Bicoid protein is a transcription factor that promotes transcription of the hunchback gene. This is an example of:
A. translational control of gene expression
during development.
B. translational control of development.
C. hierarchical control of gene regulation
during development.
D. maternal developmental effect.
E. oocyte polarization.
C
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What is the role of opsonins?
a. They attract phagocytes to the location of infection. b. They create "handles" that make it easier for the pseudopods of phagocytes to attach to the microbe invader. c. They aid in the formation of the phagolysosome. d. They are present on the surface of phagocytes.
The maltose operon contains genes that code for proteins that catabolize the disaccharide maltose. Similar to the Lac operon, which is only efficiently transcribed in the presence of lactose, the maltose operon is only efficiently transcribed in the presence of maltose. How might induction of the maltose operon in response to maltose be achieved?
A. Maltose causes an activator to bind an operon with an inefficient promoter. B. Maltose removes an activator from an operon with an inefficient promoter. C. Maltose causes a repressor to bind an operon with an efficient promoter. D. Maltose removes a repressor from an operon with an efficient promoter. E. Maltose causes an activator to bind an operon with an efficient promoter.
An aneurysm is a weakening of the walls of a blood vessel. Which of the following blood vessels would be most likely to break open if an aneurysm is present?
A) capillary B) venule C) artery D) lymph duct
The major categories of hypersensitivities that typically involve a B-cell immunoglobulin response is/are
A. Type 1 only. B. Type 4 only. C. Type 1, Type 2, Type 3. D. Type 1 and Type 4. E. Type 1, Type 2, Type 3, and Type 4.