Question

Three of the alpha helices are labeled by a numbered bracket. Which numbered helix. Would be designated as the "A helix" by the common naming system? (Image 1)

Click on the segment that is designated as the FG segment, also called the FG bend, in the hemoglobin beta subunit (Image 2).

Click on the approximate location of residue HC3 in the hemoglobin Beta subunit (Image 3).

The image shows the structure of the β subunit of hemoglobin including the heme group and eight α helices. A common naming system for myoglobin and hemoglobin subunits assigns a letter (A-H) to each of the eight helices beginning at the amino terminus Amino terminus Three of the α helices are labeled by a numbered bracket. Which numbered helix would be designated as the "A helix" by the common naming system? O helix 1 O helix 2 C helix 3 O none of the above Scroll down to complete

Answer 1

1) From the given data, Amino termi The numbering usually proceeds from A to H from N-terminal, so the helix-2 is the initial helix, which exists too close to the N-terminal, so it should be "A." Then helix-1 should be represented as "B" and helix-3 should be represented as "C." Thus, the correct option is Helix-2 helix 2 2) The unstructured segment of the hemoglobin ß-subunit is as follows G helix Click here F helix Carboxy terminus

3) The HC3 position is as follows H helix Click here