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Portage Learning - CHEM 210 Biochemistry Module 6 Exam (2025 / 2026) Ques & Ans, Exams of Biochemistry

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CHEM 210 - MODULE 6 EXAM
In RNA, guanine always pairs with .
Thymine
Guanine
Cytosine
Uracil
Both A and B
CYSTOSINE
DNA is built from which of the following?
Nucleosides
Genes
Purines
Nucleotide
Codons
NUCLEOTIDE
The Z-form helix of DNA is stabilized mainly by .
Ionic bonds
Covalent bonds
Hydrogen bonds
Ion-dipole bonds
Hydrogen covalent bonds
HYDROGEN BONDS
Question 1
3 / 3 pts
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Question 2

3 / 3 pts

Question 3

3 / 3 pts

CHEM 210 - MODULE 6 EXAM

In RNA, guanine always pairs with.

Thymine Guanine Cytosine Uracil Both A and B CYSTOSINE

DNA is built from which of the following?

Nucleosides Genes Purines Nucleotide Codons NUCLEOTIDE

The Z-form helix of DNA is stabilized mainly by.

Ionic bonds Covalent bonds Hydrogen bonds Ion-dipole bonds Hydrogen covalent bonds HYDROGEN BONDS

Question 1

3 / 3 pts

Question 5

3 / 3 pts

Question 4

3 / 3 pts

Question 6

3 / 3 pts

Which of the following pentose sugars is a constituent of mRNA?

Ribose Xylose Ribitol 2-deoxyribose Arabinose RIBOSE

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

1; 1; 1; 1 1; 2; 1; 2 2; 1; 1; 2 2; 2; 1; 1 2; 2; 1; 2 2; 2; 1; 2

Identify the base guanine from among the following structures.

Question 7

3 / 3 pts

D.

E.

D

Which of the following nucleic acids is responsible for using the encoded geneticinformation to produce proteins found in living organisms?

Peptide nucleic acid Ribonucleic acid Ribitol nucleic acid Deoxyribonucleic acid Glycerol nucleic acid RIBONUCLEIC ACID

Question 9

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Question 10

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Identify the complementary bases from the following.

Adenine-Cytosine Adenine- Thymine Guanine-Thymine Guanine-Adenine Cytosine-Uracil ADENINE-THYMINE

How many hydrogen bonds are made between T and its complementary nucleotide?

2 3 4 5 6 2

Question 8

3 / 3 pts

Question 14

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A-form X-Form C-form L-form Z-form A-FORM

Which of the following is a second messenger in cells?

FAD cAMP AMP dATP UTP cAMP

functions as a protein coenzyme.

ATP AMP FAD cAMP GGG FAD

rRNA makes up about percent of ribosomes.

Question 17

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Question 18

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65

The conclusion that G and C are present in DNA in equimolar amounts is credited to .

James Watson Francis Crick Erwin Chargaff Both A and B None of the above ERWIN CHARGAFF

The primary sequence of DNA is written.

N to C C to N 5 ’ to 3’ 3 ’ to 5’ Both A and D 5 ’ to 3’

In the Watson-Crick model for the double helix, which statement is NOT true?The two

strands run parallel to one another

Question 19

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CTP

GTP

GTP

Which of the following is a nucleoside?

A.

B.

Question 23

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C.

D.

E. Both A and C

E.BOTH A AND C

Which of the following is heterocyclic?

Question 24

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Question 25

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D. Both B and C

E. None of the above

C

A major component of RNA but not DNA is:

AMP GMP UMP CMP TMP UMP

On the following molecule, which letter (A, B, C, D, or E) indicates the 5’ end?

Question 26

5 / 5 pts

B

(Short answer) Scientists say that two DNA strands are complementary. Briefly describewhat is meant by complementary. Show one example in your response.

The nucleotide sequences of complementary strands are such that, whenever an A occurs in one strand, there is a T in the other strand withwhich it can form a hydrogen-bonded base pair. Whenever a C occurs inone strand, a G occurs in the other. A is the base that is complementaryto T, and C is the base complementary to G.

A) Nucleotides

B) adenine and guanine

C) Uracil

D) G-C

E) 2-deoxyribose

Question 30

5 / 5 pts

(Short answer) The monomers of RNA nucleic acids, called nucleotides, consistof three parts. What are those three parts? (Give three)

Your Answer:

phosphoric acid, ribose (a pentose sugar) and an organic base.