Adding acetyl and methyl groups to a histone regulates gene expression by _________________.
A. increasing the pH of the cell
B. loosening the DNA wound around the histone
C. modifying the nucleotides of the promoter region of the DNA molecule
D. tightening the DNA wound around the histone
E. enhancing the development of a DNA-RNA hybrid
Answer: B
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Secondary bacterial infections may occur with the common cold.
Answer the following statement true (T) or false (F)
Which disorder is correctly matched with the affected tissue?
a. Crohn's disease - thyroid b. Grave's disease - kidneys c. Diabetes mellitus type I - liver d. Rheumatoid arthritis - joints e. Dermatomyositis - gastrointestinal tract
If a pure-breeding wired-hair terrier (WW) is
crossed with a pure-breeding smooth-hair terrier (ww), and a puppy with a wavy hair is produced, the simplest explanation is
a. a mutation. b. an X-linked gene. c. an incompletely dominant gene. d. a lethal gene. e. codominance
The process by which an original species is transformed into a new species over an extended period of time that spans many generations is known as __________
A) anagenesis B) cladogenesis C) morphogenesis D) neogenesis E) founder effect