Biochemistry ACS Exam | Actual Questions and Answers Latest Updated 2026/2027 (Graded A+)

Biochemistry ACS Exam | Actual Questions and Answers Latest
Updated 2026/2027 (Graded A+)

• Question
nucleotides

Correct Answer: monomeric unit for nucleic acids and are composed of nitrogenous
base, 5-carbon sugar and a phosphate


• Question
nucleic acids are biopolymers of

Correct Answer: nucleotide monomers


• Question
DNA

Correct Answer: -more stable
I. carrier of genetic information
II. double stranded


• Question
RNA

Correct Answer: I. less stable
II. intermediate in expression of genetic information
III. can form secondary structure (as in tRNA) by hydrogen bonding with itself
IV. not all forms of RNA are intermediates in expression of genetic information
V. single stranded (usually)


• Question
types of RNA

Correct Answer: I. tRNA
II. rRNA
III. siRNA
IV. miRNA


• Question
tRNA

Correct Answer: I. transfer RNA
II. holds amino acids used in protein synthesis
III. WOBBLE position (inosine)

, • Question
rRNA

Correct Answer: I. ribosomal RNA
II. part of the ribosome


• Question
siRNA

Correct Answer: I. small interfering RNA
II. short term silencing of pleiotrophin coding genes
III. targets mRNA for degradation


• Question
miRNA

Correct Answer: I. micro RNA
II. silencing and post-transcriptional regulation of gene expression


• Question
purines

Correct Answer: I. 2 rings
II. adenine, guanine


• Question
pyrimidines

Correct Answer: I. single ring
II. cytosine, thymine
III. uracil (RNA only)


• Question
number of H bonds in A-T/U

Correct Answer: 2


• Question
number of H bonds in G-C

Correct Answer: 3


• Question
adenine


• Question
guanine