UPSC-CMS 2012 Practice Questions

Q: Consider the following statements: 1. Diets high in vitamin C have been claimed to lower the incidence of certain cancers, particularly oesophageal and gastric cancers. 2. Vitamin C can prevent the conversion of nitrites and secondary amines to carcinogenic nitrosamines. Which of the statements given above is/are correct?

Both 1 and 2. ***Both 1 and 2*** - **Statement 1 is correct:** Epidemiological studies have consistently shown that diets high in vitamin C are associated with a **lower incidence of oesophageal and gastric cancers**, attributed to its antioxidant properties and protective mechanisms. - **Statement 2 is correct:** Vitamin C acts as a **reducing agent that blocks nitrosamine formation** by preventing nitrites and secondary amines from reacting to form these carcinogenic compounds in the acidic gastric environment. - Both statements are **independently true and complementary** - statement 2 explains one of the key mechanisms by which statement 1's observation occurs. *1 only* - This option is incorrect because it ignores statement 2, which describes a **well-established biochemical mechanism** of vitamin C's cancer-protective effect. - The ability of vitamin C to prevent nitrosamine formation is a **proven protective mechanism**, not just a claim. *2 only* - This option is incorrect because it ignores statement 1, which accurately reflects **epidemiological evidence** linking high vitamin C intake with reduced cancer risk. - The association between dietary vitamin C and lower cancer incidence is **well-documented in observational studies**. *Neither 1 nor 2* - This option is completely incorrect as **both statements are scientifically accurate** and supported by substantial evidence. - Vitamin C's role in **cancer prevention through antioxidant activity and nitrosamine inhibition** is well-established in biochemistry and nutrition science.

Q: The biological value of a given protein depends upon

Digestibility and amino acid composition. ***Digestibility and amino acid composition*** - The **biological value (BV)** of a protein measures how efficiently the body can use the absorbed protein from a food source for growth and maintenance. - It is primarily determined by two factors: the **digestibility** of the protein (how much is absorbed) and its **amino acid composition** (the proportion and availability of essential amino acids). *Digestibility and leucine content* - While **digestibility** is an important factor for biological value, **leucine content** alone is not sufficient to determine it. - The biological value depends on the **overall balance of essential amino acids**, not just one specific amino acid. *Amino acid composition and specific dynamic effect* - **Amino acid composition** is crucial for biological value, but the **specific dynamic effect (SDE)**, also known as the thermic effect of food, refers to the energy expended during the digestion, absorption, and assimilation of food. - SDE is related to energy metabolism, not directly to the protein's utility for tissue synthesis. *Amino acid composition alone* - **Amino acid composition** is a key determinant, particularly the presence and proportion of **essential amino acids**. - However, for a protein to be utilized, it must first be **digested and absorbed**, making digestibility an equally critical factor affecting its overall biological value.

Q: The most common opportunistic infection observed in patients with AIDS is

Pneumocystis carinii. ***Pneumocystis carinii*** - **Pneumocystis pneumonia (PCP)**, caused by *Pneumocystis jirovecii* (formerly *P. carinii*), is the **most common opportunistic infection** and a leading cause of death in AIDS patients [1]. - It typically presents with **fever, cough, and dyspnea** in patients with a CD4 count below 200 cells/µL [1]. *Pseudomonas aeruginosa* - While *Pseudomonas aeruginosa* can cause serious infections in immunocompromised individuals, it is not the **most common opportunistic infection** seen in patients with AIDS. - Infections usually involve the **lungs (pneumonia)**, skin, urinary tract, or bacteremia, often in patients with **neutropenia** or hospitalized for other reasons. *Atypical mycobacteria* - **Mycobacterium avium complex (MAC)** is an important opportunistic pathogen in AIDS patients (CD4 < 50 cells/µL), causing disseminated disease, but it is not the **most common** overall [2]. - Symptoms include **fever, weight loss, night sweats, and diarrhea**, and diagnosis requires blood cultures or tissue biopsy [2]. *Haemophilus influenzae* - *Haemophilus influenzae* can cause **respiratory tract infections** (e.g., sinusitis, bronchitis, pneumonia) and invasive disease, particularly in children and individuals with underlying lung disease. - While patients with HIV may be more susceptible to bacterial infections, *H. influenzae* is **not classified as a classic opportunistic infection** in the same way as *Pneumocystis* or MAC in AIDS patients.

