In a large body of standing water, which area exists between the hypolimnion and the epilimnion?
A. Photic
B. Limnetic
C. Profundal
D. Thermocline
E. Littoral
Answer: D
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A recently isolated bacterial strain has been given to you for general characterization of the genome. You begin by isolating the DNA and subjecting it to thermal denaturation. You use Escherichia coli DNA as a reference (A + T = G + C).
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Based on the information in the graph, you can determine that the DNA has a high
A) G-C content with respect to E. coli.
B) pyrimidine content with respect to E. coli.
C) A-T content with respect to E. coli.
D) purine content, with respect to E. coli.
E) none of the above
Bacterial cell walls that are resistant to drying contain
A) carbohydrates. B) amino acids. C) lipopolysaccharide. D) tubulin. E) waxes.
Which of the statements best describes the mutational event pictured below?
Wild-type ACC CAC UCU GGA UUU AAG GCA thr his ser gly leu lys ala Mutant ACC CAC UCU UGA UUU AAG GCA thr his ser stop phe lys ala A. a transversion mutation leading to a nonsense codon B. a frameshift mutation leading to a missense amino acid substitution C. a transition mutation resulting in a silent amino acid substitution D. a transition mutation leading to a nonsense codon E. an insertion mutation resulting in a frameshift of the amino acid sequence
An ________ of a nerve cell is the temporary depolarization and repolarization of the cell membrane.
Fill in the blank(s) with the appropriate word(s).