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PBS Unit 4.3

Vocabulary

QuestionAnswer
Adenine A component of nucleic acids, energy-carrying molecules such as ATP, and certain coenzymes. Chemically, it is a purine base.
Buffer A solution that minimizes changes in pH when extraneous acids or bases are added to the solution.
Cytosine A component of nucleic acids that carries hereditary information in DNA and RNA in cells. Chemically, it is a pyrimidine base.
Gene A discrete unit of hereditary information consisting of a specific nucleotide sequence in DNA (or RNA, in some viruses).
Guanine A component of nucleic acids that carries hereditary information in DNA and RNA in cells. Chemically, it is a purine base.
Helix Something spiral in form.
Histone A small protein with a high proportion of positively charged amino acids that binds to the negatively charged DNA and plays a key role in its chromatin structure.
Hydrogen bond A type of weak chemical bond formed when the slightly positive hydrogen atom of a polar covalent bond in one molecule is attracted to the slightly negative atom of a polar covalent bond in another molecule.
Lysis A process of disintegration or dissolution (as of cells).
Model A simplified version of something complex used, for example, to analyze and solve problems or make predictions.
Nucleotide A building block of DNA, consisting of a five-carbon sugar covalently bonded to a nitrogenous base and a phosphate group.
Thymine A component of nucleic acid that carries hereditary information in DNA in cells. Chemically, it is a pyrimidine base.
Supernatant The liquid on top of material deposited by settling or centrifugation.
Created by: connie king
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