Test Bank For Lehninger Principles of Biochemistry 8th Edition By
David L. Nelson, Michael M. Cox Isbn-9781319228002, Chapter 1-
28 PRACTICE QUESTIONS |ORIGINAL QUESTIONS & ANSWERS
|DETAILED RATIONALES |HINTED COMPLETE EXAM PREP GRADED
A+*INSTANT DOWNLOAD PDF
1. Which statement best describes the central focus of
biochemistry?
A. Classification of organisms
B. Study of geological processes
C. Study of the chemical processes occurring in living organisms
D. Study of planetary motion
,Biochemistry examines the chemical structures, reactions, and
processes that underlie life.
2. Which element is the most abundant element by mass in the
human body?
A. Carbon
B. Nitrogen
C. Oxygen
D. Calcium
Oxygen accounts for a large proportion of body mass, largely because
of its presence in water.
3. Why is carbon particularly suitable as the structural basis of
biological molecules?
A. It forms only ionic bonds
B. It can form four stable covalent bonds
C. It cannot bond to itself
D. It is chemically inert
Carbon's tetravalence allows formation of diverse chains, rings, and
branched structures.
4. Which type of bond results from sharing electrons between
atoms?
A. Hydrogen bond
B. Ionic bond
C. Covalent bond
D. Van der Waals interaction
A covalent bond involves sharing one or more pairs of electrons.
5. What is the primary function of metabolic pathways?
A. Store genetic information
B. Convert molecules through organized sequences of chemical
reactions
,C. Prevent all chemical reactions
D. Eliminate all proteins
Metabolic pathways consist of linked enzyme-catalyzed reactions
that transform substrates into products.
6. Which property distinguishes enzymes from many inorganic
catalysts?
A. They are always lipids
B. They cannot bind substrates
C. They generally exhibit high specificity for their substrates and
reactions
D. They function only at very high temperatures
Enzymes recognize particular substrates and catalyze specific
chemical transformations.
7. What is meant by the term metabolism?
A. Protein synthesis alone
B. DNA replication alone
C. The complete set of chemical reactions in an organism
D. Cellular movement
Metabolism encompasses both degradative and biosynthetic
reactions.
8. Which process generally releases energy from nutrient
molecules?
A. Anabolism
B. Catabolism
C. Replication
D. Transcription
Catabolic pathways break down molecules and commonly conserve
released energy in ATP and reduced cofactors.
9. Anabolic pathways generally:
, A. Degrade macromolecules
B. Produce only carbon dioxide
C. Build complex molecules from simpler precursors
D. Destroy ATP
Anabolism requires energy and reducing power to synthesize cellular
components.
10. Which molecule is commonly used as an immediate energy
currency in cells?
A. DNA
B. Cholesterol
C. ATP
D. Cellulose
ATP couples energy-releasing reactions to energy-requiring cellular
processes.
Chapter 2 — Water
11. Why is water an excellent solvent for many biological
substances?
A. It is completely nonpolar
B. It is polar and can form hydrogen bonds
C. It contains carbon
D. It cannot interact with ions
Water's polarity allows it to stabilize ions and polar molecules.
12. The polarity of a water molecule arises primarily because:
A. Oxygen and hydrogen have identical electronegativities
B. Oxygen is more electronegative than hydrogen
C. Hydrogen contains extra neutrons
D. Water is ionic
David L. Nelson, Michael M. Cox Isbn-9781319228002, Chapter 1-
28 PRACTICE QUESTIONS |ORIGINAL QUESTIONS & ANSWERS
|DETAILED RATIONALES |HINTED COMPLETE EXAM PREP GRADED
A+*INSTANT DOWNLOAD PDF
1. Which statement best describes the central focus of
biochemistry?
A. Classification of organisms
B. Study of geological processes
C. Study of the chemical processes occurring in living organisms
D. Study of planetary motion
,Biochemistry examines the chemical structures, reactions, and
processes that underlie life.
2. Which element is the most abundant element by mass in the
human body?
A. Carbon
B. Nitrogen
C. Oxygen
D. Calcium
Oxygen accounts for a large proportion of body mass, largely because
of its presence in water.
3. Why is carbon particularly suitable as the structural basis of
biological molecules?
A. It forms only ionic bonds
B. It can form four stable covalent bonds
C. It cannot bond to itself
D. It is chemically inert
Carbon's tetravalence allows formation of diverse chains, rings, and
branched structures.
4. Which type of bond results from sharing electrons between
atoms?
A. Hydrogen bond
B. Ionic bond
C. Covalent bond
D. Van der Waals interaction
A covalent bond involves sharing one or more pairs of electrons.
5. What is the primary function of metabolic pathways?
A. Store genetic information
B. Convert molecules through organized sequences of chemical
reactions
,C. Prevent all chemical reactions
D. Eliminate all proteins
Metabolic pathways consist of linked enzyme-catalyzed reactions
that transform substrates into products.
6. Which property distinguishes enzymes from many inorganic
catalysts?
A. They are always lipids
B. They cannot bind substrates
C. They generally exhibit high specificity for their substrates and
reactions
D. They function only at very high temperatures
Enzymes recognize particular substrates and catalyze specific
chemical transformations.
7. What is meant by the term metabolism?
A. Protein synthesis alone
B. DNA replication alone
C. The complete set of chemical reactions in an organism
D. Cellular movement
Metabolism encompasses both degradative and biosynthetic
reactions.
8. Which process generally releases energy from nutrient
molecules?
A. Anabolism
B. Catabolism
C. Replication
D. Transcription
Catabolic pathways break down molecules and commonly conserve
released energy in ATP and reduced cofactors.
9. Anabolic pathways generally:
, A. Degrade macromolecules
B. Produce only carbon dioxide
C. Build complex molecules from simpler precursors
D. Destroy ATP
Anabolism requires energy and reducing power to synthesize cellular
components.
10. Which molecule is commonly used as an immediate energy
currency in cells?
A. DNA
B. Cholesterol
C. ATP
D. Cellulose
ATP couples energy-releasing reactions to energy-requiring cellular
processes.
Chapter 2 — Water
11. Why is water an excellent solvent for many biological
substances?
A. It is completely nonpolar
B. It is polar and can form hydrogen bonds
C. It contains carbon
D. It cannot interact with ions
Water's polarity allows it to stabilize ions and polar molecules.
12. The polarity of a water molecule arises primarily because:
A. Oxygen and hydrogen have identical electronegativities
B. Oxygen is more electronegative than hydrogen
C. Hydrogen contains extra neutrons
D. Water is ionic
