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Rifamycin and actinomycin D are two antibiotics derived from the bacterium Streptomyces. Rifamycin binds to the b subunit of E. coli RNA polymerase and interferes with the formation of the first phosphodiester bond in the RNA chain. Actinomycin D bind to double stranded DNA by intercalation (slipping in between neighboring […]

1) Explain how a metabolic pathway can contain an energetically unfavorable reaction yet still occur. 2) What general factors contribute to the high phosphoryl-transfer potential of ATP? 3) Compare ATP to acetyl CoA. 4) What is the relationship between the energy charge of a cell and control of the ATP-generating […]

1. Alice, a 16 year old girl, dislikes seafood right from her childhood. This enduring dislike for seafood is an attitude that she cultured from her mother. Which of the following is the attitude object in this case? a. Alice’s mother b. Alice c. Seafood d. Alice’s childhood 2. Patrick […]

In an experimental situation, a student researcher inserts an mRNA molecule into the cytoplasm of a eukaryotic cell after she has removed its 5′ cap and poly-A tail. Which of the following would you expect her to find?a) The mRNA attaches to a ribosome and is translated, but more slowly.b) […]