BIO 189 Final Exam: Fundamentals of Biology V1 - Arizona
College Updated and Latest Questions and Correct
Answers with Rationale
1. What is the smallest unit of life that can perform all life processes?
A. Cell
B. Organ
C. Atom
D. Tissue
Ans: A
Explanation: The cell is recognized as the basic structural and functional unit of all living organisms. It is
the smallest entity that satisfies all the criteria for life. Every living thing is composed of one or more cells
according to cell theory. Cells can exist as independent organisms or as part of multicellular structures.
Understanding the cell is essential for studying complex biological systems.
2. Which organelle is primarily responsible for producing energy in the form of ATP?
A. Golgi apparatus
B. Mitochondria
C. Lysosome
D. Ribosome
Ans: B
Explanation: Mitochondria are often referred to as the powerhouses of the cell. They perform cellular
respiration to convert nutrients into adenosine triphosphate. This molecule provides the energy needed
,for various cellular activities. Mitochondria possess their own DNA and a unique double-membrane
structure. They are found in almost all eukaryotic cells.
3. Which process results in two genetically identical daughter cells?
A. Meiosis
B. Mitosis
C. Fertilization
D. Binary fission
Ans: B
Explanation: Mitosis is the process of cell division used for growth and repair in multicellular organisms.
It ensures that each new cell receives an exact copy of the parent DNA. This type of division involves
several phases including prophase and metaphase. The result is two daughter cells with the same
number of chromosomes as the parent. It differs from meiosis which produces unique gametes.
4. What is the primary function of ribosomes within a cell?
A. DNA replication
B. Waste disposal
C. Lipid production
D. Protein synthesis
Ans: D
Explanation: Ribosomes are the cellular structures where proteins are assembled. They translate genetic
instructions from messenger RNA into polypeptide chains. Ribosomes can be found floating in the
cytoplasm or attached to the endoplasmic reticulum. Every living cell requires ribosomes to produce the
, enzymes and structural proteins needed for life. They are composed of both ribosomal RNA and protein
molecules.
5. In DNA, which nitrogenous base always pairs with Cytosine?
A. Adenine
B. Guanine
C. Uracil
D. Thymine
Ans: B
Explanation: DNA base pairing rules state that cytosine always forms hydrogen bonds with guanine. This
specific pairing ensures the double helix maintains a constant width. These complementary base pairs
allow DNA to be replicated accurately during the cell cycle. Adenine pairs with thymine in DNA but with
uracil in RNA. This chemical affinity is the basis of genetic information storage.
6. Which of the following is a characteristic of prokaryotic cells?
A. Presence of mitochondria
B. Lack of a nucleus
C. Large size
D. Complex organelles
Ans: B
Explanation: Prokaryotic cells are characterized by the absence of a membrane-bound nucleus. Their
genetic material is located in a region called the nucleoid. They also lack most of the specialized
College Updated and Latest Questions and Correct
Answers with Rationale
1. What is the smallest unit of life that can perform all life processes?
A. Cell
B. Organ
C. Atom
D. Tissue
Ans: A
Explanation: The cell is recognized as the basic structural and functional unit of all living organisms. It is
the smallest entity that satisfies all the criteria for life. Every living thing is composed of one or more cells
according to cell theory. Cells can exist as independent organisms or as part of multicellular structures.
Understanding the cell is essential for studying complex biological systems.
2. Which organelle is primarily responsible for producing energy in the form of ATP?
A. Golgi apparatus
B. Mitochondria
C. Lysosome
D. Ribosome
Ans: B
Explanation: Mitochondria are often referred to as the powerhouses of the cell. They perform cellular
respiration to convert nutrients into adenosine triphosphate. This molecule provides the energy needed
,for various cellular activities. Mitochondria possess their own DNA and a unique double-membrane
structure. They are found in almost all eukaryotic cells.
3. Which process results in two genetically identical daughter cells?
A. Meiosis
B. Mitosis
C. Fertilization
D. Binary fission
Ans: B
Explanation: Mitosis is the process of cell division used for growth and repair in multicellular organisms.
It ensures that each new cell receives an exact copy of the parent DNA. This type of division involves
several phases including prophase and metaphase. The result is two daughter cells with the same
number of chromosomes as the parent. It differs from meiosis which produces unique gametes.
4. What is the primary function of ribosomes within a cell?
A. DNA replication
B. Waste disposal
C. Lipid production
D. Protein synthesis
Ans: D
Explanation: Ribosomes are the cellular structures where proteins are assembled. They translate genetic
instructions from messenger RNA into polypeptide chains. Ribosomes can be found floating in the
cytoplasm or attached to the endoplasmic reticulum. Every living cell requires ribosomes to produce the
, enzymes and structural proteins needed for life. They are composed of both ribosomal RNA and protein
molecules.
5. In DNA, which nitrogenous base always pairs with Cytosine?
A. Adenine
B. Guanine
C. Uracil
D. Thymine
Ans: B
Explanation: DNA base pairing rules state that cytosine always forms hydrogen bonds with guanine. This
specific pairing ensures the double helix maintains a constant width. These complementary base pairs
allow DNA to be replicated accurately during the cell cycle. Adenine pairs with thymine in DNA but with
uracil in RNA. This chemical affinity is the basis of genetic information storage.
6. Which of the following is a characteristic of prokaryotic cells?
A. Presence of mitochondria
B. Lack of a nucleus
C. Large size
D. Complex organelles
Ans: B
Explanation: Prokaryotic cells are characterized by the absence of a membrane-bound nucleus. Their
genetic material is located in a region called the nucleoid. They also lack most of the specialized
