In the biochemical oxygen demand (BOD) test, the factor that should limit biological activity is ________.
A. phosphorus
B. carbon
C. nitrogen
D. oxygen
Answer: B
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Which of the following proteins is NOT required for homologous recombination?
A) Hfr B) RecA C) proteins having helicase activity D) endonuclease
You have two populations of flowering plants. In these populations floral color is controlled by one gene. The red gene (R) is dominant to the white gene (r). In population one, 75% of the flowers are red, in population two 25% of the flowers are white
Assuming H-W, which population has a greater frequency of the R allele? A. population 1 B. population 2 C. Neither; they both have the same frequency.
You are experimenting with a variety of lipids to determine their efficacy for use as drug delivery system liposomes. What is one feature of the individual lipid that would best ensure the use of a lipid for this purpose?
A) It must have a structure similar to cholesterol. B) It must be composed entirely of unsaturated fatty acids. C) It should be exclusively hydrophilic. D) It should be amphipathic. E) It should be exclusively hydrophobic.
Plant cells permit ions and small molecules to move between adjacent cells by means of cytoplasmic channels in their
cell walls known as ____.
a. gap junctions b. plasmodesmata c. desmosomes d. cell junctions e. tonoplasts