Question 1

Which level of protein structure is depicted in the first image (multicolored, multiple chains with labeled N and C termini)?

Accepted Answer

Quaternary structure

Question 2

The second image shows a sequence of amino acids connected in a linear fashion. Which level of protein structure does this represent?

Accepted Answer

Primary structure

Question 3

The third image shows a protein with several arrows indicating beta strands. What type of secondary structure is primarily shown?

Accepted Answer

Beta sheet

Question 4

The fourth image shows a single polypeptide chain folded into a compact structure. Which level of protein structure is this?

Accepted Answer

Tertiary structure

Question 5

The sixth image shows a yellow helical protein with a red group inside. This protein is most likely:

Accepted Answer

Myoglobin

Question 6

The seventh image shows a protein with four different colored subunits, each with a heme group. Which protein is this?

Accepted Answer

Hemoglobin

Question 7

The ninth image shows a protein with two yellow and two blue chains, each containing a heme group. What is the function of this protein?

Accepted Answer

Transporting oxygen in the blood

Question 8

The tenth image shows a protein with a pocket for oxygen and a heme group. Which protein is this, and where is it found?

Accepted Answer

Myoglobin, found in muscle tissue

Question 9

The thirteenth image shows a graph comparing oxygen binding of myoglobin and hemoglobin. Which protein has a higher affinity for oxygen at low pO2?

Accepted Answer

Myoglobin

Question 10

The fifteenth image shows a protein with labeled alpha and beta chains and heme groups. What type of protein structure is this?

Accepted Answer

Quaternary structure

Question 11

The sixteenth image shows a close-up of a hydrophobic pocket with Val 6. This mutation is associated with which disease?

Accepted Answer

Sickle cell anemia

Question 12

The nineteenth image shows sickle-shaped red blood cells. What causes this abnormal shape?

Accepted Answer

A mutation from glutamic acid to valine in hemoglobin

Question 13

The twentieth image shows an electrophoresis setup. What property of proteins does this technique primarily separate?

Accepted Answer

Charge and molecular weight

Question 14

The twenty-first image shows the results of electrophoresis for normal, sickle-cell anemia, and sickle-cell trait hemoglobin. Why does normal hemoglobin migrate further toward the anode?

Accepted Answer

It has a more negative charge due to glutamic acid

Question 15

The twenty-fourth image shows a protein with a high content of alpha helices and a heme group. Which protein is this, and what is its main function?

Accepted Answer

Myoglobin; oxygen storage in muscle

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