The brain can infer the pitch of a sound from the:a
number of hair cells that are stimulated.
b. particular hair cells that are stimulated.
c. intensity with which the hair cells are stimulated.
d. intensity of the action potential produced by the stimulated hair cells.
e. fluid movements of the semicircular canals.
B
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You are working in a Drosophila lab, and find a larva with two anterior ends. Both a normal larva and the mutant larva are shown below. What is the most likely explanation for the mutant larva phenotype?
A. There is a mutation in the bicoid gene causing no functional Bicoid protein to be made.
B. The nurse cells that produce the Bicoid protein are defective, so there is no protein at either end of the embryo.
C. There is a mutation in a homeotic gene.
D. There is a high concentration of the Bicoid protein at both ends of the mutant embryo.
E. A protein encoded by a segment polarity gene is not degraded correctly and accumulates in both ends of the embryo.
A small mass of tissue with many lymphocytes that filters lymph is the:
a. thymus b. SA node c. spleen d. lymph node e. lymphatic duct
Sequencing the dog genome is currently a high priority for genomics researchers. What insights do you think can be gained about the evolutionary process by analyzing the genome of dogs?
What will be an ideal response?
In a signal transduction pathway involving cAMP as a second messenger, after a G protein is activated, the activated
G protein then activates:a. phospholipase C. b. adenylyl cyclase. c. calmodulin. d. protein kinase. e. diacylglycerol.