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4. Assume that the unknown amino acid that you analyzed was not one of the 5 known amino acids on your chromatogram (Leu, Ala, Phe, Asp, Ser), but instead was one of the other 15 amino acids. Based on its Rf, what is the most likely identity of your unknown. Justify your conclusion.

5. If you boil an protein in hydrochloric acid it will break down to its constituent amino acids. Assume that you had done this to a typical protein and then had spotted these amino acids to a spot on the chromatograph. What pattern would you expect to see at the end of the experiment? Explain your prediction.

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Nestor Rutherford
Nestor RutherfordLv2
28 Sep 2019

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Related questions

Answer the following questions concerning the polypeptides whose amino acid sequences are shown below. Explain your reasoning for all.

A) Gly-Ile-Trp-Leu-Ile-Ile-Phe-Gly-Val-Val-Ala-Gly-Val-Ile-Gly-Trp-Ile-Leu-Leu-Leu

B) Gly-Pro-Asp-Gly-Pro-Met-Gly-Pro-Ser-Gly-Pro-Arg-Gly-Pro-Glu-Gly-Pro-Asp-Gly

C) Gly-Met-Trp-Pro-Glu-Met-Cys-Gly-Glu-Pro-Ala-His-Val-Arg-Asp-Tyr-Pro-Leu-Leu

D) Gly-Met-Trp-Pro-Glu-Met-Cys-Gly-Glu-Pro-Ala-His-Val-Arg-Asp-Tyr-Cys-Leu-Leu

1. Which would be most likely to form an a-helical structure?

2. Which could have at least one disulfide bond?

3. Suppose that the first amino acid residue in peptide (1) were altered from Gly to Pro. Would you expect this change to have an effect on the secondary structure of this peptide? Why or why not?

Which of the following is NOT a direct consequence of the fact that DNA polymerase can only build onto the end of an existing nucleic acid?

Question 6 options:

DNA replication requires primers

Bits of DNA are lost from the ends of your chromosomes in each successive round of replication

RNA is involved in DNA replication

The enzyme "primase" is needed for DNA replication

There are multiple origins of replication on each eukaryotic chromosome

How does a nucleotide sequence code for a protein in nearly all living organisms?

Question 7 options:

a sequence of 3 nucleotides can code for one of 64 different amino acids

a sequence of 2 nucleotides can code for one of 64 different amino acids

a sequence of 2 nucleotides can code for one of 20 different amino acids

a sequence of 3 nucleotides can code for one of 20 different amino acids

a sequence of 3 nucleotides can code for 3 different amino acids

Fill in the blanks. To make one strand of DNA, _________ monomers are linked together in a chain, forming a polymer we call a(n) ________ .

Question 8 options:

nitrogenous bases, hydrogen bond

nucleotide, nucleic acid

amino acid, nucleic acid

nucleotide, nitrogenous base

amino acid, protein

Which of the following was NOT part of the ideas that Darwin used in his book On the Origin of Species?

Question 9 options:

organisms vary in characteristics that affect survival and reproduction

variation in traits is often heritable

descent with modification explains life's unity and life's diversity

organisms inherit characteristics from their parents that the parents acquired in their own lifetimes

natural selection is a cause of adaptive evolution

Here is a hypothetical mRNA sequence:

5' G G A U G C U A G U A U G A 3'

What is the amino acid sequence encoded by this mRNA?

Question 10 options:

Met-Ile-Val

Asp-Ala-Ser-Met

Met-Leu-Val

Ser-Met-Ile-Val

Gly-Cys

4. Elastin, a muscle fiber protein, can assemble into fibers and disassemble depending on temperature. It assembles at higher temperatures and disassembles at lower temperatures. At higher temperatures, the change in free energy for the reaction, elastin --> elastin fibers, is negative for the reaction to proceed. Conversely, the free energy is positive at lower temperatures to allow for elastin fiber disassembly. Decide what the signs of the change in enthalpy and the change in entropy need to be. Explain how your choices account for the assembly of elastin at high temperature and its disassembly at low temperature. Assume that the change in enthalpy and the change in entropy are constant over this temperature range.

3. Consider the following protein sequence as an α helix: Leu-Lys-Arg-Ile-Val-Asp-Ile-LeuSer-Arg-Leu-Phe-Lys-Val. How many turns does this helix make? Do you notice anything interesting about the arrangement of the amino acids when folded into an α helix? Explain.

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