In eukaryotes, pre-mRNA processing may involve all of the following except
A. addition of a 3' poly-A tail
B. removal of exons from the pre-mRNA.
C. addition of a 5' cap.
D. pre-mRNA splicing by the spliceosome.
Answer: B
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Consider the following reaction at equilibrium: What would be the effect of adding additional H2CO3?
A) It would drive the equilibrium dynamics to the right. B) It would drive the equilibrium dynamics to the left. C) Nothing would happen, because the reactants and products are in equilibrium. D) The amounts of CO2 and H2O would decrease.
Which of the following did Nam-Hai Chua and his colleagues demonstrate to be part of the abscisic
acid response pathway?
a. cyclic ADP-ribose b. Ca2+ c. protein kinases d. cyclic ADP-ribose and protein kinases e. cyclic ADP-ribose, Ca2+ and protein kinases
The ________ is the selective barrier of a root that determines which substances pass between the cortex and vascular tissue
A) epidermis B) endodermis C) cuticle D) xylem
Rheumatic fever is a sequalae of repeated infection with streptococcus pyogenes. The pathogenesis involved in this complication is
A. Antigen-antibody complex precipitation on the valves of the heart B. Molecular mimicry in which some of the bacterial proteins resembles those of endocardium C. An immunological response to a specific Protein A D. An immunological response in the antigen determining the Lancefield classification of the bacterium