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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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.
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.
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.
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