit of life:  3. Cells are the basic unit of life All organisms consist of cells Cell membranes separate an organism from the external environment All cells originate from preexisting cells Organisms have evolved from single celled to multicellular 4. Hierarchy of organization:  4. Hierarchy of organization Biology is organized into a hierarchy of levels: Atomic particles - elements Elements – molecules Molecules – cells Cells – tissues Tissues – organs Organs – systems Systems – organisms Organisms – populations Populations – communities Communities - biosphere Biological Chemistry:  Biological Chemistry Why are we studying it? Water Polar structure Hydrogen bonds between water molecules Carbon & biologically important molecules Carbohydrates Lipids Proteins Nucleic acids B. The importance of water chemistry in biology:  B. The importance of water chemistry in biology Water is the most abundant molecule in living organisms Water has chemical properties important for life An individual water molecule (H2O) is polar: Neither positive or negative One end is slightly negative Other end slightly positive Polarity of water molecules makes it a good solvent:  Polarity of water molecules makes it a good solvent Water molecules surround other molecules & forms bonds with them – dissolves them Polar and charged molecules dissolve easily (Na+, Cl-) Non-polar substances do NOT dissolve easily (oil) Polarity of water also means that it can be contained in membranes (which are non-polar) Salt dissolving in water b) Water molecules form hydrogen bonds with each other:  b) Water molecules form hydrogen bonds with each other Bonds form between slightly negative oxygen of one molecule with slightly positive hydrogen of another nearby water molecule forming hydrogen bonds hydrogen bonds Many hydrogen bonds together are fairly strong Large amount of energy required to break hydrogen bonds Large amount of energy stored in formation of hydrogen bonds This energy exchange Because hydrogen bonds strongly bind H2O molecules, water has certain properties important for life::  Because hydrogen bonds strongly bind H2O molecules, water has certain properties important for life: Cohesion: Water molecules stick together Water can be pulled up vessels – plants, tree tops Surface tension: Surface of water difficult to puncture Skimming insects Density of water: Maximum density of water at 4oC H-bond orientation increases space between molecules when frozen Ice floats – bodies of water freeze from top down Life persists under ice Because large amount of energy required to break hydrogen bonds between water molecules water has Thermal properties important for life: :  Melting and freezing High energy input to melt ice or freeze water Moderates earth’s temperature – slow melting and freezing Heating and cooling High specific heat – energy required to change water temp 1oC Temperature of bodies of water heat & cool slowly Temperature of animal bodies are stable Evaporation High heat of vaporization – energy required to change water to gas Evaporation of water releases large amount of heat Evaporative cooling - sweating Because large amount of energy required to break hydrogen bonds between water molecules water has Thermal properties important for life: C. Ionization of water molecules:  C. Ionization of water molecules Water ionizes (splits) to form a proton, H+, and a hydroxyl ion, OH- Reaction is reversible Some substances dissolve in water and release H+ (acids) Some dissolve in water & release hydroxyl ions OH- (bases) HCl is an Acid Increases H+ Ionization & pH:  Ionization & pH pH scale indicates strength of a solution of an acid or base Scale 1-14 H+ & OH- concentrations in water are about equal (10-7 moles/liter) Water has a pH of 7 & is neutral – neither an acid or base Low pH (acidic) = greater concentration of H+ High pH (basic) = greater concentration of OH- Most biological fluids have a pH between 6-8

