The fluid mosaic model of cell membranes was proposed by
a. Frye and Edidin.
b. Singer and Nicolson.
c. Gorter and Grendel.
d. Avery and McLeod.
Ans: b. Singer and Nicolson.
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Yearly vaccination of humans for influenza viruses is necessary because _____
A) of an increase in immunodeficiency diseases B) the flu can generate anaphylactic shock C) surviving the flu one year exhausts the immune system to nonresponsiveness the second year D) rapid mutation in flu viruses alters the surface proteins in infected host cells E) flu leads to autoimmune disorders
Ribozymes are ________.
A. catalysts for DNA splicing B. catalysts for RNA splicing C. unique to eukaryotes D. ribosomes which catalyze reactions E. unique to prokaryotes
The state of Texas passed a law to require
a. AED devices at all high school sporting events. b. AED training for all teachers in the state. c. CPR training for all parents of high school athletes. d. all AED’s to be tested on an animal prior to use in humans. e. none of these.
Renin is produced by cells in the ____
a. glomerulus b. Bowman’s capsule c. juxtaglomerular apparatus d. efferent arteriole e. peritubular capillaries