The two types of secondary structure interactions are referred to as:
A. primary and secondary.
B. amide and carbonyl.
C. residual and permanent.
D. -helix and -sheet.
E. sulfhydryl and phosphatidic.
Answer: D
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The different DNA configurations that are generated by super coiling are called topoisomers of one another
Indicate whether the statement is true or false
Gas exchange in all living organisms requires
A. gills B. lungs C. tracheoles D. moist membranes E. blood
Mammals and birds can produce urine that is ____________, such that wastes are excreted in a small volume of water.
A. isotonic B. hypertonic C. hypotonic D. all of the above
Bacteria called Mycoplasma lack a cell wall. Their cell membrane is stabilized by ____________ and is resistant to lysis.
A) testosterone B) sterols C) teichoic acid D) porin