BIOCHEM CHAPTER 2 EXAM 7
Nucleotides consist of - CORRECT ANSWER-sugars, nitrogenous base, and
phosphate group
Nucleosides - CORRECT ANSWER-base + sugar
Purines - CORRECT ANSWER-Adenine and Guanine
- double ring structure
Pyrimidines - CORRECT ANSWER-Cytosine and Thymine also Uracil
- single ring structure
How to DNA polymers form? - CORRECT ANSWER-OH bonds to phosphate to form
polymers (phosphodiester bond)
Deoxyribose - CORRECT ANSWER-
Ribose - CORRECT ANSWER-
Nucleic acid chain directionality - CORRECT ANSWER-phosphoryl group attached to 5'
end
free hydroxyl attached to 3' end
stem-loop structure - CORRECT ANSWER-A sequence of RNA containing internal GC
base pairing such that a hairpin loop forms during its transcription, which serves as a
mechanism to terminate continued transcription.
DNA recombination - CORRECT ANSWER-exchange of genetic information between
two DNA molecules
- two daughter molecules of DNA are formed by the exchange of two parental strands
semiconservative replication - CORRECT ANSWER-Method of DNA replication in
which parental strands separate, act as templates, and produce molecules of DNA with
one parental DNA strand and one new DNA strand
Topoisomerase Function - CORRECT ANSWER-- prepares double helix for unwinding
Helicase Mechanism - CORRECT ANSWER-separate double stranded DNA into single
strands allowing each strand to be copied
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