Download Biochem Option (D)

BIOCHEM OPTION (B)
B1
Calculate the energy value of a food from enthalpy of combustion data.
Key ideas:
Q = m*c*ΔT
c = specific heat of a substance (4.18 J/g̊ C)
* = the substance CHANGING Temp.
Assumption Q lost = Q gained
SAMPLE PROBLEM
1.00 g of cereal raises the temperature of 400. cm3 of water in an insulated
food calorimeter from 23.7̊C to 33.4̊C. Calculate the energy value per
gram of the cereal, assuming the heat capacity of a calorimeter is
negligible and given the specific heat of water = 4.18 J/g ̊C.
WARM-UP 1/5
1. Draw the general formula of 2-amino acids
2. Describe the characteristic properties of 2-amino acids
Zwitterions- m.p., b.p., solubility in water
Amphoteric
B.2.3
Describe the condensation reaction of 2-amino acids to form
polypeptides
When do they become “proteins”?
B.2.4
Describe and explain the primary, secondary, tertiary and quaternary structure
of proteins
B.2.5
Explain how protein can be analyzed by chromatography and electrophoresis
B.2.6
List the major function of proteins in the body
Structural
Biological Catalysts
Hormones
Antibodies
Transport
Energy*
HOMEWORK
B3-carbohydrates and B4-lipids
Tomorrow B8 Nucleic Acids
B8 NUCLEIC ACIDS
B.8.1: Describe the structure of nucleotides and their condensation polymers
(nucleic acids or polynucleotides):
Phosphate group, pentose sugar, nitrogen base
Genetic code = it’s all about the nitrogen bases!
B.8.1
Distinguish between structures of DNA and RNA
DNA = thymine, RNA = uracil
DNA = deoxyribose
RNA = ribose
CONDENSATION REACTION
Forms nucleoside (nitrogen base and pentose sugar) then complete nucleotide
(with the phosphate group)
• Acidity/basicity of nucleotide and component parts?
• Charges?
NUCLEIC ACID
Polymer of nucleotides
Enzyme catalyzed condensation reaction
B.8.3
Explain the double helical structure of DNA
• Secondary structure
• Why do Adenine and Thymine only pair with each other (and Cytosine and
Guanine)?
WHY THE HELIX?
B.8.4
Describe the role of DNA as the repository of genetic information and
explain its role in protein synthesis.
• What is a gene?
• How does the DNA in your cells compare with one another? With other
organisms of the same species? Different Species? Offspring?
• What might happen if a part of a gene is damaged?
PROTEIN SYNTHESIS
DNA  mRNA (transcription)
mRNA  polypeptide chain (translation with tRNA)
Why is it three
nucleotides to
make a codon = 1
amino acid?
B.8.5 OUTLINE THE STEPS INVOLVED
IN DNA PROFILING AND STATE ITS
USE
https://www.youtube.com/watch?v=ZxWXCT9wVoI&list=PLxvLFTHItXp
Q1khokrwlQvVPZckHxRwCn
https://www.youtube.com/watch?v=Fz6p8EgJZ3w