URS 6030 EXAM 1 | 653
N
Questions and Answers | Complete
Solution | Graduate Nursing |
Advanced Practice | Pass
Guaranteed - A+ Graded
**[DOMAIN 1: CELLULAR BIOLOGY, ADAPTATION & INJURY - 120 Questions]**
**1.1 Cell Structure & Function (Questions 1-30)**
* *Question 1:** Which cellular structure is described as a semipermeable lipid bilayer that
separates intra- and extracellular environments, provides receptors for hormones, conducts
electric currents, and enables cell-to-cell recognition?
. Cytoplasm
A
B. Cell membrane **[CORRECT]**
C. Nucleus
D. Cytoskeleton
* *Rationale:** The cell membrane (plasma membrane) is composed of a phospholipid bilayer
with embedded proteins that serve as receptors, ion channels, and recognition sites. Its
semipermeable nature regulates substance transport while maintaining cellular integrity and
communication.
* *Question 2:** A nurse is reviewing cellular anatomy. Which organelle is correctly matched with
its function?
. Mitochondria - Site of protein synthesis
A
B. Ribosomes - Power plants of the cell
C. Golgi apparatus - Packages proteins and enzymes **[CORRECT]**
D. Lysosomes - Major site of lipid synthesis
* *Rationale:** The Golgi apparatus works in conjunction with the endoplasmic reticulum to
modify, package, and distribute proteins, enzymes, and hormones. Mitochondria are the "power
, lants" (ATP production), ribosomes synthesize proteins, and the smooth ER is the major site of
p
lipid synthesis.
* *Question 3:** Which cellular component maintains cell shape using microtubules and
microfilaments?
. Cytoplasm
A
B. Nucleus
C. Cytoskeleton **[CORRECT]**
D. Proteasome
* *Rationale:** The cytoskeleton is a network of protein filaments (microtubules and
microfilaments) that provides structural support, maintains cell shape, enables cell movement,
and facilitates intracellular transport.
* *Question 4:** The rough endoplasmic reticulum is characterized by which feature and
function?
. Lacks ribosomes; major site of lipid synthesis
A
B. Covered in ribosomes; synthesizes and transports proteins and glycoproteins
**[CORRECT]**
C. Contains digestive enzymes; breaks down cell parts
D. Self-replicating; transforms compounds into ATP
* *Rationale:** The rough ER is studded with ribosomes on its cytoplasmic surface, giving it a
"rough" appearance. These ribosomes synthesize proteins that enter the ER lumen for
processing and transport. The smooth ER lacks ribosomes and synthesizes lipids.
* *Question 5:** Which organelle serves as the "quality control" of the cell and is involved in
programmed cell death?
. Lysosome
A
B. Proteasome **[CORRECT]**
C. Mitochondria
D. Golgi apparatus
* *Rationale:** Proteasomes degrade unneeded or damaged proteins through proteolysis,
functioning as cellular quality control. They also play a role in apoptosis by degrading regulatory
proteins. Lysosomes break down cellular debris and foreign substances, while mitochondria
regulate apoptosis through cytochrome c release.
* *Question 6:** Which cellular organelle transforms organic compounds into ATP, is
self-replicating, and regulates apoptosis?
, . Rough endoplasmic reticulum
A
B. Smooth endoplasmic reticulum
C. Mitochondria **[CORRECT]**
D. Lysosomes
* *Rationale:** Mitochondria generate ATP through oxidative phosphorylation, contain their own
DNA (maternal inheritance), replicate independently of cell division, and play a central role in
regulating apoptosis through the intrinsic pathway.
**Question 7:** The nucleus is responsible for which functions? (Select all that apply)
. Contains DNA and chromatin
A
B. Site of RNA synthesis
C. Contains the nucleolus
D. Surrounded by nuclear envelope
E. All of the above **[CORRECT]**
* *Rationale:** The nucleus houses the cell's genetic material (DNA organized as chromatin), is
the site of transcription (RNA synthesis), contains the nucleolus where ribosomal RNA is
produced, and is enclosed by a double-membrane nuclear envelope with nuclear pores.
* *Question 8:** Which organelle uses digestive enzymes to break down worn-out cell parts and
foreign substances?
. Proteasome
A
B. Mitochondria
C. Lysosomes **[CORRECT]**
D. Ribosomes
* *Rationale:** Lysosomes contain hydrolytic enzymes (acid hydrolases) that digest cellular
debris, damaged organelles, and phagocytosed pathogens. They maintain an acidic pH
(approximately 4.5-5.0) optimal for enzyme function.
