Which of the following responses involves the activation of ion channels?
a. Ras pathway activation of microfilament assembly in neutrophils
b. steroid hormone regulation of gene expression
c. Ras pathway activation of genes for cell division
d. peptide-stimulated assembly of microtubule assembly in neutrophils
e. serotonin-stimulated transmission of a neural impulse
E
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Animals in which the anus develops before the mouth in the embryo are
A. coelenterates. B. protostomes. C. deuterostomes. D. coelomic.
Given these parts of the nephron:
1) collecting duct 2) distal convoluted tubule 3) loop of Henle 4) renal corpuscle Which of these sequences represents the correct order through which filtrate would move in the nephron during urine formation? A. 1,2,3,4 B. 1,3,2,4 C. 2,1,4,3 D. 3,4,2,1 E. 4,3,2,1
When the glottis becomes narrower,
A. the volume of sound decreases. B. the volume of sound increases. C. the pitch of sound goes up. D. the pitch of sound goes down. E. all sound ceases completely.
Prior to staining, smears of microorganisms must be heat-fixed in order to ________.
A. allow eventual visualization of internal structures B. ensure removal of dust particles from the slide surface C. create small pores in cells that facilitates binding of stain to cell structures D. attach them firmly to the slide