You prepare the first ever karyotype of an endangered species of frog. Upon examination you find that all the chromosomes are metacentric. This is going to make it difficult to identify
A. which is the p arm of the chromosome.
B. which is the q arm of the chromosome.
C. the unique G banding for each chromosome.
D. if the chromosomes are telocentric.
E. both the p and q arms of the chromosome.
E. both the p and q arms of the chromosome.
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Double fertilization is
A. fertilization of two eggs in the same flower.B. fertilization of an egg by two sperm. C. fertilization of an egg by one sperm and an endosperm-forming cell by another sperm. D. fertilization of two eggs by the same sperm. E. fertilization of an egg and an endosperm-forming cell by the same sperm.
Which structure conducts electrical signals from the apex of the heart to the ventricular myocardium, causing the ventricles to contract?
a. arterioles b. sinoatrial node c. Purkinje fibers d. atrioventricular node
Four of the five answers listed below are
characteristics of cnidarians. Select the EXCEPTION.
a. larvae b. polyp c. gill slits d. medusa e. nematocysts
Ventilation by an individual exercising
strenuously is indicated by a. A. b. B. c. C. d. D. e. E.