In a typical "bacterial growth curve", identify the phase in which the majority of bacterial cells acclimate to the environment:
A. The lag phase
B. The log/exponential phase
C. The stationary phase
D. The death phase
Ans: A. The lag phase
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A patient presenting a variety of symptoms, including generalized fatigue and neurological impairment, is brought to the hospital, where tests reveal a severe GTP deficiency in the patient’s liver. What is the likely cause of these symptoms?
a. The patient’s cells produce an overabundance of isocitrate, inhibiting GTP production. b. The patient’s diet contains insufficient quantities of alpha-ketoglutarate. c. The patient has a mutated form of the enzyme that regulates succinate synthesis. d. A fat-rich diet caused cholesterol to bond to GTP-precursors, inhibiting GTP production.
How many proteins appear to be related to the differences in shell color?
a. 1 b. 2 c. 3 d. 4
In omnivores, including humans, the cecum is an important organ for digestion of cellulose.
Answer the following statement true (T) or false (F)
A strain of mutant bacteria has been isolated. You isolate the mRNA corresponding to the mutated gene from this bacterial strain to use in an in vitro translation system and note that even in vitro it is difficult to use this message and obtain protein
Of the following, which is a likely explanation for these results? A) There may be a mutation in the Shine–Dalgarno sequence of the DNA, resulting in mRNA that binds poorly to the ribosome. B) There may be a mutation in the ribosomal rRNA recognizing the Shine–Dalgarno sequence of the message. C) This mutant may have altered tRNA molecules, such that the codon–anticodon interaction during translation is affected. D) This mutant may not manufacture enough translation factors for effective translation. E) In this mutant, the ribosomal subunits may not associate well enough for effective translation.