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Science & Technology

923 questions asked in UPSC Prelims.

2001 · Q124Science & TechnologyBiotechnology & Geneticsmoderate

Assertion (A): Scientists can cut apart and paste together DNA molecules at will, regardless of the source of the molecules. Reason (R): DNA fragments can be manipulated using restriction endonucleases and DNA ligases. Which of the following is correct?

  1. (a)Both A and R are individually true and R is the correct explanation of A
  2. (b)Both A and R are individually true but R is NOT a correct explanation of A
  3. (c)A is true but R is false
  4. (d)A is false but R is true
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Official answer(a) Both A and R are individually true and R is the correct explanation of A

2001 · Q133Science & TechnologyScience & Technology Historydifficult

Match List I with List II and select the correct answer using the codes given below the Lists: List I (Achievement in genetics) I. Discovery of transduction and conjugation in bacteria II. Establishing the sex-linked inheritance III. Isolation of DNA polymerase from E. coli IV. Establishing the complete genetic code List II (Scientists) A) Khurana B) Kornberg C) Lederberg D) Morgan E) Ochoa

  1. (a)I-D, II-C, III-B, IV-A
  2. (b)I-C, II-D, III-A, IV-E
  3. (c)I-D, II-C, III-A, IV-E
  4. (d)I-C, II-D, III-B, IV-A
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Official answer(d) I-C, II-D, III-B, IV-A

2001 · Q137Science & TechnologyHealth & Diseaseseasy

“Metastasis” is the process by which

  1. (a)cells divide rapidly under the influence of drugs
  2. (b)cancer cells spread through the blood or lymphatic system to other sites or organs
  3. (c)the chromosomes in cell nuclei are attached to the spindle before moving to the anaphase poles
  4. (d)cancer cells are successfully inhibited to divide any further
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Official answer(b) cancer cells spread through the blood or lymphatic system to other sites or organs

2001 · Q138Science & TechnologyBiologymoderate

Match List I with List II and select the correct answer using the codes given below the Lists: List I (Substance) I. Ptyalin II. Pepsin III. Renin IV. Oxytocin List II (Physiological role) A) Converts angiotensinogen in blood into angiotensin B) Digests starch C) Digests proteins D) Hydrolyses fats E) Induces contraction of smooth muscles

  1. (a)I-B, II-C, III-A, IV-E
  2. (b)I-C, II-D, III-B, IV-E
  3. (c)I-B, II-C, III-E, IV-A
  4. (d)I-C, II-A, III-B, IV-D
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Official answer(a) I-B, II-C, III-A, IV-E