Leucine Zipper Proteins Regulate Transcription By

question 61

Multiple Choice

Leucine zipper proteins regulate transcription by:

• A) forming dimers with zinc finger transcription factors
• B) changing the chromatin structure to heterochromatin
• C) blocking DNA regulatory elements
• D) binding to and activating DNA regulatory elements such as enhancers and silencers
• E) degrading RNA polymerase

---

Definitions:

Organic Molecules

Molecules that contain carbon and are found in living systems.

Fossil Stromatolites

Ancient, layered bio-chemical structures created by the trapping, binding, and calcification of sedimentary grains by microbial mats of microorganisms, especially cyanobacteria, indicative of early life on Earth.

Cells

Basic structural, functional, and biological units of all living organisms, consisting of a nucleus and cytoplasm enclosed in a membrane.

Mesozoic Era

Span of geologic time commonly known as the Age of Reptiles; divided into Triassic (252–201 mya), Jurassic (201–145 mya), and Cretaceous (145–66 mya) periods; ended with the mass extinction of the dinosaurs and many other species.