? Sheets can participate in the formation of amyloid fibers, which are insoluble protein aggregates. What drives the formation of amyloid fibers?
(a) denaturation of proteins containing ? sheets
(b) extension of ? sheets into much longer ? strands
(c) formation of biofilms by infectious bacteria
(d) ?-sheet stabilization of abnormally folded proteins
(d)
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Which of the following is a trait shared by mammals and reptiles that is not shared by the other groups of chordates?
A. mammary glands B. hair C. lungs D. an amnion E. legs
Most amphibians are completely dependent on an
aquatic environment for a. respiration. b. feeding. c. reproduction. d. respiration and reproduction. e. respiration, reproduction, and feeding.
A positive effect associated with pesticide usage does not include
a. killing disease-causing insects. b. killing some pathogens. c. increasing food supplies. d. increasing profits for farmers. e. causing cancer.
What type of reproduction includes the binary fission used by single-celled bacteria to produce genetically identical daughter cells?
A) sexual reproduction B) asexual reproduction C) fertilization D) condensation