* *Question 9:** A patient presents with a genetic disorder affecting the organelle responsible for
protein synthesis. Which organelle is defective?
. Golgi apparatus
A
B. Ribosomes **[CORRECT]**
C. Mitochondria
D. Smooth ER
* *Rationale:** Ribosomes are the cellular sites of translation, where mRNA is decoded to
synthesize proteins. They exist free in the cytoplasm or bound to the rough ER. Defects in
ribosomal function can cause various ribosomopathies.
, **Question 10:** Which statement about the smooth endoplasmic reticulum is correct?
. It is covered with ribosomes
A
B. It is the major site of lipid synthesis **[CORRECT]**
C. It synthesizes and transports proteins
D. It packages proteins and enzymes
* *Rationale:** The smooth ER lacks ribosomes and is primarily involved in lipid synthesis,
steroid hormone production, calcium storage, and detoxification of drugs and poisons. The
rough ER performs protein synthesis.
* *Question 11:** Which cellular component is described as a colloid solution inside the cell
surrounding organelles?
. Cell membrane
A
B. Cytoplasm **[CORRECT]**
C. Nucleoplasm
D. Cytosol
* *Rationale:** Cytoplasm refers to the entire content within the cell membrane, excluding the
nucleus. It consists of cytosol (the gel-like colloid solution) plus organelles. Cytosol specifically
refers to the liquid component alone.
* *Question 12:** During cellular stress, which organelle is responsible for initiating the intrinsic
pathway of apoptosis?
. Lysosomes
A
B. Mitochondria **[CORRECT]**
C. Ribosomes
D. Golgi apparatus
* *Rationale:** Mitochondria initiate the intrinsic apoptotic pathway by releasing cytochrome c
and other pro-apoptotic factors in response to cellular stress, DNA damage, or growth factor
deprivation, activating caspase cascades.
**Question 13:** Which statement about lysosomal function is accurate?
. Lysosomes function optimally at neutral pH
A
B. Lysosomes contain proteolytic enzymes that function best in acidic environments
**[CORRECT]**
C. Lysosomes synthesize proteins for export from the cell
D. Lysosomes generate ATP through oxidative phosphorylation
N
Questions and Answers | Complete
Solution | Graduate Nursing |
Advanced Practice | Pass
Guaranteed - A+ Graded
**[DOMAIN 1: CELLULAR BIOLOGY, ADAPTATION & INJURY - 120 Questions]**
**1.1 Cell Structure & Function (Questions 1-30)**
* *Question 1:** Which cellular structure is described as a semipermeable lipid bilayer that
separates intra- and extracellular environments, provides receptors for hormones, conducts
electric currents, and enables cell-to-cell recognition?
. Cytoplasm
A
B. Cell membrane **[CORRECT]**
C. Nucleus
D. Cytoskeleton
* *Rationale:** The cell membrane (plasma membrane) is composed of a phospholipid bilayer
with embedded proteins that serve as receptors, ion channels, and recognition sites. Its
semipermeable nature regulates substance transport while maintaining cellular integrity and
communication.
* *Question 2:** A nurse is reviewing cellular anatomy. Which organelle is correctly matched with
its function?
. Mitochondria - Site of protein synthesis
A
B. Ribosomes - Power plants of the cell
C. Golgi apparatus - Packages proteins and enzymes **[CORRECT]**
D. Lysosomes - Major site of lipid synthesis
* *Rationale:** The Golgi apparatus works in conjunction with the endoplasmic reticulum to
modify, package, and distribute proteins, enzymes, and hormones. Mitochondria are the "power
, lants" (ATP production), ribosomes synthesize proteins, and the smooth ER is the major site of
p
lipid synthesis.
* *Question 3:** Which cellular component maintains cell shape using microtubules and
microfilaments?
. Cytoplasm
A
B. Nucleus
C. Cytoskeleton **[CORRECT]**
D. Proteasome
* *Rationale:** The cytoskeleton is a network of protein filaments (microtubules and
microfilaments) that provides structural support, maintains cell shape, enables cell movement,
and facilitates intracellular transport.
* *Question 4:** The rough endoplasmic reticulum is characterized by which feature and
function?
