BIOS 255 EXAM 1 QUESTIONS AND CORRECT
ANSWERS (VERFIED ANSWERS) Q&A 2027
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1. Which statement best describes the basic unit of life?
A. Tissue
B. Organ
C. Cell
D. Organ system
Answer: C. Cell
Rationale: The cell is the smallest structural and functional unit
capable of carrying out life processes.
2. Which characteristic is shared by all living organisms?
A. Ability to photosynthesize
B. Cellular organization
C. Ability to move from place to place
D. Production of flowers
Answer: B. Cellular organization
Rationale: All living organisms consist of one or more cells.
3. Which organelle is primarily responsible for producing ATP
in eukaryotic cells?
,A. Ribosome
B. Lysosome
C. Mitochondrion
D. Golgi apparatus
Answer: C. Mitochondrion
Rationale: Mitochondria generate most cellular ATP through
aerobic cellular respiration.
4. Which structure controls what enters and leaves a cell?
A. Cell wall
B. Plasma membrane
C. Nucleolus
D. Cytoskeleton
Answer: B. Plasma membrane
Rationale: The plasma membrane is selectively permeable and
regulates movement of substances into and out of the cell.
5. What is the primary function of ribosomes?
A. ATP production
B. Protein synthesis
C. Lipid storage
D. DNA replication
,Answer: B. Protein synthesis
Rationale: Ribosomes translate mRNA sequences into
polypeptide chains.
6. Which organelle contains most of a eukaryotic cell's DNA?
A. Nucleus
B. Lysosome
C. Golgi apparatus
D. Centriole
Answer: A. Nucleus
Rationale: The nucleus houses the majority of the genetic
material in eukaryotic cells.
7. Which type of molecule is composed of amino acids?
A. Carbohydrate
B. Lipid
C. Protein
D. Nucleic acid
Answer: C. Protein
Rationale: Amino acids are the monomers that form proteins.
8. What is the main function of carbohydrates in cells?
, A. Immediate and stored energy
B. Genetic information storage only
C. Enzyme production only
D. Oxygen transport
Answer: A. Immediate and stored energy
Rationale: Carbohydrates such as glucose provide readily
available energy, while polysaccharides can serve as energy
stores.
9. Which element is characteristic of all organic molecules?
A. Sodium
B. Carbon
C. Iron
D. Calcium
Answer: B. Carbon
Rationale: Organic compounds are carbon-based molecules
associated with living systems.
10. What is the monomer of DNA?
A. Amino acid
B. Fatty acid
C. Nucleotide
D. Monosaccharide
ANSWERS (VERFIED ANSWERS) Q&A 2027
|INSTANT DOWNLOAD PDF
1. Which statement best describes the basic unit of life?
A. Tissue
B. Organ
C. Cell
D. Organ system
Answer: C. Cell
Rationale: The cell is the smallest structural and functional unit
capable of carrying out life processes.
2. Which characteristic is shared by all living organisms?
A. Ability to photosynthesize
B. Cellular organization
C. Ability to move from place to place
D. Production of flowers
Answer: B. Cellular organization
Rationale: All living organisms consist of one or more cells.
3. Which organelle is primarily responsible for producing ATP
in eukaryotic cells?
,A. Ribosome
B. Lysosome
C. Mitochondrion
D. Golgi apparatus
Answer: C. Mitochondrion
Rationale: Mitochondria generate most cellular ATP through
aerobic cellular respiration.
4. Which structure controls what enters and leaves a cell?
A. Cell wall
B. Plasma membrane
C. Nucleolus
D. Cytoskeleton
Answer: B. Plasma membrane
Rationale: The plasma membrane is selectively permeable and
regulates movement of substances into and out of the cell.
5. What is the primary function of ribosomes?
A. ATP production
B. Protein synthesis
C. Lipid storage
D. DNA replication
,Answer: B. Protein synthesis
Rationale: Ribosomes translate mRNA sequences into
polypeptide chains.
6. Which organelle contains most of a eukaryotic cell's DNA?
A. Nucleus
B. Lysosome
C. Golgi apparatus
D. Centriole
Answer: A. Nucleus
Rationale: The nucleus houses the majority of the genetic
material in eukaryotic cells.
7. Which type of molecule is composed of amino acids?
A. Carbohydrate
B. Lipid
C. Protein
D. Nucleic acid
Answer: C. Protein
Rationale: Amino acids are the monomers that form proteins.
8. What is the main function of carbohydrates in cells?
, A. Immediate and stored energy
B. Genetic information storage only
C. Enzyme production only
D. Oxygen transport
Answer: A. Immediate and stored energy
Rationale: Carbohydrates such as glucose provide readily
available energy, while polysaccharides can serve as energy
stores.
9. Which element is characteristic of all organic molecules?
A. Sodium
B. Carbon
C. Iron
D. Calcium
Answer: B. Carbon
Rationale: Organic compounds are carbon-based molecules
associated with living systems.
10. What is the monomer of DNA?
A. Amino acid
B. Fatty acid
C. Nucleotide
D. Monosaccharide
