Biochemistry
1 questionsWhich is not a product of heme catabolism?
INI-CET 2024 - Biochemistry INI-CET Practice Questions and MCQs
Question 31: Which is not a product of heme catabolism?
- A. Aminolevulinic acid (Correct Answer)
- B. Ferrous ion
- C. Biliverdin
- D. Carbon monoxide
Explanation: ***Aminolevulinic acid*** - **Aminolevulinic acid (ALA)** is a precursor in the **heme biosynthetic pathway**, not a product of its degradation. - The formation of ALA is the **rate-limiting step** in heme synthesis, catalyzed by ALA synthase. *Ferrous ion* - During heme catabolism, the **iron atom (Fe2+)** is released from the porphyrin ring. - This **ferrous ion** is then recycled or stored, as it is a product of heme degradation. *Biliverdin* - **Biliverdin** is the first green-colored product formed when heme oxygenase cleaves the **porphyrin ring** of heme. - It is an intermediate in the conversion of heme to **bilirubin**, making it a direct product of heme catabolism. *Carbon monoxide* - The oxidative cleavage of the heme ring by **heme oxygenase** liberates one molecule of **carbon monoxide (CO)**. - This CO is an important signaling molecule and has vasodilatory effects, making it a product of heme degradation.
ENT
1 questionsA 13-year-old boy presents with right-sided nasal obstruction and recurrent epistaxis for the past 6 months. What is the most likely diagnosis?
INI-CET 2024 - ENT INI-CET Practice Questions and MCQs
Question 31: A 13-year-old boy presents with right-sided nasal obstruction and recurrent epistaxis for the past 6 months. What is the most likely diagnosis?
- A. JNA (Correct Answer)
- B. Coagulation disorder
- C. Antrochoanal polyp
- D. Allergic rhinitis
Explanation: ***JNA (Juvenile Nasopharyngeal Angiofibroma)*** - **Classic presentation**: Adolescent male with **unilateral nasal obstruction** and **recurrent, often profuse epistaxis** - JNA is a **highly vascular benign tumor** that predominantly affects males aged 10-18 years - Though benign, it is **locally aggressive** and can extend into adjacent structures (orbit, skull base) - The combination of age, gender, unilateral symptoms, and recurrent epistaxis makes this the most likely diagnosis *Coagulation disorder* - Would cause **generalized bleeding tendencies**, not localized unilateral nasal obstruction - Epistaxis would typically be **bilateral** and associated with other bleeding manifestations (easy bruising, gum bleeding, prolonged bleeding from cuts) - No mass effect or persistent obstruction would be expected - Other systemic bleeding signs are absent in this presentation *Antrochoanal polyp* - **Benign inflammatory lesion** originating from maxillary sinus, extending through ostium into choana - Can cause nasal obstruction but epistaxis is **much less common and less severe** than in JNA - More commonly associated with **chronic sinusitis symptoms** (rhinorrhea, postnasal drip, facial pressure) - Less vascular than JNA, so recurrent profuse epistaxis would be unusual *Allergic rhinitis* - Characterized by **bilateral symptoms**: nasal obstruction, sneezing, rhinorrhea, and nasal itching - Often has **seasonal pattern** or clear allergen triggers - May cause minor epistaxis from mucosal irritation, but not the **severe recurrent epistaxis** seen here - **Unilateral** persistent obstruction would be atypical for allergic rhinitis
Forensic Medicine
1 questionsDuring autopsy of a fetal death case, what is the correct order of examination to differentiate between live birth and stillbirth?
INI-CET 2024 - Forensic Medicine INI-CET Practice Questions and MCQs
Question 31: During autopsy of a fetal death case, what is the correct order of examination to differentiate between live birth and stillbirth?
