Archaea are resistant to damage by harsh conditions because their membrane lipids, unlike those of Bacteria and Eukaryota, have:
A. ether linkages
B. proton pumps
C. sulfhydryl linkages
D. transferases
E. cytoskeletons
A. ether linkages
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To process information, postsynaptic neurons often add up simultaneous signals from several presynaptic neurons. Which structure and process allow them to do so? A. axons; temporal summation
A. axons; temporal summation B. axons; spatial summation C. dendrites; temporal summation D. dendrites; spatial summation
Atrial natriuretic peptide has been found to:
a. decrease sodium secretion and increase blood pressure. b. constrict afferent arterioles, decreasing the glomerular filtration rate. c. be produced by the adrenal cortex. d. inhibit sodium reabsorption by the collecting ducts by inhibiting secretion of aldosterone. e. increase the release of renin from the juxtaglomerular apparatus
Which of the following does NOT affect the rate of diffusion?
a) solvent density b) temperature c) mass of the molecule diffusing d) extent of the concentration gradient e) all of these affect the rate of diffusion
Which of the following statements regarding fungi is false?
A) Fungi are important decomposers in ecosystems. B) Fungi can break down only plant material. C) The distinctive flavor of certain cheeses is due to fungi. D) The first antibiotic discovered came from a fungus.