NEET-PG 2015 Practice Questions

Q: Among the following organs, which takes the longest to putrefy in females?

Uterus. ***Uterus*** - The **uterus** (particularly the **pregnant/gravid uterus**) is the organ that takes the **longest to putrefy in females**. - This is due to its **thick muscular walls** and **dense fibrous tissue composition**, making it highly resistant to bacterial degradation and putrefaction. - The uterus maintains its structural integrity post-mortem significantly longer than other organs, which is a classical teaching in forensic medicine. - In males, the analogous organ is the **prostate gland**. *Hair* - **Hair is composed primarily of keratin**, a protein highly resistant to decay and can persist for very long periods. - However, hair is **not an organ** but rather an appendage/derivative of skin, and the question specifically refers to organs. - While hair resists decomposition exceptionally well, it doesn't qualify as an answer to this question. *Bone* - Although bones are very durable and can persist for centuries, they undergo decomposition through the action of **microorganisms and environmental factors**. - **Bone decomposition** involves degradation of organic components (collagen, proteins), while the mineral matrix (hydroxyapatite) remains stable longer. - Bones are slower to decompose than most soft tissues but faster than the uterus in the context of putrefaction. *Cartilage* - Cartilage is a **relatively resistant connective tissue** due to its avascular nature and dense extracellular matrix. - However, it is still susceptible to **enzymatic breakdown and bacterial action** during decomposition. - Cartilage degrades faster than the dense muscular tissue of the uterus.

Q: In which condition is adipocere formation most likely to occur?

Dead body buried in damp, clay soil. **Dead body buried in damp, clay soil** - **Adipocere formation**, also known as "grave wax," is a post-mortem change where **body fats** hydrolyze into fatty acids and ammonia, forming a waxy, soap-like substance. - This process requires specific conditions: a **moist, anaerobic environment**, and temperatures above freezing, often found in **damp, clay soil** or submerged in water. *Dead body exposed to air* - Exposure to air promotes **putrefaction** (decomposition by bacteria and enzymes) and **mummification** (drying out of tissues), rather than adipocere formation. - An **aerobic environment** does not support the chemical reactions necessary for fat hydrolysis into adipocere. *Burial in dry hot air* - High temperatures and dry air promote **desiccation** and **mummification**, leading to the preservation of tissues by drying. - The lack of moisture in a dry environment inhibits the hydrolysis of fats required for adipocere formation. *None of the options* - This option is incorrect because the conditions described in "Dead body buried in damp, clay soil" are ideal for adipocere formation.

Q: Which cells in the retina are primarily affected by methanol toxicity?

Ganglion cells of the retina. ***Ganglion cells of the retina*** - Methanol toxicity, specifically its metabolite **formic acid**, selectively targets and damages **retinal ganglion cells**. - This damage leads to **optic neuropathy** and can cause permanent vision loss or blindness. *Photoreceptor cells* - These cells (rods and cones) are responsible for light detection but are generally **not primarily affected** by methanol toxicity. - While severe toxicity can lead to widespread retinal damage, initial and primary damage is to the ganglion cells. *Bipolar cells* - Bipolar cells transmit signals from photoreceptors to ganglion cells but are **not the primary target** of methanol's toxic effects. - Their damage would typically be secondary to severe, prolonged methanol poisoning. *Horizontal cells* - Horizontal cells are involved in lateral inhibition and signal processing within the retina but are **not selectively vulnerable** to methanol toxicity. - Damage to these cells is not a defining feature of methanol-induced vision loss.

Q: Which of the following is most specific for arsenic poisoning ?

Garlic-like odor in breath and urine. ***Garlic-like odor in breath and urine*** - A **garlic-like odor** in the breath and urine is a classic and highly **specific sign** of **arsenic poisoning**. - This distinctive odor is due to the **methylation of arsenic** compounds in the body. *Blue line on gums* - A **blue line on the gums**, also known as a **Burton line**, is characteristic of **lead poisoning**, not arsenic. - It results from the deposition of **lead sulfide** in the gingival tissue. *Tremors* - **Tremors** can be a symptom of various toxic exposures and neurological conditions, making them a **non-specific finding** for arsenic poisoning alone. - While **chronic arsenic poisoning** can lead to neurological symptoms, tremors are not a primary distinguishing feature. *Anemia* - **Anemia** is a common and **non-specific sign** that can be caused by many conditions, including various toxic exposures. - While chronic arsenic exposure can lead to **bone marrow suppression** and anemia, it is not specific enough for diagnosis.

