Examlex
A(n) ________________ is a device that measures the air flowing out of the lungs, called the peak expiratory flow rate (PEFR), as a patient blows forcefully into the device.
Acetyl Groups
Functional groups derived from acetic acid, consisting of a methyl group single-bonded to a carbonyl. The formula is CH3CO, often denoted as Ac in chemical structures.
Histone Tails
Histone tails are the N-terminal extensions of histone proteins that protrude from the nucleosome and play a key role in regulating gene expression by undergoing various chemical modifications.
Nucleosome
A basic unit of DNA packaging in eukaryotes, consisting of a segment of DNA wound around a core of histone proteins.
Transcriptionally Inactive
Refers to a state where certain genes or portions of the genome are not being transcribed into RNA, possibly due to regulatory mechanisms or chromatin structure.
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