Exam 2 ASU BIO 340 General Genetics Questions and Complete Solutions Graded A+

Exam 2 ASU BIO 340
General Genetics
Questions and Complete
Solutions Graded A+

Denning [Date] [Course title]

, components of a nucleotide - Correct Ans: phosphate group, 5 carbon sugar, nitrogenous base



types of nitrogenous bases - Correct Ans: purines and pyrimidines



1' (deoxyribose carbon atom numbering system) - Correct Ans: the carbon attached to the nitrogenous
base



2' (deoxyribose carbon atom numbering system) - Correct Ans: the deoxy carbon - only hydrogens
attached



3' (deoxyribose carbon atom numbering system) - Correct Ans: carries the hydroxyl group



4' (deoxyribose carbon atom numbering system) - Correct Ans: binds to the O which binds to the 1' to
make the ring



5' (deoxyribose carbon atom numbering system) - Correct Ans: carries the phosphate group



DNA strand polarity - Correct Ans: Each strand of DNA has distinct 5' and 3' ends creating polarity within
the backbone.



5' will have an -OH or phosphate group bonded to C-5' of the sugar, while the 3' end has a free -OH on C-
3 of the sugar.



Rules to apply - Correct Ans: pyrimidine vs purine

A=T, C=G

3 hyrdogen bonds (C-G), 2 hydrogen bonds (A-T)

5' carbon vs 3' carbon

strands are anti-parallel



Chargaff's Rule - Correct Ans: ratios are 1:1