New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Lecture 4

by: Kelly Wetmore

Lecture 4 Bio 242

Kelly Wetmore

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

Lecture 4 notes
Intro Human Physiology
Barbara Van Sciver
Class Notes
Biology, Physiology, BIO242, URI, University of Rhode Island, notes, Lecture
25 ?




Popular in Intro Human Physiology

Popular in Department

This 5 page Class Notes was uploaded by Kelly Wetmore on Thursday February 4, 2016. The Class Notes belongs to Bio 242 at University of Rhode Island taught by Barbara Van Sciver in Winter 2016. Since its upload, it has received 70 views.


Reviews for Lecture 4


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 02/04/16
Friday, May 20, y Enzymes ­ 100 seconds for 1 reaction without enzyme ­ 1 second for 1,000,000 reactions with enzyme ­ Most proteins ­ Catalysts­ speed up reaction rates ­ Specific­ for reactions they catalyze salivary and amylase • Ex: carbs —————————> sugars ­ Substrate ­> bonds in substrate are weakened ­> products ­ Not changed within reaction ­ Recyclable ­ Have an optimum pH and temperature (depends on kind of enzyme) Organic v. Inorganic ­ Organic­ Carbon ­ Inorganic­ no carbon • Exceptions: CO2, CO pH ­ Potential hydrogen ­ Concetration of H+ of a solution ­ pH scale­ 0 ­> 7 ­> 14 1 Friday, May 20, y ­ Acids • A substances that yields hydrogen ions in solution • Ex: HCl ­ Found in stomach­ pH 1­1.5 ­ increase hydrogen ion concentration solution because they fall apart ­ HCl ­> H+ + Cl­ • Ex: H2CO3 ­> H+ + HCO3­ • Only the free hydrogen ions contribute to the acidity  ­ Bases • Remove hydrogen ions from solution, thereby decreasing the hydrogen ion  concentration in a solution • Ex: NaOH (sodium hydroxide) ­ NaOH ­> Na+ + OH­ ­ Salts are formed because of the reaction between acids and bases ­ Human blood pH­ 7.35­7.45 ­ Urine pH­ around 6 Biomolecules ­ Polymerization­ bonding together of monomers  • Condensation reaction­ monomer in, water out • Hydrolysis­ water in, monomer out (splitting with water) 2 Friday, May 20, y Carbohydrates ­ Monomer­ saccharides • CHO • CH2O • C6H12O6­ glucose ­ 1:2:1 ratio • Ribose has 5 oxygens… how many carbons? 5… how many hydrogen? 10 ­ Monosaccharides  • Glucose  • Fructose • Galactose ­ Disaccharides • Sucrose (glucose + fructose) • Lactose (galactose + glucose) ­ Polysaccharide • Glycogen • Starch • Cellulose­ structural form of carbohydrates in plants Protein Monomers ­ Amino acids ­ 20 amino acids 3 Friday, May 20, y ­ 2 carboxyl groups • H2N • COOH ­ ex: Alanine, tyrosine, glutamate, lysine ­ Formation of a peptide bond by a condensation reaction • Carboxyl group + amino group ­> peptide bond ­ Fibrous protein­ Collagen ­ Globular protein­ Insulin Lipids ­ Oily, waxy ­ Simple­ Glycerol + 3 fatty acids (triglyceride) ­ Complex­ 2 fatty acids + something else* Steroids ­ Steroid ring structure ­ Cholesterol­ important for cell membrane ­ Testosterone­ male hormone  ­ Estrogen­ female hormone Phospholipids ­ Hydrophilic (polar) head ­ Glycerol backbone ­ Hydrophobic (non­polar) tails (2 fatty chains) 4 Friday, May 20, y ­ Structures formed by phospholipids in an aqueous environment • Phospholipid bilayer • Micelle 5


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Amaris Trozzo George Washington University

"I made $350 in just two days after posting my first study guide."

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.