est Bank – Lehninger Principles of Biochemistry, 8th Edition.pdf

Test Bank – Lehninger Principles of
Biochemistry, 8th Edition
Nelson & Cox | Chapters 1-28 | Complete Questions
with Answers and Rationales




ISBN: 9781319228002
Authors: David L. Nelson, Michael M. Cox
Edition: 8th Edition
Total Questions: 200+ (Comprehensive Chapter-by-
Chapter Coverage)




CHAPTER 1: THE FOUNDATIONS OF
BIOCHEMISTRY
Questions 1-25

1

,Question 1
Which element is most abundant in living organisms
by mass?
A) Nitrogen
B) Carbon
C) Oxygen
D) Phosphorus


Correct Answer: C) Oxygen
Rationale: Oxygen is the most abundant element in
the human body by mass, forming water and organic
molecules. Carbon, hydrogen, and nitrogen are also
abundant but less so than oxygen .




2

,Question 2
The four most abundant elements in living
organisms are:
A) Carbon, hydrogen, oxygen, nitrogen
B) Carbon, oxygen, phosphorus, sulfur
C) Iron, magnesium, zinc, copper
D) Sulfur, phosphorus, potassium, calcium


Correct Answer: A) Carbon, hydrogen, oxygen,
nitrogen
Rationale: Carbon, hydrogen, oxygen, and nitrogen
comprise over 96% of living matter. These elements
form the backbone of all biomolecules. Trace
elements and other minerals are present in smaller
quantities .




3

, Question 3
The three domains of life are:
A) Eukarya, Bacteria, and Archaea
B) Animalia, Plantae, and Fungi
C) Prokaryota, Eukaryota, and Monera
D) Vertebrata, Invertebrata, and Protista


Correct Answer: A) Eukarya, Bacteria, and Archaea
Rationale: The three domains of life are Eukarya
(eukaryotes), Bacteria, and Archaea. This
classification is based on differences in ribosomal
RNA sequences and cellular organization .




Question 4


4