Some regions of a polypeptide may coil or fold back on themselves. This is called _____, and the coils or folds are held in place by _____.
A. secondary structure ... hydrogen bonds
B. secondary structure ... peptide bonds
C. tertiary structure ... hydrogen bonds
D. primary structure ... covalent bonds
E. tertiary structure ... covalent bonds
Ans: A. secondary structure ... hydrogen bonds
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A. the lacI coding region. B. the promoter. C. the operator. D. the lacZ coding sequence. E. the lacY coding sequence.
Stromatolites are
A. layered rocklike structures formed by some cyanobacteria (blue-green algae). B. the earliest known arthropods. C. found only in rocks of Carboniferous age. D. the earliest known arthropods and found only in rocks of Carboniferous age are correct. E. fossilized coral reefs.
Threadlike and bloblike structures containing DNA and other organic molecules enclosed in a
membrane are a. protocells. b. nanobots. c. nanobes. d. chimera. e. blebs.
________ is the farming of a variety of shellfish, crustaceans, finfish, and algae
A) Aquaculture B) Tissue culture C) Organ culture D) Mariculture E) Protoplast culture