To prevent the overgrowth of cyanobacteria and algae in water reservoirs, the water is often treated with
A. antibiotics.
B. lactic acid.
C. copper sulfate.
D. propionic acid.
E. iodine.
Answer: C
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"Gluconeogenesis" is the process in which
A. glucose levels are increased in the blood through the breakdown of carbohydrates. B. glucose levels are decreased in the blood through the breakdown of carbohydrates. C. glucose levels are increased in the blood by synthesis of glucose from non-carbohydrate sources. D. glucose levels are decreased in the blood by synthesis of glucose from non-carbohydrate sources. E. amino acids are generated for processes like building muscle tissue.
What is the difference between chemical evolution and biological evolution?
What will be an ideal response?
Consider a mutant organism that is unable to make the amino acid arginine. Knowing that the
metabolic pathway to production of arginine is ornithine ? citrulline ? arginosuccinate ? arginine, you test the ability of the mutant to grow in the presence of each one of these compounds, providing just one of the compounds in each of your tests. You find that the mutant can grow in the presence of arginosuccinate or arginine, but not in the presence of citrulline or ornithine. From this you can conclude that the product of the gene mutated in the mutant is most directly involved in production of ____.
a. arginine from ornithine b. arginosuccinate from citrulline c. citrulline from ornithine d. arginine from arginosuccinate e. arginosuccinate from ornithine
What is RNA interference?
A. When an RNA virus blocks the DNA replication of the host cell. B. When tRNA attaches to the ribosome and blocks its movement along the mRNA. C. When small RNAs form double-stranded RNA molecules that can regulate gene expression. D. When proteins block the transcription of DNA in the nucleus.