BIO-1801 Lecture Notes - Lecture 2: Horizontal Gene Transfer, Valence Electron, Mass Number

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6 Feb 2017
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Clicker Question: Horizontal gene transfer can result in:
totally unrelated species having similar DNA
Horizontal gene transfer can transfer genes to things with similar genes rather the decent with
modification
Clicker Question: Which of the following has the least number of organisms out of phylum,
kingdom, domain, family
family
Clicker question: which of these comes first in the scientific method: conclusion, prediction,
hypothesis, experiment
hypothesis
in general people make a hypothesis first and then they make predictions to see what may happen
Chapter 2
outline:
properties of atoms
chemical bonds
water
pH concepts
Buffers
Atoms
smallest functional unit of matter that form all chemical substances
cannot be further broken down into other substances by ordinary chemical or physical
means
a specific atom makes up a chemical element
ex: oxygen will always be oxygen
matter exist as a solid, liquid or vapor (gas)
Atomic Structure
Atoms are composed of
protons
positively charges particles
neutrons
neutral particles
electrons
negatively charged particles
number of protons and electrons are typically equal
Key concepts
atomic number and mass number, mass
isotopes
valence electrons
types of chemical bonds
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