Under what circumstance can an individual with Down syndrome have 46 chromosomes?
What will be an ideal response?
if he or she carries a D/G translocation, 14/21, for example
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Answer the following statements true (T) or false (F)
1. When lactose becomes available the genes encoding ?-galactosidase and lactose permease are upregulated in E. coli. 2. Different globin polypeptides are expressed at similar levels during the embryonic and fetal stages of mammalian development. 3. Bacteria can regulate gene expression by controlling the rate at which mRNA is translated into protein. 4. Small effector molecules directly bind the DNA they regulate.
The name of the process that takes place when organic compounds are broken down in the absence of oxygen is
A.) respiration. B.) oxidation. C.) fermentation. D.) photosynthesis.
In terms of controlling the spread of microbes throughout the environment, which facility has more stringent requirements?
A) A hospital B) A microbiology lab
Which of the following is not true of antibodies?
A) Antibodies bind to antigens. B) T cells produce antibodies. C) There are many different kinds of antibodies. D) Vaccines can stimulate production of antibodies. E) Antibodies are secreted by plasma cells.