BIOL 2300 Quizzes 1-7 Latest Update Graded A+

BIOL 2300 Quizzes 1-7 Latest Update Graded A+ DNA is negatively charged because a. the ribose sugars of DNA are positively charged b. the ribose sugars of DNA are negatively charged c. the nitrogenous bases are negatively charged d. the phosphate backbone of DNA is negatively charged e. DNA is not acidic d. the phosphate backbone of DNA is negatively charged DNA replication is a. semi-conservative b. dispersive c. conservative d. error prone a. semi-conservative Define DNA helicase unwinds DNA; that is, breaks the hydrogen bonds between two stands of DNA Define DNA ligase seals the nicks in DNA strands by creating phosphodiester bonds between adjacent nucleotides Define primase sythesizes short RNA primers to initiate DNA synthesis Define gyrase relieves the torque upstream of the replication fork Fill in the blanks: In ___________, DNA is packaged into chromatin; _____________ is highly condensed DNA throughout the cell cycle. a. prokaryotes; euchromatin b. prokaryotes; heterochromatin c. eukaryotes; heterochromatin d. eukaryotes; euchromatin c. eukaryotes; heterochromatin The 3' CARBON of the ribose sugar of DNA is important because a. it is attached to a the phosphate group b. it is attached to hydrogen (-H) in DNA, whereas in RNA it is attached to a hydroxyl (-OH) group c. it is attached to a hydroxyl (-OH) group that is essential to add new nucleotides to a nucleic acid strand d. it is attached to the nitrogenous base c. it is attached to a hydroxyl (-OH) group that is essential to add new nucleotides to a nucleic acid strand What are the four bases of DNA? What about RNA? Adenine, thymine, cytosine, and guanine. In RNA the bases are adenine, uracil, cytosine, and guanine. In the first level of chromatin organization,