Question

Which of the following describes a zinc finger?

-two cysteines and two histidines coordinated by a single zinc ion
- a single long helix with a basic region on one end that specifically recognizes DNA and a leucine zipper on the other used for dimerization
- bimetal cluster coordinated by 6 cysteines
- a triple helical cluster often stabilized by a beta sheet

Answer 1

A zinc finger is a domain needed for a receptor to activate gene promoters, and it is characterized by two cysteines and two histidines coordinated by a single zinc ion.

Step-by-step explanation:

A zinc finger is a domain needed for a receptor to activate the promoters of the genes being controlled. It consists of two cysteines and two histidines coordinated by a single zinc ion. This zinc finger domain is responsible for binding the specific DNA sequence known as the response element.