Medical Science 2024 Paper I 50 marks Describe

Q3

Describe the uterus under the following headings: (i) Gross anatomy (ii) Ligaments and supports (iii) Relations of uterus (iv) Blood supply (v) Lymphatic drainage (vi) Applied aspects Which antibiotics and toxins inhibit protein synthesis in prokaryotes and eukaryotes? Briefly explain the mechanism of action of each of them. What are ribozymes? Explain briefly the role of any one ribozyme in protein synthesis. Enumerate the major hormonal causes of dwarfism. Give their characteristic features. Describe the principal events during oogenesis in brief.

हिंदी में प्रश्न पढ़ें

गर्भाशय का वर्णन निम्नलिखित शीर्षकों के अंतर्गत कीजिए : (i) सकल शारीर (ii) स्नायु एवं अवलम्ब (iii) गर्भाशय के संबंध (iv) रक्त आपूर्ति (v) लसीका जल-निकासी (vi) अनुप्रयुक्त पहलू कौन-से एंटीबायोटिक तथा कौन-से टॉक्सिन प्राकृतिककों और युक्रियकों में प्रोटीन संश्लेषण का संदमन करते हैं? प्रत्येक के कार्य करने की क्रियाविधि संक्षेप में समझाइए। राइबोजाइम क्या होते हैं? प्रोटीन संश्लेषण में किसी एक राइबोजाइम की भूमिका संक्षेप में समझाइए। बामना के प्रमुख हार्मोनल कारण गिनाइए। उनकी लाक्षणिक विशिष्टताएं बताइए। डिंबजनन में होने वाली प्रमुख घटनाओं का संक्षेप में वर्णन कीजिए।

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Directive word: Describe

This question asks you to describe. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

The directive 'describe' demands comprehensive, structured coverage of anatomical facts and physiological mechanisms across all six sub-parts. Allocate approximately 35% of time/words to the uterus anatomy (parts i-vi combined) as it requires detailed diagrams; 25% to protein synthesis inhibitors with clear prokaryote-eukaryote distinction; 15% each to ribozymes and dwarfism; and 10% to oogenesis. Structure as: uterus anatomy with labeled diagrams → tabulated comparison of antibiotics/toxins → ribozyme mechanism with peptidyl transferase example → hormonal dwarfism classification → oogenesis stages with timing.

Key points expected

  • Uterus: pear-shaped, 7.5×5×2.5 cm, 50-70g; parts—fundus, body, isthmus, cervix; three layers—perimetrium, myometrium (thickest), endometrium (basal and functional layers)
  • Ligaments: Broad (mesometrium, mesosalpinx, mesovarium), round, uterosacral, cardinal/transverse cervical ligaments of Mackenrodt; pelvic floor support by levator ani and urogenital diaphragm
  • Relations: Anterior—urinary bladder and peritoneal vesicouterine pouch; posterior—rectum and rectouterine pouch of Douglas; lateral—broad ligament, uterine artery, ureter
  • Blood supply: Uterine artery (branch of anterior division of internal iliac), ovarian artery (abdominal aorta); arcuate arteries in myometrium, radial → spiral arteries in endometrium; venous drainage to uterine and ovarian plexuses → internal iliac veins
  • Lymphatic drainage: Fundus and upper body → para-aortic nodes (along ovarian vessels); lower body and cervix → external and internal iliac nodes; cervix also to obturator and sacral nodes
  • Applied aspects: Retroverted uterus, prolapse (cystocele, rectocele), hysterectomy (ureter at risk), endometrial carcinoma staging, fibroids (leiomyoma); protein synthesis inhibitors: tetracyclines, chloramphenicol, macrolides, aminoglycosides, linezolid (prokaryotes); diphtheria toxin, ricin, α-amanitin (eukaryotes); ribozymes—RNA with catalytic activity, peptidyl transferase (23S rRNA), RNase P, self-splicing introns; dwarfism—GH deficiency (pituitary), hypothyroidism (cretinism), glucocorticoid excess, Turner syndrome; oogenesis—mitotic proliferation, meiosis I arrest (dictyate), meiosis II arrest at metaphase until fertilization, polar body formation
  • Mechanism specifics: Tetracyclines (30S A-site), chloramphenicol (50S peptidyl transferase), macrolides (50S translocation block), aminoglycosides (30S misreading), diphtheria toxin (ADP-ribosylation of EF-2), ricin (60S subunit depurination), α-amanitin (RNA pol II inhibition)

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Precise anatomical measurements, accurate ligament attachments (broad ligament subdivisions), correct arterial origins and anastomoses, exact lymphatic pathways; flawless classification of protein synthesis inhibitors by ribosomal target and accurate mechanism details; correct hormonal axes for dwarfism with specific deficient hormones; accurate oogenesis timeline with correct arrest pointsMinor errors in measurements or ligament descriptions; incomplete inhibitor classification or confused prokaryote/eukaryote distinction; vague hormonal causes without specific deficiency identification; oogenesis stages present but timing or arrest points incorrectMajor anatomical errors (e.g., uterine artery from external iliac), confused ligament anatomy; fundamental errors in mechanism (e.g., tetracycline on 50S); incorrect hormonal classification; missing or completely wrong oogenesis stages
Clinical correlation20%10Rich applied content: ureteric injury in hysterectomy (water under the bridge), endometrial carcinoma FIGO staging relevance, specific antibiotic clinical uses (doxycycline for rickettsia, linezolid for MRSA), diphtheria toxoid vaccination, cretinism endemicity in Himalayan belt, GH deficiency diagnosis (IGF-1, stimulation tests), aneuploidy screening via oogenesis errorsGeneric mentions of applied aspects without specific clinical scenarios; antibiotic uses listed without disease context; dwarfism features described without diagnostic approach; limited reproductive clinical relevanceAbsent or token clinical correlation; no mention of surgical vulnerability of ureter, antibiotic resistance, or diagnostic criteria for hormonal deficiencies
Diagram / pathway20%10Clear labeled diagram of uterus in coronal section showing layers, cavity, cervical canal; sagittal view showing relations and pouches; schematic of ribosomal A/P/E sites with inhibitor binding locations; flowchart of oogenesis with ploidy changes and timing; tabular comparison of inhibitorsRough sketch without proper labeling or missing key structures; text description of mechanisms without visual representation; list format instead of pathway diagram for oogenesisNo diagrams despite explicit anatomical content; or diagrams with major errors in orientation or structure identification
Differential / staging20%10Systematic differential for dwarfism: pituitary vs. hypothyroid vs. Cushing's vs. Turner (karyotype, webbing, cardiac); endometrial carcinoma staging implications of lymphatic spread; inhibitor selectivity basis for therapeutic index; distinction between true vs. pseudohermaphroditism if relevantList of dwarfism causes without distinguishing features; mention of staging without anatomical basis; no comparison of prokaryote vs. eukaryote selectivityNo differential approach; confused or absent classification; failure to distinguish related conditions
Management / public-health angle15%7.5National health program relevance: RBSK for congenital hypothyroidism, iodized salt program, GH replacement therapy access; antibiotic stewardship for resistance prevention; maternal health programs (JSY, PMSMA) for uterine health; screening for cervical cancer; contraceptive implications of uterine anatomyGeneric treatment mentions without program linkage; standard antibiotic courses without resistance concern; hormone replacement without access issuesNo public health or preventive medicine perspective; purely descriptive without management implications

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