Get 2 days of unlimited access
Study Guides (350,000)
US (190,000)
BU (5,000)
CAS BI (300)
Study Guide

[CAS BI 108] - Final Exam Guide - Everything you need to know! (88 pages long)


Department
Biology
Course Code
CAS BI 108
Professor
Francis Monette
Study Guide
Final

This preview shows pages 1-3. to view the full 88 pages of the document.
BU
CAS BI 108
FINAL EXAM
STUDY GUIDE

Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

Lecture 2 1/17/14 12:05:00 PM
Earth was formed a little less than 4 bya
Prokaryotes = bacteria and archaea
Billion years later the eukaryotes were formed (high organization of
compartments but not really essential for life because the prokaryotes don’t
have this and they are still living)
Things shared in common between the two:
!Outer limiting membranes, mitochondria
!Plasma membrane is essential for life forms because it is semi
permeable so it is selective so some things can go in and out
Where does life begin?
!Atoms small molecules large molecules, proteins, nucleic acids
cells organism
!Water = 70%
!Macromolecules = 27%
o!Proteins
!Polypeptides (poly amino acids), nucleic acids like RNA
and DNA made up of strands of nucleotides (poly-
nucleotides), carbohydrates (polysaccharides), lipids
must be a little bit water soluble to be useful
!Ions and small molecules = 3%
What are the chemical properties of bio-molecules?
!All must contain carbon
o!Carbon is not water soluble (non-polar)
!Function in aqueous environment
!All bio-molecules are water soluble
Bohr model of water
!Two polar covalent bonds (OH bonds)
!Water is polar, hydrophilic
Insert table 2.1
!Covalent bond, sharing of electron pairs, 50-110 KCAL/MOL (bond
energy)
o!Bond energy is the energy amount needed to separate two
bonded or interacting atoms under physiological conditions in
aqueous environment
Chemical bonds
!Covalent
find more resources at oneclass.com
find more resources at oneclass.com
You're Reading a Preview

Unlock to view full version

Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

!Non-covalent
o!Hydrogen bonds, two polar molecules are needed
!Sharing of an H atom, 3-7 KCAL/MOL
o!Nonpolar – hydrophobic ex. ethane
o!Van der Waals – interaction of electrons of nonpolar
substances
o!Ionic bonds – forms when atoms gain or lose an electron(s)
thus producing a charged particle, attraction of opposite
charges
Important characteristics of biomolecules:
!Solubility
!Size
!Charge
!Water
!Environmental pH
find more resources at oneclass.com
find more resources at oneclass.com
You're Reading a Preview

Unlock to view full version