For the yeast galactose metabolizing gene, GAL1, to be transcribed, the regulatory protein produced by the GAL4 gene binds to
A) RNA polymerase.
B) upstream activator sequence G (UASG) region.
C) a ribosome.
D) the operator sequence.
E) the repressor protein.
B
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In addition to oncogenes, changes in what other gene is likely involved in cancer development?
a. proto-oncogenes b. pre-oncogenes c. post-oncogenes d. dys-oncogenes e. tumor suppressor genes
Feathers in birds appear to have first evolved for insulation but later conveyed a new advantage in helping create light aerodynamic surfaces. the switch in function is an example of a(n) ____________.
A. Paedomorphosis B. An analogy C. Exaptation D. An adaptation
Which cells make up the bulk of the soft primary growth of roots, stems, leaves, flowers, and fruits?
a. parenchyma cells b. sclerenchyma cells c. collenchyma cells d. vessel members cells
The protozoan that causes malaria is an intracellular parasite of red blood cells (RBCs). An adaptive immune response to this parasite is problematic because
A) red blood cells do not produce MHC and, therefore, do not display the fact that they have been infected by presenting antigen. B) the parasite damages leukocytes along with RBCs. C) RBCs normally produce cytokines necessary for adaptive immune response, which this infection prevents. D) complement cannot effectively destroy RBCs. E) RBCs never enter lymphoid tissue.