DNA is constructed of
A) a single strand of nucleotides with internal hydrogen bonding.
B) two complementary strands of nucleotides bonded A—C and G—T.
C) two strands of nucleotides running in an antiparallel configuration.
D) two strands of identical nucleotides in a parallel configuration with hydrogen bonds between them.
E) None of the answers is correct.
C
You might also like to view...
If two continents converge and are united, then the collision should cause
A. a net loss of intertidal zone and coastal habitat. B. the extinction of any species adapted to intertidal and coastal habitats. C. a decrease in climatic extremes in the interior of the new supercontinent. D. an overall decrease in the surface area located in the continental interior.
The evolution of saber teeth in a number of groups of extinct carnivorous mammals is an example of
A. homoplasy caused by common descent. B. homoplasy caused by convergence. C. homology caused by common descent. D. homoplasy caused by evolutionary reversal. E. homology caused by convergence.
Sex pilus(i) is/are
A. similar to fimbria(e) B. proteins that form the outermost cell envelope of broad spectrum of bacteria C. specialized appendage(s) that binds mating prokaryotes together for DNA transfer D. specialized appendage(s) that are found only on gram-positive bacteria
Laboratory strains of E. coli are desirable hosts because
A. it is easy to grow. B. its genetics is well known. C. it is especially able to express foreign genes. D. it has known phenotypic characteristics. E. All of the choices are correct.