Q: A parous woman complains of itching in the vulva. On examination, there is local redness and swelling and white flakes around the introitus. The most probable diagnosis is

Candidiasis. ***Candidiasis*** - The symptoms of **itching**, **redness**, **swelling** of the vulva, and **white flakes** (often described as "cottage cheese-like") around the introitus are highly characteristic of vulvovaginal **candidiasis (yeast infection)**. - This condition is common, especially in parous women, and is caused by an overgrowth of *Candida* species. *Trichomoniasis* - Typically presents with a **foamy, greenish-yellow discharge**, a **foul odor**, and often **punctate hemorrhages** on the cervix (strawberry cervix). - While it can cause itching and irritation, the presence of **white flakes** is not a characteristic feature. *Gonorrhoea* - Often **asymptomatic** in women or presents with **purulent vaginal discharge**, **dysuria**, and **pelvic pain**. - It does not typically cause **white flakes** around the introitus and the discharge is usually not itchy initially. *Pyogenic vulvovaginitis* - This is a general term for bacterial vulvovaginitis that would present with signs of **bacterial infection**, such as a **malodorous discharge** and significant inflammation. - While it can cause redness and swelling, the description of **white flakes** is not specific to pyogenic infections and points more towards a fungal etiology.

Q: The characteristic features of inguinal lymph nodes associated with a primary syphilitic lesion of the vulva are

Firm, shotty, painless nodes that do not suppurate. **Firm, shotty, painless nodes that do not suppurate** - Lymphadenopathy in **primary syphilis** typically presents as **firm, bilateral, painless**, and non-suppurative lymph nodes, often described as "shotty." - These nodes are usually discrete and do not tend to mat together or form abscesses, reflecting the inflammatory response to **_Treponema pallidum_**. *Painful, tender nodes which become matted together to form an abscess* - **Painful, matted, and suppurative** lymph nodes are more characteristic of other infections, such as those caused by bacterial pathogens like **_Staphylococcus aureus_** or **_Streptococcus pyogenes_**, or conditions like **lymphogranuloma venereum**. - These features are generally not associated with the indolent inflammatory response seen in primary syphilis. *Non-suppurative tender enlarged nodes* - While the nodes in primary syphilis are **non-suppurative and enlarged**, they are typically **painless**, not tender. - **Tenderness** can suggest a more acute or active inflammatory process, and the absence of pain is a key distinguishing feature of syphilitic lymphadenopathy. *Painful inflamed nodes which undergo necrosis and develop a chronic sinus* - **Necrotic lymph nodes** with **chronic sinus formation** are indicative of severe and chronic infections such as **tuberculosis (scrofula)** or deep fungal infections, or conditions like **cat-scratch disease** in some cases. - These aggressive features are not consistent with the typical presentation of primary syphilis.

Q: The common manifestations of genital tuberculosis include the following except

Foul-smelling vaginal discharge. ***Foul-smelling vaginal discharge*** - While infections can cause vaginal discharge, a **foul-smelling discharge** is typically associated with bacterial vaginosis or trichomoniasis, not primarily with genital tuberculosis due to its granulomatous nature. - Genital tuberculosis often presents with **non-specific symptoms** or no symptoms at all, rather than purulent or foul-smelling discharge. *Pelvic pain* - **Chronic pelvic pain** is a very common symptom of genital tuberculosis, often due to inflammation and involvement of pelvic organs. - The pain can be constant or intermittent and may be difficult to localize. *Amenorrhoea* - **Amenorrhea**, particularly secondary amenorrhoea, can occur due to endometrial damage or destruction caused by the tuberculous infection. - This can lead to **intrauterine adhesions (Asherman's syndrome)** or functional impairment of the endometrium, hindering menstruation. *Infertility* - **Infertility** is one of the most frequent and significant manifestations of genital tuberculosis, especially in women. - It often results from **tubal occlusion** or distortion, endometrial damage, or ovarian dysfunction caused by the disease, leading to an inability to conceive or carry a pregnancy to term.

Q: A 60-year-old woman is diagnosed with genital malignancy. On physical examination she is found to have the enlargement of superficial inguinal lymph nodes. The most likely organ involved is

