Which of the following is the best evidence for the lock and key hypothesis of enzyme action?
A. All isolated enzymes have been identified as proteins.
B. Enzymes determine the direction of a reaction.
C. Enzymes are found in living organisms and speed up certain reactions.
D. Compound similar in structure to the substrate inhibits the reaction
Answer: D. Compound similar in structure to the substrate inhibits the reaction
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Deinococcus radioduransis (select all that apply):
A. resistant to ionizing radiation. B. able to repair DNA breaks without ATP. C. killed via desiccation. D. unique in its ability to withstand ionizing radiation. E. adapted to withstand the desert environment.
How does diffusion limit size in cells?
a. Once a cell attains a particular size, the transport proteins in the cell membrane stop functioning and diffusion fails. b. The size of the cell dictates the size of lipids in the membrane. If the lipids become too large, diffusion becomes slower and the cells can starve. c. As cells increase in size, the surface-to-volume ratio decreases and diffusion becomes too inefficient to provide nutrients and waste disposal from the cell. d. Cells that are of a particular size, or greater, enter a state of torpor and growth slows until the cell shrinks again.
Which of the following statement is true about helicase?
A. Helicase adds nucleotides to DNA B. Helicase unzips DNA C. All of the above D. Helicase transcribes RNA
The opportunistic pathogen ________ is metabolically and morphologically distinctive from other fungi and is not effectively treated with antifungal medications.
A. Candida albicans B. Blastomyces dermatitidis C. Aspergillus D. Microsporum E. Pneumocystis jirovecii