What are cell exons and introns?
What will be an ideal response
Exons are amino acid-specifying informational sequences in genes. Introns are noncoding gene segments that provide a reservoir of ready-to-use DNA segments for genome evolution and a source of a large variety of RNA molecules.
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In the diagram, what would happen to the concentration of C if the concentration of A increases?
a) increases b) decreases c) no change
The trace element needed as a cofactor for hemoglobin synthesis is
A) zinc. B) copper. C) cobalt. D) iodine. E) silicon.
Which is not an action of interferon?
A. It stimulates macrophages and NK cells to destroy virus-infected cells. B. It triggers synthesis of enzymes that destroy viral nucleic acids. C. It signals the immune system that the secreting cell is part of the body and so should not be attacked. D. It binds to receptors of neighboring cells preventing them from being infected.
In both males and females, gonadotropin secretion by the anterior pituitary is stimulated by:
a. inhibin b. androgens c. GnRH d. FSH e. GHRH