Related presentations


Other presentations created by Marco1

Introduction to Graph Rewriting
10. 01. 2008
0 views

Introduction to Graph Rewriting

shoretel6 1
08. 01. 2008
0 views

shoretel6 1

indi food
10. 01. 2008
0 views

indi food

barclays
11. 01. 2008
0 views

barclays

EVERYONES BUSINESS
12. 01. 2008
0 views

EVERYONES BUSINESS

newbrnresus
15. 01. 2008
0 views

newbrnresus

Information Campaign Salvi
15. 01. 2008
0 views

Information Campaign Salvi

24346
15. 01. 2008
0 views

24346

Wildlife  And  Conservation
15. 01. 2008
0 views

Wildlife And Conservation

Baxter
16. 01. 2008
0 views

Baxter

tyner purdue
23. 01. 2008
0 views

tyner purdue

italian renaissance
05. 02. 2008
0 views

italian renaissance

The Tudors
11. 02. 2008
0 views

The Tudors

Attitudes 2
17. 01. 2008
0 views

Attitudes 2

Textiles
25. 01. 2008
0 views

Textiles

Bristol MurderXNtMvFSZ
28. 01. 2008
0 views

Bristol MurderXNtMvFSZ

McCarthy
30. 01. 2008
0 views

McCarthy

2 Saving Money Time HEEP Area 1
07. 02. 2008
0 views

2 Saving Money Time HEEP Area 1

5WR N Africa SW Asia
13. 02. 2008
0 views

5WR N Africa SW Asia

Fundraising
15. 02. 2008
0 views

Fundraising

gabidimeworkshop
22. 01. 2008
0 views

gabidimeworkshop

Hmong American Elders
29. 01. 2008
0 views

Hmong American Elders

R2 Solutions
20. 02. 2008
0 views

R2 Solutions

Festivals around the world
22. 02. 2008
0 views

Festivals around the world

Mercury Mars Venus
24. 01. 2008
0 views

Mercury Mars Venus

BookofMormonChapter7 8and9
12. 02. 2008
0 views

BookofMormonChapter7 8and9

CNE354HellGreece4
25. 02. 2008
0 views

CNE354HellGreece4

Lessons from Bees
25. 02. 2008
0 views

Lessons from Bees

PS 280 13 mood disorders
27. 02. 2008
0 views

PS 280 13 mood disorders

ASEE Annual Conf 2005 OFI
14. 01. 2008
0 views

ASEE Annual Conf 2005 OFI

fitness
29. 02. 2008
0 views

fitness

PrimalSeasCvt
11. 02. 2008
0 views

PrimalSeasCvt

WETICE2004 Albrechtsen
03. 03. 2008
0 views

WETICE2004 Albrechtsen

Gregory Thomas PPT
14. 03. 2008
0 views

Gregory Thomas PPT

Poster Template FOR VOLUNTEERS
27. 03. 2008
0 views

Poster Template FOR VOLUNTEERS

Respirators
22. 01. 2008
0 views

Respirators

All about me
14. 04. 2008
0 views

All about me

The Popcorn Process
07. 02. 2008
0 views

The Popcorn Process

79989
18. 04. 2008
0 views

79989

ASFP
21. 04. 2008
0 views

ASFP

Forest3 302
22. 04. 2008
0 views

Forest3 302

auxFundamentals
24. 04. 2008
0 views

auxFundamentals

ShowalterPPT
11. 01. 2008
0 views

ShowalterPPT

umist
04. 02. 2008
0 views

umist

L7 global
08. 05. 2008
0 views

L7 global

unit 1 2
19. 03. 2008
0 views

unit 1 2

2005121133941157
30. 04. 2008
0 views

2005121133941157

sykianaki1 10d04
02. 05. 2008
0 views

sykianaki1 10d04

fraseri
02. 05. 2008
0 views

fraseri

ORNISBGCore2007
05. 02. 2008
0 views

ORNISBGCore2007

agriscience basic ag awarness
24. 01. 2008
0 views

agriscience basic ag awarness

Community Greening Training
10. 03. 2008
0 views

Community Greening Training

introToIR
17. 01. 2008
0 views

introToIR

ingels 160305
24. 01. 2008
0 views

ingels 160305

Delhot
10. 01. 2008
0 views

Delhot

olimpic games
14. 04. 2008
0 views

olimpic games

mmo 32
05. 03. 2008
0 views

mmo 32

11 04
04. 02. 2008
0 views

11 04

cccarlos
28. 02. 2008
0 views

cccarlos

funding Opps and guidance
21. 01. 2008
0 views

funding Opps and guidance

session 29 a Karen Donnet Jones
17. 01. 2008
0 views

session 29 a Karen Donnet Jones

XueJishan Boulder 2006 11
16. 04. 2008
0 views

XueJishan Boulder 2006 11

Covenant Counseling Presentation
28. 01. 2008
0 views

Covenant Counseling Presentation

LV PERF
20. 02. 2008
0 views

LV PERF

1866 07 E Dalen Geog
17. 01. 2008
0 views

1866 07 E Dalen Geog