Regenerative Medicine — MCQs
Which of the following cell types is classified as a labile cell?
Regeneration is characterized by:
Prader-Willi syndrome and Angelman syndrome are examples of what genetic phenomenon?
Which of the following substances is a growth factor that is capable of inducing all the steps necessary for angiogenesis?
Stem cells in skin are found in all, EXCEPT:
Which of the following statements is TRUE about osteoblasts and chondroblasts?
Statement 1 - A 59-year-old patient presents with flaccid bullae. Histopathology shows a suprabasal acantholytic split. Statement 2 - The row of tombstones appearance is diagnostic of Pemphigus vulgaris.
A 45-year-old man presents with a history of frequent falls. He has difficulty in looking down also. What is the most probable diagnosis -
40-year-old patient having arthritis of PIP and DIP along with carpometacarpal joint of thumb and sparing of wrist and metacarpophalangeal joint, most likely diagnosis is
A hospital implements blockchain technology for maintaining electronic health records. Compared to traditional centralized database systems, what is the primary advantage that justifies this innovation from a healthcare quality perspective?
Regenerative Medicine Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following cell types is classified as a labile cell?
- A. Liver parenchymal cells
- B. Vascular smooth muscle cells
- C. Surface epithelium (Correct Answer)
- D. Neurons
Explanation: ***Surface epithelium*** - Surface epithelium is classified as **labile tissue**, meaning it undergoes constant regeneration due to its high turnover rate [1]. - Cells in this tissue are typically found in areas that experience frequent damage or abrasion, such as the skin and lining of the intestines. *Cardiac cell* - Cardiac cells are considered **permanent cells**, as they do not undergo significant regeneration after injury or damage. - Damage to cardiac cells typically leads to **fibrosis** rather than repair of the original tissue. *Liver parenchymal cell* - Liver parenchymal cells are categorized as **stable cells**, which can regenerate but do so under specific circumstances, such as injury. - They have a slower turnover rate compared to labile cells and do not constantly renew under normal conditions. *Vascular endothelial cells* - Vascular endothelial cells are considered **stable cells** as well, typically maintaining a stable population but capable of regeneration following injury. - They do not have the same rapid turnover and regeneration capability as labile cells do, especially under normal physiological conditions. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 113-115.
Question 2: Regeneration is characterized by:
- A. Granulation tissue
- B. Repairing by different type of tissue
- C. Cellular proliferation is largely regulated by biochemical factors
- D. Repairing by same type of tissue (Correct Answer)
Explanation: ***Repairing by same type of tissue*** - **Regeneration** involves the replacement of damaged cells and tissues with cells of the **same type**, leading to a complete restoration of normal structure and function [1]. - This process is seen in tissues with high proliferative capacity, like the **epidermis** or the **liver**, following injury [2]. *Granulation tissue* - **Granulation tissue** is characteristic of **repair by fibrosis** (scar formation), not regeneration [1]. - It consists of proliferating fibroblasts, new blood vessels (angiogenesis), and inflammatory cells, which eventually mature into a fibrous scar. *Repairing by different type of tissue* - The replacement of damaged tissue with a **different type of tissue** (typically fibrous connective tissue) is known as **repair by fibrosis** or **scar formation** [1]. - This occurs when the tissue's regenerative capacity is limited or when the injury is severe, resulting in the loss of normal tissue architecture and function [3]. *Cellular proliferation is largely regulated by biochemical factors* - While **cellular proliferation** is indeed regulated by **biochemical factors** (growth factors, cytokines) in both regeneration and repair, this statement describes a mechanism common to cellular growth and healing in general, not a defining characteristic unique to regeneration [1]. - This regulation guides both the replacement with original tissue (regeneration) and scar formation, so it's not specific enough to define regeneration alone. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 113-115. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 112-113. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 113.
Question 3: Prader-Willi syndrome and Angelman syndrome are examples of what genetic phenomenon?
