How is the leucine zipper formed, and what is its function?
What will be an ideal response?
Answer: The leucine zipper is a specific domain, or a specific region within a protein, containing leucine amino acids repeated every seven residues, which do not directly bind to DNA. Its formation occurs abiotically once the protein is translated and functions by containing two DNA recognition helices within the protein that bind to DNA.
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To treat severe combined immunodeficiency (SCID) by gene therapy, a patient's white blood cells are removed, followed by the delivery of a normal gene into the cells. The altered cells are then returned to the patient's body. This is an example of _____ gene therapy
a. enhancement b. germ-line c. viral d. in vivo e. ex vivo
The gene that codes for the repressor protein of the E. coli lactose operon is:
a. located between the operator and the promoter. b. downstream from the promoter region. c. downstream from the operator. d. constitutive. e. turned off most of the time.
Biomagnification involves compounds having higher relative concentrations in ________.
A. lower trophic levels B. higher trophic levels C. top consumers or higher trophic levels D. top consumers
An example of purple photosynthetic bacteria's metabolic flexibility is seen in Rhodospirillum rubrum using a "decision-making" process. When oxygen is present, the bacterium uses fermentation, photoheterotrophy, or photoautotrophy but if oxygen is absent, it switches metabolic pathways to grow chemoorganotrophically.
Answer the following statement true (T) or false (F)