DNA attains a secondary structure when hydrogen bonds form between the nitrogenous bases called purines and pyrimidines. What are the complementary base pairs that form in DNA?
a. A-T and G-C
b. A-U and G-C
c. A-G and T-C
d. A-T and G-U
Answer: a. A-T and G-C
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Bacteriophages replicate in
a. a yeast cell b. bacterial cells c. human cells d. a large virus
Most invertebrates, such as the annelid, have nephridia.
Answer the following statement true (T) or false (F)
Trait SpeciesABCDE101111200111310101401111500001610101The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which trait is least informative of phylogenetic relationships within the group?
A. A B. B C. C D. D E. E