Q: Which of the following conditions is characterized by the presence of blisters?

Burns. ***Burns*** - Blisters, or **vesicles/bullae**, are a hallmark of **partial-thickness (second-degree) burns**, where damage extends into the dermis. - They form as **serous fluid** accumulates between the epidermis and the damaged dermal layers. - These are **antemortem (vital) blisters** that develop in living tissue as a response to thermal injury. *Putrefaction* - This is the **decomposition of organic matter** by microorganisms, characterized by **odor, discoloration, and gas formation**. - While **putrefactive blisters** can form postmortem due to gas accumulation and skin separation, these are **postmortem artifacts**, not vital reactions. - The key distinction: putrefactive blisters lack the **inflammatory response** and **vital reaction** seen in antemortem burn blisters. - In the context of injuries and their clinical significance, burns are the primary condition characterized by blister formation. *Arsenic Poisoning* - While chronic arsenic exposure can cause **hyperpigmentation** and **hyperkeratosis**, acute poisoning primarily involves **gastrointestinal symptoms**, cardiovascular collapse, and neurological effects. - Blister formation is not a characteristic or common dermatological manifestation of arsenic poisoning. *Postmortem caloricity* - This refers to the **temporary rise in body temperature** after death, typically seen in cases of **sepsis** or certain drug intoxications. - It is a **thermal phenomenon** and does not involve the formation of blisters on the skin.

Q: Which of the following substances is commonly known as an arrow poison used by indigenous South American tribes?

Curare. ***Curare*** - **Curare** is the traditional name for South American arrow poisons derived from plants, primarily *Chondrodendron tomentosum* and *Strychnos* species - It acts as a **competitive non-depolarizing neuromuscular blocking agent**, blocking nicotinic receptors at the neuromuscular junction - Causes **skeletal muscle paralysis** by competing with acetylcholine, leading to respiratory failure in prey - **Clinical relevance:** Tubocurarine (d-tubocurarine), derived from curare, was historically used as a muscle relaxant in surgery; modern derivatives include atracurium, vecuronium, and rocuronium *Opium* - **Opium** is derived from *Papaver somniferum* (opium poppy) and contains alkaloids like morphine and codeine - Acts on **opioid receptors** in the CNS to produce analgesia and sedation - Not used as an arrow poison by South American tribes; its effects are analgesic rather than paralytic *Cannabis* - **Cannabis** (*Cannabis sativa*) contains psychoactive compounds like THC (tetrahydrocannabinol) - Acts on **cannabinoid receptors** producing psychoactive and analgesic effects - Not used as an arrow poison; lacks the rapid paralytic action needed for hunting *Cyanide* - **Cyanide** inhibits cytochrome c oxidase, blocking cellular respiration and causing rapid cell death - While highly toxic, it is **not the traditional arrow poison** of South American indigenous tribes - Traditional arrow poisons like curare cause neuromuscular paralysis rather than cellular asphyxiation

Q: What is the respiratory quotient?

CO2 released to O2 consumed. **CO2 released to O2 consumed** - The **respiratory quotient (RQ)** is a ratio used in metabolism to describe the proportion of **carbon dioxide (CO2) produced** by the body relative to the **oxygen (O2) consumed**. - It is calculated as the **volume of CO2 released** divided by the **volume of O2 consumed** over a specific period. - RQ = VCO2/VO2, where VCO2 is CO2 production and VO2 is O2 consumption. *CO2 consumed to O2 released* - This option is incorrect as it reverses the correct order and refers to **CO2 consumption and O2 release**, which are not the standard components of the RQ calculation. - The body primarily **releases CO2** and **consumes O2** during cellular respiration. *O2 released to CO2 consumed* - This option is also incorrect because it inverts both the gases and the direction of their metabolic flow (release vs. consumption). - Metabolic processes involve **O2 consumption** and **CO2 release**, not the other way around. *O2 consumed to CO2 released* - This option incorrectly reverses the numerator and denominator in the RQ formula. - The standard definition places **CO2 production** in the numerator and **O2 consumption** in the denominator.

