BELL WORK: Copy the question below and write your
entire answer (NOT just the letter choice!).
Which of the following is not an example of a lipid?
a. The waxy coating on a leaf
b. The main component of a cell membrane
c. A polysaccharide
d. An unsaturated fat
Set up the next page in your journal…
•Page: 23
•Date: 9-28-15
•Title: Proteins
•Essential Question: Why are
proteins so important?
•Yes, Cornell notes!
Before we begin…
•Glue the picture in the top left corner of
your notes.
•Under the picture, write AMINO ACID.
Proteins….here we go!
Structure:
• have a variety of different
shapes
• contain Carbon, Hydrogen,
Oxygen, and Nitrogen (CHON)
• contain an “R-group”
• R-group is like an ID
card
• each R-group has a
charge that attracts
or repels other Rgroups
o this causes each
protein to fold
and twist in very
unique ways
Function (determined by the shape):
•
determine your traits
o
•
skin color, eye color, hair color, even body odor can be based on
your body’s proteins!
build muscle & bone
o
contain 4 calories per gram
o
fewer bonds = less energy
•
speed up chemical reactions in the body
•
help fight disease
Examples:
• enzymes
o end in –ase (amylase, lactase)
• antibodies
• hormones
• collagen
• meat
• eggs
What do we call the pieces of a protein?
• Monomer = amino acid
There are 20 essential amino acids, each
with a different R-group.
Amino acids form peptide bonds to make…
• Polymer = polypeptide
POLYPEPTIDES:
Burning Questions…
•At the bottom of your notes, copy and
answer the question below:
• Why does the meat on a slice of bacon
cook faster than the fat?
• Use the words protein, lipid, bond, & energy
in your answers!
Alka-Seltzer Lab
• See how long an Alka-Seltzer tablet takes to completely
dissolve in 100 mL of room temperature water.
• While you wait, fill in the blanks under “Background” on
your lab sheet.
Alka-seltzer dissolving in water is an example of a
chemical reaction. In class, you observed your teacher
dissolve one tablet(s) into 100 mL of pure water at room
temperature, which took _________ seconds.
Alka-Seltzer Lab
• With your group, figure out a way to • Write out your materials list and
make the tablet dissolve faster. You
may only change ONE VARIABLE!
• Possible changes include:
• liquid it’s placed in
• amount of water
• temperature of water
• size of tablet
• Be creative! Think of something on
your own, as long as you’re only
changing ONE thing about the
experiment.
your procedure. You do NOT have
to fill in all the spaces!!
• You will perform your lab
tomorrow at the beginning of
class.
• I will provide beakers, water, a
heat source, and Alka-Seltzer. Any
other materials are YOUR
responsibility!
Foldable Time!!!
1. At the bottom of the Monomer box,
write the monomer of a protein.
2.At the bottom of the Polymer box,
write the polymer of a protein.
3. Draw an arrow from the monomer
to the polymer.
4.On the INSIDE of the Protein door,
write THREE functions and FOUR
examples.
5.On the FRONT of the Protein door,
draw an amino acid molecule. Be
sure to label the R-group!