Vulva. ***Vulva (Correct Answer)*** - The **vulva** drains primarily to the **superficial inguinal lymph nodes**, making its malignancy the most likely cause of their enlargement. - Unlike deeper pelvic organs, vulvar cancer metastases travel directly to these easily palpable nodes. - This is a key anatomical principle: **external genitalia → superficial inguinal nodes**. *Adnexa (Incorrect)* - Malignancies of the **adnexa** (ovaries, fallopian tubes) typically metastasize via the **para-aortic or pelvic lymph nodes**, not the superficial inguinal nodes. - These follow the ovarian vessels along the infundibulopelvic ligament. - Distant inguinal node involvement would indicate advanced disease, but initial spread is not to these nodes. *Cervix (Incorrect)* - Cervical cancer primarily metastasizes to the **pelvic lymph nodes** (e.g., obturator, internal iliac, external iliac), with superficial inguinal nodes rarely involved unless there is extensive local spread. - The lymphatic drainage of the cervix is distinct from that of the external genitalia. *Uterus (Incorrect)* - Uterine cancer (endometrial or uterine body) typically spreads to the **pelvic** and **para-aortic lymph nodes**, following the ovarian and uterine vessels. - Like cervical cancer, superficial inguinal lymph node involvement is uncommon and usually a sign of very advanced or unusual spread.

Q: A recently married woman presents with dysuria and increased urinary frequency of two-days duration. On physical examination, her body temperature is 38°C and her vital signs are normal. Her gynaecologic examination does not reveal any vaginal discharge, vaginitis or cervicitis. Her urine analysis reveals 14 WBC per high power field and many gram negative rods. Which of the following is the most appropriate pharmacotherapy ?

Nitrofurantoin. ***Nitrofurantoin*** - **Nitrofurantoin** is a first-line agent for **uncomplicated cystitis** due to its good efficacy, low resistance rates, and minimal systemic side effects. - Its concentration in the urine is high, making it effective against common urinary pathogens like **Gram-negative rods**. - **Note:** The patient has a temperature of 38°C, which is borderline. Current guidelines suggest that **fever may indicate upper tract involvement** (pyelonephritis), where nitrofurantoin would be less appropriate due to poor tissue penetration. However, with **normal vital signs** and localized symptoms, this may represent uncomplicated cystitis with mild pyrexia. *Ciprofloxacin* - **Fluoroquinolones** like ciprofloxacin are highly effective and achieve excellent tissue penetration, making them ideal for **complicated UTIs or pyelonephritis**. - The presence of **fever (38°C)** could justify fluoroquinolone use, as it may indicate upper tract involvement. - However, fluoroquinolones are increasingly reserved for complicated cases due to concerns about promoting **antibiotic resistance** and potential side effects (e.g., tendon rupture, C. difficile). - **Current IDSA guidelines** recommend fluoroquinolones when pyelonephritis is suspected. *Trimethoprim-sulfamethoxazole* - While effective for UTIs, **trimethoprim-sulfamethoxazole** resistance rates have increased significantly, particularly among *E. coli* strains. - It can be used for uncomplicated cystitis when local resistance rates are <20%, but is less preferred than nitrofurantoin in many settings. *Amoxicillin* - **Amoxicillin** is not recommended as first-line treatment for acute cystitis due to high rates of **bacterial resistance**, particularly from common uropathogens like *E. coli*. - Its efficacy against **Gram-negative rods** is limited, especially with prevalent beta-lactamase production.

Q: The drugs which may interfere with the efficacy of oral contraceptives and increase the failure rates are all of the following EXCEPT

Ampicillin. ***Ampicillin (Correct Answer)*** - While previously thought to reduce oral contraceptive efficacy, **current evidence shows ampicillin has NO significant interaction** with oral contraceptives. - The old theory suggested some antibiotics might alter gut flora and reduce **enterohepatic recirculation of estrogen**, but this has been largely **debunked for ampicillin and most antibiotics**. - **Unlike the enzyme inducers listed below**, ampicillin does not significantly affect OC metabolism or efficacy. *Phenytoin (Incorrect - DOES interfere)* - **Phenytoin is a potent enzyme inducer** (cytochrome P450 enzymes). - This induction enhances the metabolism of estrogen and progestin components, **reducing their plasma concentrations and effectiveness**. - Backup contraception is recommended when using phenytoin with oral contraceptives. *Barbiturates (Incorrect - DOES interfere)* - **Barbiturates are potent enzyme inducers**, similar to phenytoin. - They increase hepatic metabolism of oral contraceptive steroids, leading to **lower circulating hormone levels and increased risk of contraceptive failure**. - Alternative contraception should be considered. *Rifampicin (Incorrect - DOES interfere)* - **Rifampicin is one of the strongest inducers of hepatic microsomal enzymes**, particularly CYP3A4. - This leads to **rapid and substantial increase in metabolism of both estrogen and progestin**, drastically reducing OC efficacy. - **Non-hormonal contraception is strongly recommended** during rifampicin therapy.

