The upper, unconfined portion of the groundwater constitutes the ____, which flows into streams and is partly accessible to plants.
A. aquifer
B. hydrozone
C. water table
D. watershed
C. water table
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Suppose a scientist working on a new drug for cancer developed a chemical that irreversibly breaks the hydrogen bonds in the DNA molecules within cancerous cells but leaves all of the covalent bonds intact
Hydrogen bonds are relatively weak compared to covalent bonds, and they are routinely broken and reformed as the DNA molecule is replicated in a normal cell. Their stability is nonetheless critical for maintaining certain aspects of the structure and function of the DNA molecule. Based on this scenario and your knowledge of DNA, how would this newly discovered chemical affect the "molecule of heredity" in a human cancer cell? A) It would break the individual strands of the DNA molecule apart, preventing it from functioning normally. B) It would result in constant DNA replication within the cell. C) It would break the two strands of the DNA molecule apart, preventing it from functioning normally. D) It would allow the DNA molecule to function normally except during replication.
The oxygen consuming property of a wastewater sample is designated by the term
A. lagooning. B. stabilization. C. activation. D. biochemical oxygen demand.
A hole in the inner mitochondrial membrane means that there is a(n) __________ in the
concentration gradient of H+ ions.
a. increase b. decrease
What protein produces bioluminescence?
a. Luciferin b. Photophorin c. Luciferase d. Photophorase