Competitive Exams: Medical Science MCQs (Practice-Test 111 of 135)

  1. The rigidity seen in Parkinsons disease is due to

    1. excessive stimulation of alpha motor neurons of all the muscles

    2. hypofunction of motor cortex

    3. absence of carebellar Inhibition

    4. increased sensitivity of stretch reflex

  2. Match List I with List II and select the correct answer.

    List-I (Hormone) List-II (Secreted from)
    1. Oestrogen

    2. Progesterone

    3. Testosterone

    4. FSH

    1. Corpus luteum

    2. Graafian follicle

    3. Anterior pituitary

    4. Leydig cells

    • A
    • B
    • C
    • D
      • 2
      • 1
      • 4
      • 3
      • 3
      • 4
      • 1
      • 2
      • 3
      • 1
      • 4
      • 2
      • 2
      • 4
      • 1
      • 3
  3. Synthesis of testosterone is controlled by

    1. LH

    2. LHRH

    3. FSH

    4. TSH

  4. The first heart sound

    1. is due to the closure of semilunar valves

    2. is due to the closure of atrioventricular valves

    3. marks the end of systole

    4. Corresponds to QRS complex of the

    ECG

  5. Consider the following statements: The mean electrical axis of the heart

    1. is a bout 60

    2. is directed from the base to apex.

    3. deviates in ventricular hypertrophy

    Of these statements

    1. 1 and 3 are correct

    2. 2 and 3 are correct

    3. 1 and 2 are correct

    4. 1, 2 and 3 are correct

  6. Consider the following statements: Cardiac output is increased by sympathetic stimulation due to

    1. increase in the force of contraction.

    2. increase in the heart rate.

    3. Starlings effect

    4. Bainbridge reflex

    Of these statements

    1. 1 and 4 are correct

    2. 1 and 2 are correct

    3. l, 2 and 3 are correct

    4. 2, 3 and 4 are correct

  7. The renal threshold value for complete tubular reabsorption of glucose is

    1. 70 − 80 mg% blood glucose

    2. 120 − l40 mg% blood glucose

    3. 170 − 180 mg% blood glucose

    4. 220 − 240 mg% blood glucose

  8. The main intracellular buffer is

    1. Bicarbonate

    2. Phosphate

    3. Haemoglobin

    4. Citrate

  9. Fat digestion

    1. requires the formation of acid chyme

    2. requires an alkaline pH

    3. is not affected in hepatic damage

    4. requires the release of gastrin

  10. The rate limiting step in the absorption of lipid is the

    1. presence of digestive enzyme lipase

    2. presence of bile salts for emulsification and micellar formation

    3. migration of micelle from intestinal chyme to microvilli surface

    4. release of lipids, cholesterol and fat soluble vitamins from micelle oncoming into contact with microvilli

  11. Muscle glycogen cannot contribute to blood sugger because muscle tissue lacks

    1. phosphorylase

    2. debranching enzyme

    3. glucose 6-phosphatase

    4. glucokinase

  12. Consider the following statements: Chargaffs observation on nitrogen base contents of DNA of all species is that there are equal numbers of

    1. adenine and guanine

    2. adenine and thymine

    3. guanine and cytosine

    4. guanine and thymine

    Of these statements

    1. 1 and 2 are correct

    2. 2 and 3 are correct

    3. 3 and 4 are correct

    4. 1 and 4 are correct

  13. Post-translational hydroxylation of uracil forms thymine in

    1. messenger RNA

    2. transfer RNA

    3. ribosomal RNA

    4. heteronuclear RNA

  14. Which one of the following is not a termination codon?

    1. UCU

    2. UAA

    3. UGA

    4. UAG

  15. Actinomycin D inhibits

    1. replication

    2. translation

    3. transcription

    4. post-translation