A mutation within the promoter region of a gene prevents RNA polymerase from recognizing and binding. What effect will this have on the expression of this gene?
A) The mutation will act as a positive control and increase expression of the gene.
B) The mutation will prevent expression of the gene.
C) The mutation will cause the protein produced by the gene to fold more tightly into its tertiary structure.
D) The mutation will cause RNA polymerase to attach to the termination site, and gene expression will decrease.
E) The mutation will cause the protein produced by the gene to denature
B) The mutation will prevent expression of the gene.
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In Arabidopsis, the floral meristem is organized into four concentric whorls of cells, each of which gives rise to a specific organ of the mature flower. The floral meristem is therefore analogous to what cells or tissues in animals?
A. totipotent stem cells B. cells in the morula C. the inner cell mass of the blastula D. the germ layers of the gastrula E. None of these choices is correct.
Bacterial Strain A divides every 30 minutes. If you require at least 4 billion cells to perform an experiment, how long will you need to incubate a culture tube inoculated with a single cell of Bacteria A to get enough material to perform your experiment?
A. 16 B. 32 C. 4 D. 8 E. 2
Which of the following intermediate filament proteins is incorrectly matched with the tissue in which it is found?
A) cytokeratins-epithelial B) desmin-smooth muscle C) vimentin-mesenchymal D) nestin-connective E) GFA protein-nervous
In a human, the 46 chromosomes would be at the equator during
A. interphase. B. prophase. C. anaphase. D. metaphase.