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CP Biology
Name
KEY
Date
HOMEWORK
PACKET
UNIT 2B:
Basic Biochemistry
Proteins
Period
Proteins
1) What are the small, repeating units (monomer units) of proteins called?___amino
acids_______
2) What are two different names for the type of bonds which join two protein units?
__covalent bond________________ and ____peptide bond_________________
3) List the parts of an amino acid: ___1) central carbon atom (C), 2) carboxyl group (COOH), 3) amino group (-NH2), 4) lone hydrogen (-H), 5) R-group (radical) /
Variable.______________________
4) Draw the general structure of an amino acid. Circle the R group, draw a square around the
carboxyl group and draw a triangle around the amino group.
5) What part of an amino acid differs from one type amino acid to the next? (circle one )
amino group (-NH2-)
groups
organic acid (-COOH)
central carbon
R
6) List the name and function of a specific protein: __Hemoglobin caries oxygen in the red
blood cell, actin and myosin are muscle proteins that help our heart to beat and our arm and leg
muscles to move, and collagen is a protein that keeps our skin soft and
supple._______________________
7) How many amino acids are combined to form a dipeptide? ____2_______ a tripeptide?
_____3______
How large are most proteins? __larger than 50 amino acids but typically hundreds of
amino acids long
8) What is the general name of a protein that catalyzes (speeds up) chemical reactions?
_enzyme____
9) Give a more specific name for a protein in your digestive system that speeds hydrolysis of
lipids.
___lipase __________
10) What happens to the structure of a protein as it is heated to a high temperature? What effect
does this have
on its function? ____The three dimensional structure of the protein denatures (unfolds) due
to the stress on the weak hydrogen bonds created by the intense molecular movement of the
atoms (caused by the increased energy from the high heat). Without its specific 3-d shape,
it loses its ability to function!
11) Complete the following analogies:
a) amino acid is to protein as glycerol and 3 fatty acids are to
___triglyceride_______________
b) carbohydrate is to glycogen as protein is to _catalase, hemoglobin,
actin/myosin__(many possible answers)
c) synthesis is to proteins as hydrolysis is to __amino acids______________________
12) Name 5 foods that are rich sources of proteins.
Nuts, soy, eggs, dairy, beans
13) How many amino acids are in the polysaccharide shown below?
How many peptide bonds does it contain?
3
How many water molecules were created when it was formed?
14) All proteins contain these elements:
4
C,H,O, & N
3