Which of the following is the correct order of the levels of DNA packaging in eukaryotic chromosomes?
A) nucleosome ? chromatin fiber ? looped domains ? heterochromatin
B) nucleosome ? looped domains ? chromatin fiber ? heterochromatin
C) heterochromatin ? nucleosome ? chromatin fiber ? looped domains
D) chromatin fiber ? heterochromatin ? nucleosome ? looped domains
E) chromatin fiber ? nucleosome ? looped domains ? heterochromatin
A) nucleosome ? chromatin fiber ? looped domains ? heterochromatin
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Chemical elements needed in trace amounts for biochemical reactions have a biogeochemical cycle, including boron, chromium, manganese, and cobalt.
Answer the following statement true (T) or false (F)
What class of neurons in the central nervous system sends commands to muscles?
A. afferent neurons B. efferent neurons C. peripheral neurons D. interneurons
The principal government agency responsible for tracking infectious diseases in the United States is the
A. United States Department of Agriculture. B. Infection Control Committee. C. Centers for Disease Control and Prevention. D. World Health Organization. E. National Institutes of Health.
Which of the following best describes the role of regulatory T cells?
A) Regulatory T cells are a kind of helper T cell that stimulates B cells. B) Regulatory T cells stimulate natural killer cells to attack tumors. C) Regulatory T cells are a kind of helper T cell that stimulates cytotoxic T cells. D) Regulatory T cells stabilize and support memory cells. E) Regulatory T cells help limit the immune system response.