Which step occurs first during transcription?
a. Free RNA nucleotides are added to an RNA chain.
b. RNA polymerase unwinds DNA.
c. RNA polymerase attaches to the promoter site.
d. The new RNA strand is released from RNA polymerase.
e. The introns are removed from the RNA strand.
c
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The chronic use of the ________ class of drugs can result in decreased effectiveness of antibiotics, anticoagulants, and steroids.
Fill in the blank(s) with the appropriate word(s).
A patient is brought to the hospital after experiencing acute fatigue. The patient’s condition deteriorates rapidly during testing, despite alarmingly high blood glucose levels, and he has no history of diabetes. Initial tests also show low levels of glucose-6-phosphate. The results of further diagnostic testing are not available yet, but based on what you know, which hypothesis could explain the patient’s condition?
a. The patient has a severe phosphate deficiency, preventing phosphorylation of ADP molecules. b. The patient has inherited a mutated form of gene that regulates phosphofructokinase production. c. The patient has been exposed to a substance that binds to hexokinase and inhibits its function. d. The patient has depleted acetyl CoA, which has caused his citric acid cycle to come to a complete stop.
The ________ pathway in lambda phage leads to integration of viral DNA with that of the host, while the ________ pathway leads to induction of progeny viruses
A) lytic, lysogenic B) invasive, replicative C) repressive, inductive D) lysogenic, lytic E) replicative, lysogenic
You are studying a bacterium found in the normal intestinal flora of humans and most other mammals, and are doing an experiment to determine the optimum growth rate of this bacteria. You have inoculated five nutrient broths, and are incubating one broth at each of the following temperatures: 5oC, 25oC, 38oC, 42oC, and 55oC. At which temperature would you predict to see the optimum growth rate?
5oC 25oC 38oC 42oC 55oC