- A. Gene Knockout
- B. Impaired DNA repair
- C. Genomic Imprinting (Correct Answer)
- D. RNA interference
Explanation: ***Genomic Imprinting*** - **Genomic imprinting** is an epigenetic phenomenon where certain genes are expressed in a **parent-of-origin-specific manner**. - In Prader-Willi syndrome, the disease results from the loss of function of specific genes on chromosome 15 (15q11-q13) inherited from the father, while Angelman syndrome results from the loss of function of a different gene (UBE3A) in the same region, but inherited from the mother. *RNA interference* - **RNA interference** is a biological process in which RNA molecules inhibit gene expression or translation, by neutralizing targeted mRNA molecules. - This process is not directly responsible for the parent-of-origin-specific expression patterns observed in these syndromes. *Gene Knockout* - A **gene knockout** is a genetic technique in which an organism's genes are made inoperative. - While it involves modifying gene function, it does not explain the differential expression based on parental origin. *Impaired DNA repair* - **Impaired DNA repair** refers to defects in the mechanisms that correct DNA damage. - This can lead to increased mutations and conditions like cancer, but it is not the underlying mechanism for Prader-Willi or Angelman syndromes.
Question 4: Which of the following substances is a growth factor that is capable of inducing all the steps necessary for angiogenesis?
- A. TGF -a
- B. PDGF
- C. EGF
- D. Basic fibroblast growth factor (Correct Answer)
Explanation: ***Basic fibroblast growth factor*** - **Basic fibroblast growth factor (bFGF or FGF2)** is a potent inducer of **angiogenesis**, promoting endothelial cell proliferation, migration, and tube formation. - It plays a crucial role in **wound healing** and **tumor growth** by stimulating the development of new blood vessels. *TGF-α* - **TGF-alpha** primarily acts as a **mitogen** for epithelial cells and fibroblasts, promoting cell growth and differentiation. - While it can indirectly influence angiogenesis, it does not directly induce all steps of the process like bFGF. *PDGF* - **Platelet-derived growth factor (PDGF)** is a mitogen for **fibroblasts, smooth muscle cells, and glial cells**, involved in wound healing and tissue remodeling. - Its primary role in angiogenesis is thought to be in the **stabilization of new vessels** by recruiting pericytes and smooth muscle cells, rather than initiating new vessel formation. *EGF* - **Epidermal growth factor (EGF)** primarily stimulates the **proliferation and differentiation of epidermal and epithelial cells**. - While it contributes to tissue repair and cell growth, its direct role in inducing all stages of angiogenesis is less prominent compared to bFGF.
Question 5: Stem cells in skin are found in all, EXCEPT:
- A. Hair follicle
- B. Sebaceous glands
- C. Sweat glands
- D. Stratum corneum (Correct Answer)
Explanation: ***Stratum corneum*** - The **stratum corneum** is the outermost layer of the epidermis consisting of **dead, anucleated keratinocytes** (corneocytes) that have undergone terminal differentiation [1]. - This layer contains **no viable cells** and therefore **no stem cells**, as it is composed entirely of flattened, keratinized cells that serve as a protective barrier [1]. - Stem cells require viable cellular machinery for self-renewal and differentiation, which is absent in this dead layer. *Hair follicle* - The **hair follicle bulge** region contains a population of multipotent **stem cells** responsible for hair regeneration and contributing to epidermal repair [1]. - These stem cells can differentiate into various cell types, including keratinocytes, sebocytes, and pigment cells [1]. *Sebaceous glands* - **Stem cells** are located in the **basal layer of sebaceous glands** and contribute to the maintenance and repair of the gland [1]. - These cells facilitate the continuous production of sebum and the structural integrity of the gland. *Sweat glands* - **Stem cells** are present in the **sweat glands**, particularly in the ductal regions, and play a role in the regeneration and repair of this glandular tissue [1]. - They are important for maintaining the function of eccrine and apocrine glands [1].
Question 6: Which of the following statements is TRUE about osteoblasts and chondroblasts?
- A. Derived from mesenchymal stem cells. (Correct Answer)
- B. Osteoblasts and chondroblasts are terminally differentiated cells.
- C. Osteoblasts and chondroblasts communicate via gap junctions.
- D. Osteoblasts and chondroblasts are both found in lacunae.
