Although most genetic sequence information is obtained from living species, it is sometimes possible to obtain DNA from small tissue samples of extinct species for use in constructing phylogenetic trees.
Answer the following statement true (T) or false (F)
True
In some cases, DNA can be extracted from tissues that are between 50,000 and 100,000 years old, allowing scientists to gain new information about the evolutionary relationships among living and extinct species.
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Exoskeletons are used for movement by which of the following animals?
A. insects B. cnidarians C. crustaceans D. humans E. insects and crustaceans
Activators
A. are involved in negative control. B. are involved in positive control. C. always bind to the promoter. D. are allosteric proteins. E. are involved in positive control AND are allosteric proteins.
Self-cleaving RNAs that function catalytically are called
A) snRNPs. B) snRNAs. C) ribozymes. D) ribosomes. E) spliceosomes.
Which of the following pairs is mismatched?
A) trichomoniasis — fungus B) gonorrhea — gram-negative cocci C) chancroid — gram-negative rod D) Gardnerella — clue cells E) syphilis — gram-negative spirochete