Question

Biological macromolecules such as proteins may be positively, negatively, or neutrally charged depending on what amino...

Biological macromolecules such as proteins may be positively, negatively, or neutrally charged depending on what amino acids are present. Some parts of a macromolecule may be positively charged while others are negatively charged, and this can affect the conformation – the shape of the macromolecule. Changes in the conformation may affect the function of a macromolecule. Two charged macromolecules (labelled 1 and 2) have charges q1 =+3.20 × 10-19 C and q2 =+12.8 × 10-19 C. They are separated by a distance of 60 nm.

a. How many elementary charges are missing from each macromolecule? Explain your reasoning.

b. What is the magnitude of the electrostatic force on macromolecule 1 from macromolecule 2?

c. Draw a diagram showing the direction of the force on macromolecule 1 due to macromolecule 2. Explain why the force is in the direction you determined.

d. Draw a diagram showing the electric field surrounding these charged macromolecules. Make sure to include arrows indicating the direction of the field.

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