Final answer:
The length of a 65kDa single stranded alpha helical is not provided. The length of the helix can be calculated by multiplying the distance between each turn by the number of turns.
Step-by-step explanation:
The length of a 65kDa (kiloDalton) single stranded alpha helical is not provided in the given information. The information provided only mentions the distance between each turn of a helix (5.4 Å) and the number of amino acids per turn (3.6). However, we can calculate the length of the helix by multiplying the distance between each turn (5.4 Å) by the number of turns.
For example, if we assume the helix has 10 turns, the length of the helix would be 5.4 Å x 10 turns = 54 Å.
It's important to note that the length of the helix in a biological context may vary depending on the specific protein or nucleic acid structure being referred to.