Biochemistry Chapter 8 – Genetic
Information Flow & Energy Metabolism|
Latest Updated with A+ Graded Rationales
What are the four major classes of biomolecules?
Proteins, Nucleic Acids, Lipids, and Carbohydrates.
What are nucleic acids composed of?
Polymers of nucleotides, also called polynucleotides.
What are the three components of a nucleotide?
A five-carbon sugar, a weakly basic nitrogenous base, and a phosphate group.
What are nucleotides chemically considered?
Phosphate esters of nucleosides.
What are nucleosides composed of?
A nitrogenous base linked to a five-carbon sugar (ribose or deoxyribose) without any phosphate
group.
What distinguishes nucleotides from nucleosides?
Nucleotides have one or more phosphate groups attached; nucleosides do not.
What are the two types of nucleic acids?
Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
What sugar is found in DNA, and how does it differ from RNA's sugar?
DNA contains deoxyribose, which lacks an oxygen at the 2′ carbon that ribose (in RNA) has.
Why is deoxyribose less reactive than ribose?
The missing 2′ hydroxyl group in deoxyribose makes DNA more chemically stable.
What is the biological function of nucleic acids?
They store and transmit genetic information and direct protein synthesis.
Describe the flow of genetic information.
, DNA is replicated to make copies of itself, transcribed into mRNA, and mRNA is translated into
protein.
What is replication?
The process of copying DNA to produce two identical DNA molecules.
What is transcription?
The process where DNA sequence information is copied into messenger RNA (mRNA).
What is translation?
The process where mRNA is read to synthesize a specific polypeptide chain.
Why is DNA described as the "blueprint of life"?
It contains the genetic instructions used in development, functioning, and reproduction of
organisms.
How do nucleotides participate in energy metabolism?
ATP (adenosine triphosphate) acts as the universal energy currency by providing energy for
biochemical reactions.
What are some coenzymes derived from nucleotides?
NAD⁺, FAD, and Coenzyme A.
What is the role of NAD⁺ in metabolism?
NAD⁺ acts as an electron carrier in redox reactions during cellular respiration.
What is the role of FAD in metabolism?
FAD functions as a redox coenzyme that transfers electrons in metabolic pathways such as the
citric acid cycle.
What is the function of Coenzyme A?
It carries acyl groups (like acetyl groups) in metabolic reactions.
What is cAMP, and what role does it play?
Cyclic adenosine monophosphate (cAMP) acts as a second messenger in intracellular signaling
pathways.
What is the difference between AMP, ADP, and ATP?
They differ in the number of phosphate groups: AMP has one, ADP has two, and ATP has three.
Information Flow & Energy Metabolism|
Latest Updated with A+ Graded Rationales
What are the four major classes of biomolecules?
Proteins, Nucleic Acids, Lipids, and Carbohydrates.
What are nucleic acids composed of?
Polymers of nucleotides, also called polynucleotides.
What are the three components of a nucleotide?
A five-carbon sugar, a weakly basic nitrogenous base, and a phosphate group.
What are nucleotides chemically considered?
Phosphate esters of nucleosides.
What are nucleosides composed of?
A nitrogenous base linked to a five-carbon sugar (ribose or deoxyribose) without any phosphate
group.
What distinguishes nucleotides from nucleosides?
Nucleotides have one or more phosphate groups attached; nucleosides do not.
What are the two types of nucleic acids?
Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
What sugar is found in DNA, and how does it differ from RNA's sugar?
DNA contains deoxyribose, which lacks an oxygen at the 2′ carbon that ribose (in RNA) has.
Why is deoxyribose less reactive than ribose?
The missing 2′ hydroxyl group in deoxyribose makes DNA more chemically stable.
What is the biological function of nucleic acids?
They store and transmit genetic information and direct protein synthesis.
Describe the flow of genetic information.
, DNA is replicated to make copies of itself, transcribed into mRNA, and mRNA is translated into
protein.
What is replication?
The process of copying DNA to produce two identical DNA molecules.
What is transcription?
The process where DNA sequence information is copied into messenger RNA (mRNA).
What is translation?
The process where mRNA is read to synthesize a specific polypeptide chain.
Why is DNA described as the "blueprint of life"?
It contains the genetic instructions used in development, functioning, and reproduction of
organisms.
How do nucleotides participate in energy metabolism?
ATP (adenosine triphosphate) acts as the universal energy currency by providing energy for
biochemical reactions.
What are some coenzymes derived from nucleotides?
NAD⁺, FAD, and Coenzyme A.
What is the role of NAD⁺ in metabolism?
NAD⁺ acts as an electron carrier in redox reactions during cellular respiration.
What is the role of FAD in metabolism?
FAD functions as a redox coenzyme that transfers electrons in metabolic pathways such as the
citric acid cycle.
What is the function of Coenzyme A?
It carries acyl groups (like acetyl groups) in metabolic reactions.
What is cAMP, and what role does it play?
Cyclic adenosine monophosphate (cAMP) acts as a second messenger in intracellular signaling
pathways.
What is the difference between AMP, ADP, and ATP?
They differ in the number of phosphate groups: AMP has one, ADP has two, and ATP has three.