Explanation: ***Derived from mesenchymal stem cells*** - Both **osteoblasts** (bone-forming cells) and **chondroblasts** (cartilage-forming cells) originate from **mesenchymal stem cells**, which are multipotent stromal cells [2]. - These stem cells can differentiate into various connective tissue cells, including those responsible for building bone and cartilage [3]. *Osteoblasts and chondroblasts are terminally differentiated cells.* - Osteoblasts can further differentiate into **osteocytes** once they become embedded in the bone matrix, while chondroblasts can mature into **chondrocytes** [1]. - While they undergo differentiation, the term "terminally differentiated" usually implies a cell that has reached its final development stage and cannot differentiate further, which is not entirely accurate for osteoblasts before becoming osteocytes. *Osteoblasts and chondroblasts communicate via gap junctions.* - **Osteocytes**, not osteoblasts, communicate via **gap junctions** through their cytoplasmic processes within the bone matrix. - Chondrocytes (mature chondroblasts) in cartilage are generally isolated within the matrix and do not extensively form gap junctions for direct cell-to-cell communication. *Osteoblasts and chondroblasts are both found in lacunae.* - **Chondrocytes** (mature chondroblasts) are typically found in **lacunae** within the cartilage matrix. - **Osteocytes** (mature osteoblasts) are found in lacunae within the bone matrix, but **osteoblasts** themselves are typically found on the surface of developing bone, laying down new matrix, not within lacunae [1].
Question 7: Statement 1 - A 59-year-old patient presents with flaccid bullae. Histopathology shows a suprabasal acantholytic split. Statement 2 - The row of tombstones appearance is diagnostic of Pemphigus vulgaris.
- A. Statements 1 & 2 are correct, 2 is not explaining 1 (Correct Answer)
- B. Statements 1 and 2 are correct and 2 is the correct explanation for 1
- C. Statements 1 and 2 are incorrect
- D. Statement 1 is incorrect
Explanation: ***Correct: Statements 1 & 2 are correct, 2 is not explaining 1*** **Analysis of Statement 1:** - A 59-year-old patient with **flaccid bullae** and **suprabasal acantholytic split** on histopathology is the classic presentation of **Pemphigus vulgaris** - The flaccid (easily ruptured) nature of bullae distinguishes it from tense bullae seen in bullous pemphigoid - The suprabasal location of the split (just above the basal layer) with acantholysis (loss of cell-to-cell adhesion) is pathognomonic - **Statement 1 is CORRECT** ✓ **Analysis of Statement 2:** - The **"row of tombstones" or "tombstone appearance"** is indeed a diagnostic histopathological feature of Pemphigus vulgaris - This appearance results from basal keratinocytes remaining attached to the basement membrane while suprabasal cells separate due to acantholysis - The intact basal cells standing upright resemble a row of tombstones - **Statement 2 is CORRECT** ✓ **Does Statement 2 explain Statement 1?** - Statement 2 describes a **histopathological appearance** (tombstone pattern) that is a **consequence** of the suprabasal split - However, it does NOT explain the **underlying cause** of the flaccid bullae or the suprabasal split - The true explanation involves **IgG autoantibodies against desmoglein 3 (and desmoglein 1)**, which attack intercellular adhesion structures (desmosomes), causing **acantholysis** - Therefore, **Statement 2 does NOT explain Statement 1** ✗ *Incorrect: Statement 2 is the correct explanation for Statement 1* - While both statements describe features of Pemphigus vulgaris, the tombstone appearance is a descriptive finding, not an explanatory mechanism *Incorrect: Statements 1 and 2 are incorrect* - Both statements are medically accurate descriptions of Pemphigus vulgaris features *Incorrect: Statement 1 is incorrect* - Statement 1 correctly describes the cardinal clinical and histopathological features of Pemphigus vulgaris
Question 8: A 45-year-old man presents with a history of frequent falls. He has difficulty in looking down also. What is the most probable diagnosis -
- A. Alzheimer's disease
- B. Normal pressure hydro-cephalus
- C. Parkinson's disease
- D. Progressive supranuclear palsy (Correct Answer)
Explanation: ***Progressive supranuclear palsy*** - The combination of **frequent falls** and **difficulty looking down** (supranuclear ophthalmoplegia, especially affecting vertical gaze) is a classic presentation of progressive supranuclear palsy (PSP). - PSP is a **tauopathy** characterized by **postural instability**, early falls, and distinctive ocular motor dysfunction. *Alzheimer's disease* - Primarily presents with **progressive memory loss** and cognitive decline, not typically early or prominent falls or vertical gaze palsy. - While falls can occur in later stages, they are not usually an initial hallmark symptom associated with restricted eye movements. *Normal pressure hydrocephalus* - Characterized by the triad of **gait disturbance** (often described as magnetic gait), **urinary incontinence**, and **dementia** [2]. - While gait disturbance can lead to falls, the specific difficulty in looking down is not a feature of NPH. *Parkinson's disease* - Characterized by **bradykinesia**, **rigidity**, **tremor**, and **postural instability** leading to falls later in the disease [1]. - However, difficulty looking down (vertical gaze palsy) is not a typical feature of Parkinson's disease, and falls tend to occur later in the disease course compared to PSP.
