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
Answer: D
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Supercoiling is important for DNA structure, because
A) it holds together the antiparallel strands of DNA in the double helix. B) it provides energy for transcription. C) it condenses the DNA so that it can fit inside the cell. D) it prevents RNA from pairing with DNA in the double helix.
Pharmacogenomics is the study of ____
a. DNA mutations that decrease well-being b. genes that make an organism prone to certain diseases c. disease resistance genes in an organism’s genome d. the antibiotic resistance genes in an organism’s genome e. the ways in which genes affect an individual’s response to drug therapy
___ allow pythons to detect their prey
a. Mechanoreceptors b. Chemoreceptors c. Thermoreceptors d. Photoreceptors e. Proprioreceptors
Which enzyme is responsible for adding complementary DNA bases to an exposed DNA strand?
A) DNA helicase B) DNA polymerase C) DNA ligase D) DNA peptidase