How many bases does it take to code for a single amino acid?
A) four B) six C) two D) three E) one
Answer: D
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Because most herbivores do not produce cellulase, they have specialized compartments in their digestive tracts that (select all correct choices):
A. provide appropriate temperature and pH for breaking down plant material. B. house large populations of bacteria and other single-celled symbionts that do produce cellulase. C. grind up the plant material using muscular gizzards or other structures. D. secrete alternative enzymes that carry out the same function as cellulase. E. ferment nutrients in the hindgut.
Which of the characteristics of the malaria parasite Plasmodium listed below reflect the evolution of mechanisms to evade the immune system? Select all correct answer options
A. The fact that the malaria parasite is a eukaryote. B. The fact that infected cells remain in the blood vessels and out of the spleen because the malaria parasite expresses a sticky protein in its plasma membrane. C. The fact that the malaria parasite has a nucleus and membrane-bound organelles. D. The fact that the malaria parasite produces proteins. E. The fact that the malaria parasite shows antigenic variation in its cell surface proteins.
Phase 1 of the creation of life on earth was _____________________. Phase 2 was the formation of self-replicating, information containing molecules. Phase 3 was the development of a membrane, enabling metabolism and creating the first cells.
a) the formation of RNA b) the formation of small molecules containing carbon and hydrogen c) the formation of DNA d) the increase in the amount of atmospheric oxygen. e) the formation of membranes so that later cells could develop
The mechanism by which the information contained in DNA is coded into a complementary RNA copy is called:
a. translation. b. the one gene-one enzyme hypothesis. c. replication. d. transcription. e. the central dogma.