Question 9: 40-year-old patient having arthritis of PIP and DIP along with carpometacarpal joint of thumb and sparing of wrist and metacarpophalangeal joint, most likely diagnosis is
- A. osteoarthritis (Correct Answer)
- B. pseudo gout
- C. psoriatic arthritis
- D. rheumatoid arthritis
Explanation: ***Osteoarthritis*** - This classic presentation of arthritis in the **PIP, DIP**, and **first carpometacarpal (CMC) joint** with sparing of the wrist and MCP joints is highly characteristic of **osteoarthritis** [1]. - **Osteoarthritis** primarily affects cartilage and bone, leading to pain and stiffness, and commonly involves these specific hand joints [1]. *Pseudo gout* - Pseudo gout, or **calcium pyrophosphate deposition disease (CPPD)**, typically causes acute, monoarticular or oligoarticular arthritis, often affecting larger joints like the knee or wrist [3]. - While it can affect the hand, its presentation is usually more acute and less chronic, and it does not typically show the joint distribution described here. *Psoriatic arthritis* - **Psoriatic arthritis** can affect the DIP joints and can cause a "sausage digit" (dactylitis), but it often also involves the wrist or other joints, and skin/nail changes of psoriasis would typically be present. - While it can involve the DIP joints, the classic sparing of wrist and MCP for this specific pattern is less typical for psoriatic arthritis compared to osteoarthritis. *Rheumatoid arthritis* - **Rheumatoid arthritis** typically affects the **MCP joints** and **wrists symmetrically**, often sparing the DIP joints [2]. - The presented pattern of joint involvement, especially the sparing of the MCP and wrist joints and involvement of the DIP and CMC joints, makes rheumatoid arthritis unlikely [2].
Question 10: A hospital implements blockchain technology for maintaining electronic health records. Compared to traditional centralized database systems, what is the primary advantage that justifies this innovation from a healthcare quality perspective?
- A. Faster data retrieval for clinical decision-making
- B. Enhanced data integrity through immutable distributed ledger (Correct Answer)
- C. Reduced storage costs due to distributed architecture
- D. Simplified user interface for healthcare providers
Explanation: ***Enhanced data integrity through immutable distributed ledger*** - The primary feature of **blockchain** is its **immutability**, meaning once a record is added to the ledger, it cannot be altered without consensus from the network. - This ensures **data integrity** and creates a permanent, transparent **audit trail**, which is critical for reducing medical errors and preventing unauthorized tampering with health records. *Faster data retrieval for clinical decision-making* - Blockchain architecture often involves **consensus protocols** and distributed verification, which can actually make data retrieval or processing **slower** than traditional centralized databases. - The innovation's value lies in **security and trust**, not necessarily in the raw speed of clinical inquiry compared to high-speed SQL databases. *Reduced storage costs due to distributed architecture* - In a blockchain, the ledger is **replicated** across multiple nodes, which typically leads to **higher storage requirements** and costs rather than lower ones. - Each participating node must maintain a copy of the transactions, making the architecture inherently **more expensive** in terms of data redundancy. *Simplified user interface for healthcare providers* - Blockchain is a **back-end infrastructure** technology and does not inherently influence or improve the **user interface (UI)** or front-end experience. - The complexity of managing **cryptographic keys** can sometimes make the system more difficult for non-technical users to navigate compared to traditional systems.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free