. Lacks ribosomes; major site of lipid synthesis
A
B. Covered in ribosomes; synthesizes and transports proteins and glycoproteins
**[CORRECT]**
C. Contains digestive enzymes; breaks down cell parts
D. Self-replicating; transforms compounds into ATP
* *Rationale:** The rough ER is studded with ribosomes on its cytoplasmic surface, giving it a
"rough" appearance. These ribosomes synthesize proteins that enter the ER lumen for
processing and transport. The smooth ER lacks ribosomes and synthesizes lipids.
* *Question 5:** Which organelle serves as the "quality control" of the cell and is involved in
programmed cell death?
. Lysosome
A
B. Proteasome **[CORRECT]**
C. Mitochondria
D. Golgi apparatus
* *Rationale:** Proteasomes degrade unneeded or damaged proteins through proteolysis,
functioning as cellular quality control. They also play a role in apoptosis by degrading regulatory
proteins. Lysosomes break down cellular debris and foreign substances, while mitochondria
regulate apoptosis through cytochrome c release.
* *Question 6:** Which cellular organelle transforms organic compounds into ATP, is
self-replicating, and regulates apoptosis?
, . Rough endoplasmic reticulum
A
B. Smooth endoplasmic reticulum
C. Mitochondria **[CORRECT]**
D. Lysosomes
* *Rationale:** Mitochondria generate ATP through oxidative phosphorylation, contain their own
DNA (maternal inheritance), replicate independently of cell division, and play a central role in
regulating apoptosis through the intrinsic pathway.
**Question 7:** The nucleus is responsible for which functions? (Select all that apply)
. Contains DNA and chromatin
A
B. Site of RNA synthesis
C. Contains the nucleolus
D. Surrounded by nuclear envelope
E. All of the above **[CORRECT]**
* *Rationale:** The nucleus houses the cell's genetic material (DNA organized as chromatin), is
the site of transcription (RNA synthesis), contains the nucleolus where ribosomal RNA is
produced, and is enclosed by a double-membrane nuclear envelope with nuclear pores.
* *Question 8:** Which organelle uses digestive enzymes to break down worn-out cell parts and
foreign substances?
. Proteasome
A
B. Mitochondria
C. Lysosomes **[CORRECT]**
D. Ribosomes
* *Rationale:** Lysosomes contain hydrolytic enzymes (acid hydrolases) that digest cellular
debris, damaged organelles, and phagocytosed pathogens. They maintain an acidic pH
(approximately 4.5-5.0) optimal for enzyme function.
* *Question 9:** A patient presents with a genetic disorder affecting the organelle responsible for
protein synthesis. Which organelle is defective?
. Golgi apparatus
A
B. Ribosomes **[CORRECT]**
C. Mitochondria
D. Smooth ER
* *Rationale:** Ribosomes are the cellular sites of translation, where mRNA is decoded to
synthesize proteins. They exist free in the cytoplasm or bound to the rough ER. Defects in
ribosomal function can cause various ribosomopathies.
, **Question 10:** Which statement about the smooth endoplasmic reticulum is correct?
. It is covered with ribosomes
A
B. It is the major site of lipid synthesis **[CORRECT]**
C. It synthesizes and transports proteins
D. It packages proteins and enzymes
* *Rationale:** The smooth ER lacks ribosomes and is primarily involved in lipid synthesis,
steroid hormone production, calcium storage, and detoxification of drugs and poisons. The
rough ER performs protein synthesis.
* *Question 11:** Which cellular component is described as a colloid solution inside the cell
surrounding organelles?
. Cell membrane
A
B. Cytoplasm **[CORRECT]**
C. Nucleoplasm
D. Cytosol
* *Rationale:** Cytoplasm refers to the entire content within the cell membrane, excluding the
nucleus. It consists of cytosol (the gel-like colloid solution) plus organelles. Cytosol specifically
refers to the liquid component alone.
* *Question 12:** During cellular stress, which organelle is responsible for initiating the intrinsic
pathway of apoptosis?
. Lysosomes
A
B. Mitochondria **[CORRECT]**
C. Ribosomes
D. Golgi apparatus
* *Rationale:** Mitochondria initiate the intrinsic apoptotic pathway by releasing cytochrome c
and other pro-apoptotic factors in response to cellular stress, DNA damage, or growth factor
deprivation, activating caspase cascades.
**Question 13:** Which statement about lysosomal function is accurate?
. Lysosomes function optimally at neutral pH
A
B. Lysosomes contain proteolytic enzymes that function best in acidic environments
**[CORRECT]**
C. Lysosomes synthesize proteins for export from the cell
D. Lysosomes generate ATP through oxidative phosphorylation
