ASU BIO 181 Exam 2 A+ Exam FOCUS Questions and Answers Verified Solutions Latest Update 2026/2027

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ASU BIO 181 Exam 2 A+ Exam FOCUS Questions and Answers Verified Solutions Latest Update 2026/2027

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ASU BIO 181 Exam 2 A+ Exam FOCUS Questions and Answers Verified Solutions Latest Update 2026/2027

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ASU BIO 181 Exam 2 A+ Exam FOCUS
Questions and Answers Verified Solutions
Latest Update 2026/2027

Question:
What are the 3 components of a nucleotide?

Answer:
pentose (5' Carbon) sugar, phosphate group, nitrogenous base

Question:
What 5'C sugar is present in DNA?

Answer:
Deoxyribose

Question:
What 5'C sugar is present in RNA?

Answer:
Ribose

Question:
What are the nitrogenous bases found in DNA?

Answer:
A, G, C, T

Question:
What are the nitrogenous bases in RNA?

,Answer:
A, G, C, U

Question:
Which nitrogenous bases are purines?

Answer:
Adenine and guanine

Question:
Which nitrogenous bases have 2 rings?

Answer:
Purines (Adenine and guanine)

Question:
Which nitrogenous bases are pyrimidines?

Answer:
Cytosine, Uracil (in RNA), Thymine (in DNA)

Question:
Which nitrogenous bases have 1 ring?

Answer:
Pyrimidines (Cytosine, uracil, thymine)

Question:
How are nucleotides joined together? (Dehydration or hydrolysis?)

Answer:
Dehydration

, Question:
What bond forms between complementary base pairs to hold the two strands of the double helix
together?

Answer:
Hydrogen bonds

Question:
Where are phosphodiester bonds formed?

Answer:
Phosphate group in one nucleotide (5'C) and the OH group (3'C) in the other nucleotide

Question:
What is the backbone of a nucleotide strand made of?

Answer:
Sugar and phosphate (sugar-phosphate backbone)

Question:
What shape does DNA form?

Answer:
Double helix

Question:
Are the 2 strands of DNA parallel or anti-parallel?

Answer:
Anti-parallel

Question:
A pairs with (in DNA)

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Uploaded on: August 14, 2026
Number of pages: 18
Written in: 2026/2027
Type: Exam (elaborations)
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