Bio 10 intro to biology instructor paul nagami laney college
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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

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Bio 10: Intro to Biology Instructor: Paul Nagami Laney College

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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.


Bio 10 intro to biology instructor paul nagami laney college

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


Bio 10 intro to biology instructor paul nagami laney college

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.


Bio 10 intro to biology instructor paul nagami laney college

pH, continued


Bio 10 intro to biology instructor paul nagami laney college

  • OH- vs. H+

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

Acid = proton “donor”

Base = proton “acceptor”


Bio 10 intro to biology instructor paul nagami laney college

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!


Bio 10 intro to biology instructor paul nagami laney college

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?


Bio 10 intro to biology instructor paul nagami laney college

Buffers

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

Bicarbonate buffer system:


Bio 10 intro to biology instructor paul nagami laney college

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!


Bio 10 intro to biology instructor paul nagami laney college

Phosphorus (P)

All living things need phosphorus

Usually found as phosphate ions.


Bio 10 intro to biology instructor paul nagami laney college

Elements of DNA

Phosphorus

Oxygen

Nitrogen

Carbon

Hydrogen


Bio 10 intro to biology instructor paul nagami laney college

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?


Bio 10 intro to biology instructor paul nagami laney college

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.


Bio 10 intro to biology instructor paul nagami laney college

Review


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