Q: Iron is absorbed predominantly in the

Duodenum. ***Duodenum*** - The **duodenum** is the primary site for iron absorption, with maximum absorption occurring in the **duodenum and proximal jejunum**. - Iron is absorbed in both **heme** and **non-heme** forms through specific transporters like **DMT1** (divalent metal transporter 1) and **ferroportin**. - The acidic pH from gastric secretions helps maintain iron in the soluble **ferrous (Fe²⁺) form**, which is readily absorbed in the duodenum. - The duodenal enterocytes have the highest concentration of iron transport proteins, making this the most efficient site for iron absorption. *Jejunum* - Some iron absorption can occur in the **proximal jejunum**, but it decreases progressively in the distal parts. - The jejunum primarily absorbs **carbohydrates**, **proteins**, **amino acids**, and **fats**. - While it contributes to iron absorption, it is not the predominant site. *Ileum* - The ileum is specialized for absorption of **vitamin B12** (via intrinsic factor), **bile salts**, and fat-soluble vitamins. - Iron absorption in the ileum is minimal compared to the duodenum. - By the time chyme reaches the ileum, most iron has already been absorbed in the proximal small intestine. *Stomach* - The stomach does not absorb iron but plays an important preparatory role. - Gastric **hydrochloric acid** (HCl) helps solubilize iron and convert ferric iron (Fe³⁺) to ferrous iron (Fe²⁺), which is the absorbable form. - **Intrinsic factor** is secreted here for vitamin B12 absorption, not iron.

Question 1

Consider the following statements:

1. Diets high in vitamin C have been claimed to lower the incidence of certain cancers, particularly oesophageal and gastric cancers.

2. Vitamin C can prevent the conversion of nitrites and secondary amines to carcinogenic nitrosamines.

Which of the statements given above is/are correct?

Accepted Answer

Both 1 and 2

Answer

1 only

Answer

2 only

Answer

Neither 1 nor 2

Question 2

The biological value of a given protein depends upon

Accepted Answer

Digestibility and amino acid composition

Answer

Digestibility and leucine content

Answer

Amino acid composition and specific dynamic effect

Answer

Amino acid composition alone

Question 3

The most common opportunistic infection observed in patients with AIDS is

Accepted Answer

Pneumocystis carinii

Answer

Pseudomonas aeruginosa

Answer

Atypical mycobacteria

Answer

Haemophilus influenzae

Question 4

A parous woman complains of itching in the vulva. On examination, there is local redness and swelling and white flakes around the introitus. The most probable diagnosis is

Accepted Answer

Candidiasis

Answer

Trichomoniasis

Answer

Gonorrhoea

Answer

Pyogenic vulvovaginitis

Question 5

The characteristic features of inguinal lymph nodes associated with a primary syphilitic lesion of the vulva are

Accepted Answer

Firm, shotty, painless nodes that do not suppurate

Answer

Painful, tender nodes which become matted together to form an abscess

Answer

Non-suppurative tender enlarged nodes

Answer

Painful inflamed nodes which undergo necrosis and develop a chronic sinus

Question 6

The common manifestations of genital tuberculosis include the following except

Accepted Answer

Foul-smelling vaginal discharge

Answer

Pelvic pain

Answer

Amenorrhoea

Answer

Infertility

Question 7

A 60-year-old woman is diagnosed with genital malignancy. On physical examination she is found to have the enlargement of superficial inguinal lymph nodes. The most likely organ involved is

Accepted Answer

Vulva

Answer

Adnexa

Answer

Cervix

Answer

Uterus

Question 8

A recently married woman presents with dysuria and increased urinary frequency of two-days duration. On physical examination, her body temperature is 38°C and her vital signs are normal. Her gynaecologic examination does not reveal any vaginal discharge, vaginitis or cervicitis. Her urine analysis reveals 14 WBC per high power field and many gram negative rods. Which of the following is the most appropriate pharmacotherapy ?

Accepted Answer

Nitrofurantoin

Answer

Trimethoprim-sulfamethoxazole

Answer

Amoxicillin

Answer

Ciprofloxacin

Question 9

The drugs which may interfere with the efficacy of oral contraceptives and increase the failure rates are all of the following EXCEPT

Accepted Answer

Ampicillin

Answer

Phenytoin

Answer

Barbiturates

Answer

Rifampicin

Question 10

Iron is absorbed predominantly in the

Accepted Answer

Duodenum

Answer

Jejunum

Answer

Ileum

Answer

Stomach

UPSC-CMS 2012

Biochemistry

Internal Medicine

Obstetrics and Gynecology

Pharmacology

Physiology