- A. Thorax > head > abdomen
- B. Abdomen > thorax > head
- C. Thorax > abdomen > head
- D. Head > thorax > abdomen (Correct Answer)
Explanation: ***Head > thorax > abdomen*** - The **head** is examined first to preserve delicate structures and avoid artifactual changes that could obscure signs of **intrauterine pathology** or **trauma** related to birth. - After the head, the **thorax** is examined to assess the lungs for signs of **air insufflation** (indicating respiration) and the presence of **congenital anomalies** or injuries. *Thorax > head > abdomen* - Examining the **thorax** before the head may introduce artifacts to the head, such as **hemorrhage** or **tissue distortion**, compromising the investigation of **cephalic injuries** or malformations crucial for distinguishing **live birth** from **stillbirth**. - **Head injuries** or **intracranial bleeds** are often critical in determining the mode of delivery or potential trauma, so their undisturbed assessment is prioritized. *Abdomen > thorax > head* - Beginning with the **abdomen** risks significant disruption to the **thoracic** and **cephalic** structures as a consequence of handling and evisceration, potentially obscuring vital evidence of **respiration** or **birth trauma**. - The integrity of the **head** and **thorax** is paramount for identifying subtle macroscopic and microscopic findings that definitively point to a **live birth**, such as **pulmonary aeration** or **intracranial hemorrhages**. *Thorax > abdomen > head* - This sequence is suboptimal because starting with the **thorax** and then the **abdomen** still leaves the **head** vulnerable to post-mortem changes and handling artifacts due to the initial dissections. - Critical evidence in the head pertaining to **neurological insult** or **traumatic injury** during birth might be overlooked or misinterpreted if not examined early in a pristine state.
Internal Medicine
2 questionsIn folate deficiency, which of the following statements is true?
A male patient with purple striae, thin skin, non-healing wound, and pedunculated abdomen, most probable cause?
INI-CET 2024 - Internal Medicine INI-CET Practice Questions and MCQs
Question 31: In folate deficiency, which of the following statements is true?
- A. B12 supplementation is recommended along with folate
- B. Purine and pyrimidine synthesis are affected
- C. Hemolytic anemia is not a feature
- D. Elevated homocysteine & normal methylmalonic acid (Correct Answer)
Explanation: ***Elevated homocysteine & normal methylmalonic acid*** - In **folate deficiency**, the conversion of homocysteine to methionine is impaired, leading to **elevated homocysteine** levels. - Unlike vitamin B12 deficiency, **methylmalonic acid (MMA)** levels remain normal in folate deficiency because folate is not involved in its metabolism. *B12 supplementation is recommended along with folate* - Supplementation with B12 alongside folate is crucial when **macrocytic anemia** is diagnosed, as it can mask a coexisting **B12 deficiency**, potentially worsening neurological symptoms if only folate is given. - However, in confirmed isolated folate deficiency, B12 supplementation is not strictly necessary unless there is suspicion or diagnosis of co-existing B12 deficiency. *Purine and pyrimidine synthesis are affected* - While folate is essential for **DNA synthesis**, indirectly affecting purine and pyrimidine production, this statement is a consequence rather than the primary diagnostic or distinguishing feature of folate deficiency. - **Folate** acts as a coenzyme in transferring one-carbon units, vital for the synthesis of **thymidylate** (a pyrimidine base) and **purine precursors**. *Hemolytic anemia is not a feature* - **Hemolytic anemia** is not typically a feature of folate deficiency; instead, it is characterized by **macrocytic, megaloblastic anemia**. - Conditions like **glucose-6-phosphate dehydrogenase (G6PD) deficiency** or **autoimmune disorders** are commonly associated with hemolytic anemia.
Question 32: A male patient with purple striae, thin skin, non-healing wound, and pedunculated abdomen, most probable cause?
- A. Insulin resistance
- B. Hypercortisolism (Correct Answer)
- C. Hypothyroidism
- D. Genetic connective tissue disorder
Explanation: Hypercortisolism - **Purple striae** are characteristic due to the breakdown of collagen and elastic fibers from excessive **cortisol**. - **Thin skin**, **non-healing wounds**, and a **pedunculated abdomen** (central obesity) are all classic signs of chronic high cortisol levels, as seen in **Cushing's syndrome** [1]. *Insulin resistance* - While insulin resistance can lead to conditions like **acanthosis nigricans** and **obesity**, it typically does not cause purple striae or thin skin directly. - It's often associated with **type 2 diabetes**, polycystic ovary syndrome, but not the specific dermatological features presented. *Hypothyroidism* - Hypothyroidism symptoms include **dry skin**, **coarse hair**, **fatigue**, and **weight gain**, but not typically purple striae or thin skin. - It can cause **non-pitting edema** (myxedema), which is distinct from the described skin changes. *Genetic connective tissue disorder* - Genetic connective tissue disorders like **Ehlers-Danlos syndrome** can cause thin, fragile skin and poor wound healing. - However, they do not typically present with the characteristic **purple striae** or **pedunculated abdomen** that point specifically to hypercortisolism.
