chapter 1: intro to biochemistry

Chapter 1: Intro to Biochemistry

C483 Spring 2013

Questions1. T/F The Golgi apparatus consists of flattened, fluid-filled, membranous sacs and is

responsible for chemical modification and sorting of some biomolecules.

2. T/F The endoplasmic reticulum is the major site of RNA synthesis and the site of assembly of ribosomes.

3. Which functional group is shown?A) Primary amine.B) Acyl.C) Amide.D) Anhydride.E) Nitrile.

4. Which is NOT a proper way to form a hydrogen bond? (The symbol "R" represents a general organic group. The hydrogen bonding is represented by dashed lines.)

5. The aggregation of nonpolar molecules or groups in water is thermodynamically due to the A) increased entropy of the nonpolar molecules when they associate. B) decreased enthalpy of the system. C) increased entropy of the water molecules. D) very strong van der Waals forces among the nonpolar molecules or groups.

6. Cells keep the osmotic pressure from being too great by A) existing in hypertonic solutions. B) making macromolecules from smaller molecules. C) existing in a hypotonic solution. D) existing in an isotonic solution. E) Both B and D.

Biological Chemistry

• Cartoon picture of a virus

• Nucleic acid wrapped in protein shell

• Structural biology• Biochemistry• Chemical biology

We will study a coronavirus in discussion section

On the atomic level

Major Topics

Organic Chemistry Review:Section 1.2

Biology Review: Sections 1.8-1.9

Know functions of organelles Be able to describe cytosol

Chapter 2: WATER

• Properties of water based on H-bonding– Density– Specific heat– Heat of vaporization

Water Solubility

• Solvation of particles based on intermolecular interactions– Polar molecules– Ionic substances

Solution Chemistry

• Diffusion • Osmotic Pressure

How does formation of glycogen affect osmotic pressure?

Water and Nonpolar Compounds

• Nonpolar compounds do not dissolve in water—they aggregate to minimize surface area

• Hydrophobic effect• Driven by minimization of ordering of water

(increases the entropy of solution)

In Discussion Section

• Section 2.5• Electrostatic

interactions– Charge-charge– Hydrogen bonding– Van der Waals

• Section 1.4, 2.6• Energetics of reactions

of water– Condensation vs.

hydrolysis– Thermodynamic stability– Kinetci stability

Answers to Questions

1. T2. F3. C4. II5. C6. E