The packaging of eukaryotic DNA into chromatin renders most promoters inaccessible to RNA polymerases and activator proteins. Under these conditions, most eukaryotic genes are:
A. constitutively repressed.
B. constitutively activated
C. globally expressed.
D. insulated by nucleosome binding.
A
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What is happening when someone sprays a bottle of perfume and fragrance spreads evenly throughout the room?
a. Effusion b. Perfusion c. Osmosis d. Diffusion
Archaeons have been isolated from both temperate and cold environments.
Answer the following statement true (T) or false (F)
A short segment of DNA that contains the code or blueprint for one or more proteins is called a gene
Indicate whether the statement is true or false
CD4 and CD8 T cells are likely to become active when they:
A) are attracted by the inflammatory response. B) travel through lymph nodes. C) interact with B-cells. D) travel through the spleen. E) dock with a dendritic cell with a matching antigen.