Obstetrics and Gynecology
1 questionsWhat is the correct dosing regimen of Dexamethasone for promoting fetal lung maturity in preterm infants?
INI-CET 2024 - Obstetrics and Gynecology INI-CET Practice Questions and MCQs
Question 31: What is the correct dosing regimen of Dexamethasone for promoting fetal lung maturity in preterm infants?
- A. Dexamethasone 6 mg - 2 doses every 12 hrly
- B. Betamethasone 12 mg - 2 doses every 24 hrly
- C. Betamethasone 6 mg - 4 doses every 12 hrly
- D. Dexamethasone 6 mg - 4 doses every 12 hrly (Correct Answer)
Explanation: **Dexamethasone 6 mg - 4 doses every 12 hrly** - The standard recommended dosing for **Dexamethasone** to promote fetal lung maturity is **6 mg intramuscularly every 12 hours for a total of four doses.** - This regimen ensures adequate **antenatal corticosteroid** exposure to enhance surfactant production and reduce the incidence and severity of **respiratory distress syndrome** in preterm infants. *Dexamethasone 6 mg - 2 doses every 12 hrly* - This regimen administers only **half the recommended total dose** of Dexamethasone. - It is **insufficient** to achieve the full benefits of antenatal corticosteroids for fetal lung maturity. *Betamethasone 12 mg - 2 doses every 24 hrly* - This is the correct dosing regimen for **Betamethasone**, not Dexamethasone. - While both are antenatal corticosteroids, their dosages and administration schedules differ. *Betamethasone 6 mg - 4 doses every 12 hrly* - This option uses an **incorrect total dose and frequency** for **Betamethasone**. - The standard Betamethasone regimen is 12 mg every 24 hours for two doses.
Pathology
1 questionsER positivity is used as which of the following in the context of breast carcinoma?
INI-CET 2024 - Pathology INI-CET Practice Questions and MCQs
Question 31: ER positivity is used as which of the following in the context of breast carcinoma?
- A. Treatment option
- B. Prognostic marker (Correct Answer)
- C. Molecular marker
- D. Diagnostic marker
Explanation: ***Prognostic marker*** - **ER positivity** in **breast carcinoma** is primarily used as a **prognostic marker** indicating more favorable disease outcome [1]. - ER-positive tumors generally **grow more slowly**, are **less aggressive**, and have **better overall survival** compared to ER-negative tumors [2]. - While ER status also has **predictive value** for endocrine therapy response, its classification as a prognostic indicator reflects its association with inherently better tumor biology and patient outcomes [1]. - ER positivity correlates with **well-differentiated tumors** and **lower grade** malignancies. *Treatment option* - ER positivity is not a treatment itself, but rather a **biomarker** that guides treatment selection. - It identifies patients who may benefit from **endocrine therapy** (tamoxifen, aromatase inhibitors) [1]. *Molecular marker* - While ER is indeed a molecular marker (receptor protein detected by immunohistochemistry), this term is too **broad and non-specific**. - The question asks for the **specific clinical utility** of ER positivity, not its general classification. *Diagnostic marker* - ER status is **not used for initial diagnosis** of breast carcinoma. - Diagnosis requires **histopathological examination** of tissue biopsy. - ER testing is performed **after diagnosis** to characterize the tumor and guide management. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1059-1060. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1064-1066.
Pharmacology
1 questionsA 30-year-old woman has experienced the loss of her newborn. She is currently producing breast milk leading to discomfort and the risk of developing a breast abscess due to milk stasis and incomplete emptying. Which of the following drugs can be used to prevent this complication?
