Describe the basic structure of a nucleosome. What is the role of histone H1?
What will be an ideal response?
Nucleosomes are composed of four different histone molecules, each of which exists twice, thus forming an octomer. Histone H1 is between nucleosomes and is associated with linker DNA.
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In eastern Oregon, the mycelium of a single individual, Armillaria ostoyae, a member of the fungal phylum ____,
covers an area equivalent to 1665 football fields (nearly 6000 m across).
a. Glomeromycota b. Basidiomycota c. Chytridiomycota d. Zygomycota e. Ascomycota
Which statement describes evidence in support of the endosymbiont theory?
A) The sequence of mitochondrial rRNA genes are most similar to the rRNA genes in purple bacteria. B) Mitochondrial and chloroplast DNA is organized into nucleosomes. C) Mitochondria and chloroplasts have genes that allow them to live independently. D) Mitochondria, chloroplasts, and cytoplasmic translation are inhibited by antibiotics such as chloramphenicol.
Which of the following sequences correctly represents the phytochrome signal transduction pathway?
a. red light ? PIF3 activation ? PIF3 into nucleus ? light-responsive gene switched off b. red light ? Pfr to Pr ? Pr into nucleus ? Pr-PIF3 complex ? light-responsive gene regulation c. UV light ? PIF3 into nucleus ? light responsive gene produces phytochrome ? Pr to Pfr d. blue light ? Pfr into nucleus ? Pfr-PIF3 complex ? light-responsive gene regulation e. red light ? Pr to Pfr ? Pfr into nucleus ? Pfr-PIF3 complex ? light-responsive gene regulation
Which of the following is NOT a natural means of DNA recombination?
A) Viral infection B) Transformation in bacteria C) PCR D) Sexual reproduction