Bio 10 intro to biology instructor paul nagami laney college
Download
1 / 21

Bio 10: Intro to Biology Instructor: Paul Nagami Laney College - PowerPoint PPT Presentation


  • 118 Views
  • Uploaded on

The Chemistry of Life, Pt. 3. Bio 10: Intro to Biology Instructor: Paul Nagami Laney College. August 30 , 2013. Agenda. Administrative Stuff Essay Outline Instructions Review: Wednesday’s Chemistry Lesson Elements of Life, continued More on pH, Acids , and B ases Buffers

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Bio 10: Intro to Biology Instructor: Paul Nagami Laney College' - kiele


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Bio 10 intro to biology instructor paul nagami laney college

The Chemistry of

Life, Pt. 3

Bio 10: Intro to BiologyInstructor: Paul NagamiLaney College

August 30, 2013


Agenda
Agenda

  • Administrative Stuff

  • Essay Outline Instructions

  • Review: Wednesday’s Chemistry Lesson

  • Elements of Life, continued

    • More onpH, Acids, and Bases

    • Buffers

    • The Pieces that Make DNA

    • The Forest and the Trees

  • Wrap-up


Essay outline
Essay Outline

  • Don’t forget that your essay outline is due in lecture a week from Wednesday

  • Useful sources for articles on relevant research:

    • http://www.sciencedaily.com/

    • http://www.sciencemag.org/

    • http://www.nature.com/

  • If you have questions, please ask sooner than later!


Simplifying the table
Simplifying the Table

On your index card, write your name and try to draw how the electrons of nitrogen (N) are arranged in shells.


Make a guess (what do you recall?)

What are we made of? On your index cards, try to rank the following elements by the mass of them in your body, from most to least.

P) Phosphorus

H) Hydrogen

N) Nitrogen

O) Oxygen

S) Sulfur

C) Carbon

Ca) Calcium

Fe) Iron


What’s a Solution?

A solution is when one substance is mixed perfectly evenly with another, no matter how hard you try to separate them!

Solvent: The major part of the solution. Solute: What gets dissolved by the solvent.



  • OH- vs. H+

More OH- means less H+, and vice-versa.

Acid = proton “donor”

Base = proton “acceptor”


pH, continued

Why do we say that acidic solutions with a lot of H+ have low pH?

There isn’t that much H+ dissociation. Pure water has only .0000001 M of H+. (M = Molar, a unit of concentration)

A strong acid might have .1 M of H+. A strong base might have only .00000000000001 M of H+!

So we count how many places we need to move the decimal point!


Understanding pH

How many M of H+ are there in a solution with pH of 5?

What is the pH of a solution with .000000001 M of H+?

Which solution has more H+? Which is more acidic? Which is more basic?


Buffers

Buffers prevent the pH of a solution from changing too easily.

Bicarbonate buffer system:


Nitrogen (N)

All living things need nitrogen to make DNA and protein!

Dry air is about 80% nitrogen by volume.

But those nitrogen atoms are stuck together in pairs!


Phosphorus (P)

All living things need phosphorus

Usually found as phosphate ions.


Elements of DNA

Phosphorus

Oxygen

Nitrogen

Carbon

Hydrogen


What Are Trees Made Of?

Every year, the General Sherman sequoia adds on over a cubic meter of wood – enough to make a new 15-meter (50-foot) tall tree!

Where does all of this dry mass come from?


Take a guess:

Most of the General Sherman tree’s dry mass is derived from….

A) Water and minerals from the soil.

B) Organic matter from the soil.

C) Energy from the sun.

D) Gas from the air.



ad