INI-CET 2024 - Pharmacology INI-CET Practice Questions and MCQs
Question 31: A 30-year-old woman has experienced the loss of her newborn. She is currently producing breast milk leading to discomfort and the risk of developing a breast abscess due to milk stasis and incomplete emptying. Which of the following drugs can be used to prevent this complication?
- A. Cabergoline (Correct Answer)
- B. Chlorpromazine
- C. Metoclopramide
- D. Mifepristone
Explanation: ***Cabergoline*** - **Cabergoline** is a dopamine agonist that inhibits prolactin secretion, thereby suppressing lactation and preventing breast engorgement and its complications after childbirth. - It has a longer duration of action compared to bromocriptine, allowing for less frequent dosing and better patient compliance in lactation suppression. *Chlorpromazine* - **Chlorpromazine** is an antipsychotic medication primarily used to treat psychotic disorders; it doesn't suppress lactation. - While it can cause hyperprolactinemia as a side effect due to its antidopaminergic action, it is not used to manage lactation or its complications. *Metoclopramide* - **Metoclopramide** is a dopamine receptor antagonist that *increases* prolactin levels, and is sometimes used to *stimulate* lactation, not suppress it. - It enhances gastrointestinal motility and is primarily used as an antiemetic or for gastric emptying disorders. *Mifepristone* - **Mifepristone** is a progesterone receptor antagonist primarily used for medical abortion and induction of labor. - It is not indicated for the suppression of lactation or the prevention of breast engorgement.
Physiology
2 questionsErythropoietin is secreted by which of the following organs?
Which of the following neurotransmitters is primarily released from the sympathetic nervous system to increase heart rate in response to a DECREASE in blood pressure?
INI-CET 2024 - Physiology INI-CET Practice Questions and MCQs
Question 31: Erythropoietin is secreted by which of the following organs?
- A. Muscle
- B. Kidney (Correct Answer)
- C. Liver
- D. Heart
Explanation: ***Kidney*** - The **kidneys** are the primary site of erythropoietin production in adults, particularly the **peritubular interstitial cells**. - Erythropoietin's main function is to stimulate **red blood cell production** in the bone marrow in response to hypoxia. *Muscle* - Muscles are involved in movement and metabolism but do not produce **erythropoietin**. - They primarily store glycogen and generate force through contraction. *Liver* - The liver produces erythropoietin during **fetal development** but contributes minimally to its production in adulthood. - Its main functions include metabolism, detoxification, and protein synthesis. *Heart* - The heart is responsible for **pumping blood** throughout the body and does not produce **erythropoietin**. - It primarily consists of cardiac muscle tissue.
Question 32: Which of the following neurotransmitters is primarily released from the sympathetic nervous system to increase heart rate in response to a DECREASE in blood pressure?
- A. Norepinephrine (Correct Answer)
- B. Dopamine
- C. Acetylcholine
- D. Epinephrine
Explanation: ***Norepinephrine*** - **Norepinephrine** is the primary neurotransmitter released by **postganglionic sympathetic neurons** directly onto the heart to increase heart rate and contractility in response to a drop in blood pressure. - It acts on **beta-1 adrenergic receptors** in the sinoatrial (SA) node, atria, and ventricles, leading to increased chronotropy (heart rate) and inotropy (contractility). *Dopamine* - While **dopamine** can have cardiovascular effects, particularly at high doses, it is not the primary neurotransmitter released by the sympathetic nervous system for direct heart rate regulation. - Dopamine is a precursor to norepinephrine and epinephrine, but its main physiological roles involve **renal blood flow regulation** and central nervous system functions. *Acetylcholine* - **Acetylcholine** is the primary neurotransmitter of the **parasympathetic nervous system**, which generally acts to **decrease heart rate** (bradycardia) through muscarinic receptors. - It is also released by **preganglionic sympathetic fibers**, but these do not directly innervate the heart to produce the desired effect of increasing heart rate. *Epinephrine* - **Epinephrine** (adrenaline) is primarily a **hormone** released from the **adrenal medulla** into the bloodstream, not directly from postganglionic sympathetic nerve terminals to the heart. - Although it has strong effects on beta-1 receptors in the heart, its release is more generalized and slower than the direct neuronal release of norepinephrine.