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Near the end of a marathon race, the first two runners are separated by a distance of 35.0 m. The front runner has a velocity of 3.25 m/s, and the second runner has a velocity of 4.75 m/s. What is the velocity of the front runner relative to the second runner?  

A peptide with 200 amino acids contains

You treat a partially purified preparation of protein with a reagent that breaks bonds between sulfur atoms. Which level(s) of protein structure is/are most likely to be affected? (Select all that apply).

A buffer has all of the following characteristics EXCEPT:

In what direction is an mRNA molecule synthesized?

Examine the structures of cholesterol, testosterone and estrogen shown below. If we know that cholesterol is the precursor for synthesizing the other sex hormones, which of the statements below is likely to be CORRECT?

RNA and DNA NEVER differ in the functional groups attached to: (Select all that apply)

Why are free ionic bonds of little relevance and relatively unlikely to form in living organisms?   Cells are composed mostly of water, which interferes with ionic bonds between free ions. Cells are largely hydrophobic and exclude ions. Cells incorporate ions into larger molecules and prevent the formation of ionic bonds.

A pH shift from 4 to 7 creates a solution which is

The image shown below displays amino acid side chains (shown in sticks) represented as numbers. Choose the statement(s) below that is/are correct. Serine is represented by label 3. Tryptophan is represented by label 2. Alanine is represented by label 4. Cysteine is represented by label 7. Disulfide bonds formed by two cysteine residues are represented by label 5.