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

  1. The symptoms of Parkinsons disease are caused by the lesion of connections of basal ganglia at the site between

    1. Cerebral cortex and caudate nucleus

    2. Putamen and substantia nigra

    3. Thalamus and cerebral cortex

    4. Caudate nucleus and globus pallidus

  2. Fructose, the major energy source for spermatozoa in seminal fluid, is formed by

    1. dephosphorylation of fructose-1-phosphate

    2. reduction of D-glucose to sorbitol and oxidation of sorbitol to D-fructose

    3. isomerization of glucose-6-phosphate to fructose-6-phosphate and dephosphorylation of fructose-6-phosphate

    4. dephosphorylation of fructose-6-phosphate.

  3. Which of the following are associated with papillary muscles of the heart?

    1. Helping the a-v valves to close

    2. Preventing excessive bulging of a-v valves into atria.

    3. U wave of the ECG.

    4. Helping the a-v valves to open.

    Select the correct answer using the codes given below:

    1. 2 and 4

    2. 3 and 4

    3. 1 and 3

    4. 1 and 2

  4. Consider the following statements: Flare in Triple response can appear

    1. with intact nerves.

    2. after the division but before the degernation of nerves.

    3. after the division and degernation of nerves.

    Which of the statements is/are correct?

    1. 1 and 2

    2. 3 alone

    3. 2 alone

    4. 1 and 3

  5. Consider the following statements: Voluntary control of respiration is

    1. under the control of cerebral cortex.

    2. mediated by hypothalamus.

    3. the cause of exercise hyperventilation.

    4. not influenced by medullary rhythmicity area.

    Which of the statements are correct?

    1. 1 and 4

    2. 1 and 2

    3. 1, 2 and 3

    4. 2, 3 and 4

  6. The given figure variation of plasma level with urinary excretion. Based on this, the transport maximum for glucose (TmG) will be

    1. 200 mg/min

    2. 300 mg/min

    3. 350 mg/min

    4. 375 mg/min

  7. Which one of the following mechanisms is not involved in the regulation of blood pH by the kidneys?

    1. Reabsorption of HCO3 by renal tubular cells

    2. Formation of ammonia and its elimination as NH4 + ion in the urine

    3. Transport of reduced haemoglobin to kidney to liberate the acid ion

    4. Formation of Na2HPO4 and its elimination through the urine

  8. Lipase present in the stomach does not play a significant role in the digestion of dietary lipids because of

    1. Antilipase factors in gastric juice

    2. Intrinsic factor in gastric juice

    3. Mucous secretions

    4. Acidity of gastric juice

  9. Congenital abetalipoproteinemia is due to decreased synthesis of

    1. Apolipoprotein B − 48 in the intestinal mucosal cells

    2. Apolipoprotein B − 100 in the intestinal mucosal cells

    3. Apolipoprotein a-II the intestinal mucosal cells

    4. Apolipoprotein C-II in the liver

  10. The rate limiting step in glycolytic process is

    1. Glucose to glucose-6-phosphate

    2. Fructose-6-phosphate to fructose-1, 6-diphosphate

    3. pyruvate to lactate

    4. phosphoenolpyruvate to pyruvate

  11. Muscle glycogen cannot contribute directly to blood glucose level because

    1. muscle glycogen cannot be converted into glycose-6-phosphate

    2. muscle lacks phosphoglucoisomerase

    3. muscle does not contain glucokinase

    4. muscle lacks glucose-6-phosphatase

  12. Genetic information originates from

    1. cistrons of DNA

    2. anticodons of tRNA

    3. histones of nucleoproteins

    4. codons of mRNA

  13. What is the function of the acceptor arm of tRNA molecules?

    1. It binds with specific amino acids to form aminoacyl tRNA

    2. It helps in the recognition of the codon of mRNa

    3. It helps in the transfer of mRNA from the nucleus to the cytoplasm

    4. It binds with the initiation factors to form the initiation complex during protein synthesis

  14. The codons code for the same amino acid in all organisms. Therefore they are

    1. non overlapping

    2. degenerate

    3. universal

    4. unambiguous

  15. Which one of the following sub-units of a ribosome binds to the mRNA to initiate protein synthesis?

    1. 60 S

    2. 60 S GTP complex

    3. 40 S

    4. 40 S ATP complex