CHEM 210 – Exam 6 – 2025/2026 – PracticeCHEM 210 — Biochemistry Exam 6 (Portage Learning) Prep 2025–2026 (Verified Questions & Answers, A+ Grade)

chem 210 exam 6 questions and answers
2025\2026 A+ Grade

in RNA, guanine always pairs with ______

A. thymine

B. guanine

C. cytosine

D. uracil

E. both A and B
- correct answer C. cytosine



DNA is built from which of the following?

A. nucleosides

B. genes

C. purines

D. nucleotide

E. codons
- correct answer D. nucleotide



the Z-form helix of DNA is stabilized mainly by_____

A. ionic bonds

B. covalent bonds

C. hydrogen bonds

D. ion-dipole bonds

E. hydrogen covalent bonds
- correct answer C. hydrogen bonds

, which of the following pentose sugars is a constituent of mRNA?

A. ribose

B. xylose

C. ribitol

D. 2-deoxyribose

E. arabinose
- correct answer A. ribose



Purines have ____ ring(s), (each) containing _____ nitrogen(s), whereas pyrimidines have _____ ring(s),
(each) containing _____ nitrogens.



A. 1; 1; 1; 1

B. 1; 2; 1; 2

C. 2; 1; 1; 2

D. 2; 2; 1; 1

E. 2; 2; 1; 2
- correct answer E. 2; 2; 1; 2



which of the following nucleic acids is responsible for using the encoded genetic information to produce
proteins found in living organisms?

A. peptide nucleic acid

B. ribonucleic acid

C. ribitol nucleic acid

D. deoxyribonucleic acid

E. glycerol nucleic acid
- correct answer B. ribonucleic acid



identify the complementary bases from the following

A. adenine-cytosine