Online Test Series 41

[MedMRI]

1. Question

Alpha helix and Beta pleated sheet are examples of:

1. Secondary structure
2. Tertiary structure
3. Primary structure
4. Quaternary structure 

2. Question

Cytochrome C of the bacteria has 50% identity of amino acid sequence with that of human. Which of the following is the most conserved parameter in these two proteins?

1. Tertiary structure
2. Amino acid sequence
3. Quarternary structure
4. Loop and turn segments 

3. Question

In which of the following conditions the level of creatinine kinase 1 increases ?

1. Kidney damage
2. Myocardial ischemia
3. Brain Ischemia
4. Electrical cardioversion 

4. Question

A middle aged woman on oral contraceptives for many years, developed neurological symptoms such as depression, irritability, nervousness and mental confusion. Her hemoglobin level was 8g/dl. Biochemical investigations revealed that she was excreting highly elevated concentrations of xanthurenic acid in urine. She also showed high levels of triglycerides and cholesterol in serum. All of the above findings are most probably related to vitamin B6 deficiency caused by prolonged oral contraceptive use except :

1. Increased triglyceride and cholesterol level
2. Neurological symptoms by decreased synthesis of biogenic amines
3. Increased urinary xanthurenic acid excretion
4. Decreased hemoglobin level 

5. Question

A young man finds that every time he eats dairy products he feels very uncomfortable. His stomach becomes distended. He develops gas and diarrhea frequently. These symptoms do not appears when he eats foods other than dairy products. Which of the following is the most likely enzyme in which this young man is deficient?

1. Sucrase
2. B-galactosidase
3. alpha-amylase
4. alpha-glucosidase 

6. Question

A person on a fat free carbohydrate rich diet continues to grow obese. Which of the following lipoproteins is likely to be elevated in his blood?

1. Chylomicrons
2. VLDL
3. HDL
4. LDL 

7. Question

Which of the following elements is known to influence the body’s ability to handle oxidative stress ?

1. Iron
2. Calcium
3. Potassium
4. Selenium 

8. Question

A small calcium binding protein that modifies the activity of many enzymes and other proteins in response to changes of Ca2+ concentration, is known as:

1. Cycline
2. Calmodulin
3. Kinesin
4. Collagen 

9. Question

Which of the following is a membrane bound enzyme that catalyzes the formation of cyclic AMP from ATP?

1. Polymerase
2. Adenylate cyclase
3. ATP synthase
4. Tyrosine Kinase 

10. Question

Which of the following substances acts to increase the release of Ca2+ from endoplasmic reticulum ?

1. Parathyroid hormone
2. Inositol triphosphate
3. 1,25 dihydroxy cholecalciferol
4. Diacylglycerol 

11. Question

Proteins targeted for destruction in eukaryotes are covalently linked to :

1. Pepsin
2. Ubiquitin
3. Clathrin
4. Laminin 

12. Question

Which of the following group of proteins assist in the folding of other proteins?

1. Proteases
2. Proteosomes
3. Templates
4. Chaperones 

13. Question

The transmembrane region of protein is likely to have

1. A disulphide loop
2. A stretch of hydrophilic amino acids
3. Alternating hydrophilic and hydrophobic amino acids
4. A stretch of hydrophobic amino acids 

14. Question

Which of the following can be a homologous substitution for valine in hemoglobin?

1. Isoleucine
2. Phenylalanine
3. Glutamic acid
4. Lysine 

15. Question

An enzyme that makes a double stranded DNA copy from a single stranded RNA template molecule is known as:

1. RNA polymerase
2. DNA polymerase
3. Reverse transcriptase
4. Phosphokinase