Propose an appropriate solvent to be used in the extraction of photosynthetic pigments from chloroplasts. Explain your
choice. What will be an ideal response?
Concepts to Consider: A suitable solvent would be any hydrophobic organic solvent such as
acetone or petroleum ether. The reason for this is that the pigments are hydrophobic and are
embedded in a hydrophobic thylakoid membrane.
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Steroid hormone-nuclear receptor complexes:
A. have two adjacent zinc fingers in their DNA binding domain. B. bind to DNA in their monomeric form. C. have N-terminal ligand binding domains. D. are expressed uniformly in all cells.
Other microorganisms besides coliforms that have been used as indicators of fecal contamination may be
A. Clostridia. B. Enterococci. C. bacteriophages. D. Bacteroides. E. Clostridia, Enterococci AND bacteriophages
Which one of the following statements is true of the 32 allele in the CCR5 gene? (Choose all that apply)
A. It codes for a mutant protein that is completely inactive. B. It leads to a deletion which maintains the reading frame. C. It provides some protection against HIV progression to AIDS in both its heterozygous and homozygous forms. D. It is an example of a beneficial mutation. E. It affects the attachment of HIV to an animal cell by altering one of the viral proteins.
A cleaning solution used on the venipuncture site to avoid skin contamination of the blood sample is called a(n):
a. surfactant. b. disinfectant. c. biocide. d. antiseptic.