A bacteria sample is taken from the immediate vicinity of a hydrothermal vent. You would expect for it to most likely contain
a. diatoms.
b. hyperthermophiles.
c. lignicolous fungi.
d. cyanobacteria.
B
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Enumerating cells in a biofilm is especially challenging for
A) microscopic direct counting. B) measuring turbidity. C) viability counts with spread plating. D) microscopic direct county, measuring turbidity, and viability counts with spread plating.
What did comparing the sequence of the mitochondrial genome in trypanosomes with the sequence of mature mitochondrial RNAs demonstrate?
A) The RNA sequences are similar to the genome sequence, but have insertions and deletions of uracil residues. B) The RNA sequences align perfectly with the genomic DNA from which it is transcribed. C) All of the proteins necessary for translation are encoded in the mitochondrial genome. D) Translation is initiated in mitochondria only at AUG codons. E) Some mature RNAs do not have start and stop codons.
Which of the following is true of the integration of a viral genome into the host chromosome?
A. Integration begins the process of host chromosome degradation. B. The enzymes that are used in integration are nonspecific for the virus and its host. C. Integration of the viral genome is a form of site-specific recombination. D. All of the choices are correct.
Consider the thermodynamic properties of chemical reactions. Even though enzymes do not affect the overall energy of the reactants or the products ( the thermodynamics), they alter the speed of the reaction. Enzymes accomplish this by doing which of the following?
A.) increasing the activation energy of a reaction B.) not altering the activation energy of a reaction C.) reducing the activation energy of a reaction D.) eliminating the activation energy of a reaction E.) supplying the activation energy for a reaction