Why is gas exchange in an aquatic environment more challenging than gas exchange in the air?
A) Gills have a poor blood supply.
B) Carbon dioxide is eliminated by active transport in an aquatic environment.
C) Less oxygen is available in water than in air.
D) The countercurrent exchange process limits the amount of oxygen that can be extracted from water.
E) The large surface area of gills makes them more susceptible to drying out.
C
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A transposable element composed of an antibiotic resistance gene, a recombinase gene, and inverted repeats is identified in a bacterial genome. This element can be any of the following except
A. an integrated conjugative element. B. a composite transposon. C. an insertion sequence. D. a unit transposon.
List three characteristics that malignant cells have
What will be an ideal response?
Which of the following contributes to the stability of the DNA double helix?
A) hydrophobic interactions between aromatic bases at the center of the double helix B) hydrogen bonding between the phosphate and sugar groups in the backbone of the double helix C) covalent bonding between complementary purine and pyrimidine bases. D) ionic bonds between the negatively charged phosphate groups and the positively charged pyrimidine bases. E) hydrophobic interactions between aromatic bases at the center of the double helix and ionic bonds between the negatively charged phosphate groups and the positively charged pyrimidine bases
The yeast used in making bread, beer, and wine is
A. Leuconostoc mesenteroides. B. Propionibacterium. C. Saccharomyces cerevisiae. D. Streptococcus lactis and Lactobacillus. E. Spirulina.