Differentiating cells delete the DNA for genes they do not need
A. true
B. false
B
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Imagine that you are studying the control of ?-globin gene expression in immature red blood cells . (Mature red blood cells contain ?-globin protein but lack a nucleus and, therefore, the ?-globin gene.)
If you deleted a sequence of DNA outside the protein-coding region of the ?-globin gene and found that this increased the rate of transcription, the deleted sequence likely functions as _____. A) a promoter B) a promoter-proximal element C) an enhancer D) a silencer E) any of the listed functions
There is no correlation between genome size and complexity of an organism
A. true B. false
Locations where molten rock rupture a tectonic plate are called:
a. hot spots b. faults c. ridges d. weak spots e. trenches
The area labeled "C" in the accompanying figure is ____
a. a nucleus b. chromatin c. the nuclear membrane d. a vacuole e. a nucleolus