Q: What is the average size of platelets in micrometers?

2-3 µm. ***2-3 µm*** - Platelets, also known as **thrombocytes**, are small, anucleated cell fragments crucial for **hemostasis**, and their average diameter generally falls within the range of 2-3 micrometers. - This **small size** allows them to easily navigate through capillaries and aggregate rapidly at sites of vascular injury. *3-4 µm* - While platelets can vary slightly in size, an average of 3-4 µm is generally considered a bit on the larger side and not the typical average diameter. - Larger platelets might be seen in certain conditions like **idiopathic thrombocytopenic purpura (ITP)**, but this is not the average normal size. *4-5 µm* - This range is significantly larger than the typical size of normal circulating platelets. - Platelets this large would be considered **macroplatelets** and could indicate specific pathological conditions or inherited platelet disorders. *1-2 µm* - This size range is generally considered smaller than the average normal platelet size. - Very small platelets might be seen in some specific conditions, but it's not the usual average for healthy individuals.

Q: Which term describes the sexual gratification obtained from enemas?

Klismaphilia. ***Klismaphilia*** - This term specifically refers to a **paraphilia** where an individual experiences **sexual arousal or gratification from enemas**. - It involves the use of enemas for purposes beyond their medical indication, for sexual pleasure. *Exhibitionism* - This paraphilia involves experiencing **sexual arousal from exposing one's genitals to an unsuspecting stranger**. - The gratification comes from the shock or surprise of the observer, not from enemas. *Fetishism* - This involves **sexual attraction to inanimate objects or non-genital body parts**. - While it could theoretically involve objects used for enemas, "klismaphilia" specifically describes the act with enemas. *Frotteurism* - This paraphilia is characterized by **sexual gratification from rubbing against or touching a nonconsenting person** in crowded public places. - It does not involve enemas and is instead focused on physical contact without consent.

Question 1

What is defined as a negative autopsy?

Accepted Answer

No cause of death is found after both gross and histopathological examination.

Answer

Cause is apparent on gross examination but not on histopathological examination.

Answer

Gross findings are minimal.

Answer

Cause is apparent on gross examination but not found due to constraints on the part of the doctor.

Question 2

Among the following organs, which takes the longest to putrefy in females?

Accepted Answer

Uterus

Answer

Hair

Answer

Bone

Answer

Cartilage

Question 3

In which condition is adipocere formation most likely to occur?

Accepted Answer

Dead body buried in damp, clay soil

Answer

Dead body exposed to air

Answer

Burial in dry hot air

Answer

None of the options

Question 4

Which cells in the retina are primarily affected by methanol toxicity?

Accepted Answer

Ganglion cells of the retina

Answer

Photoreceptor cells

Answer

Bipolar cells

Answer

Horizontal cells

Question 5

Which of the following is most specific for arsenic poisoning ?

Accepted Answer

Garlic-like odor in breath and urine

Answer

Blue line on gums

Answer

Tremors

Answer

Anemia

Question 6

Which of the following conditions is characterized by the presence of blisters?

Accepted Answer

Burns

Answer

Arsenic Poisoning

Answer

Postmortem caloricity

Answer

Putrefaction

Question 7

Which of the following substances is commonly known as an arrow poison used by indigenous South American tribes?

Accepted Answer

Curare

Answer

Opium

Answer

Cannabis

Answer

Cyanide

Question 8

What is the respiratory quotient?

Accepted Answer

CO2 released to O2 consumed

Answer

CO2 consumed to O2 released

Answer

O2 released to CO2 consumed

Answer

O2 consumed to CO2 released

Question 9

What is the average size of platelets in micrometers?

Accepted Answer

2-3 µm

Answer

4-5 µm

Answer

3-4 µm

Answer

1-2 µm

Question 10

Which term describes the sexual gratification obtained from enemas?

Accepted Answer

Klismaphilia

Answer

Exhibitionism

Answer

Frotteurism

Answer

Fetishism

NEET-PG 2015

Forensic Medicine

Pharmacology

Physiology

Psychiatry