A) Retinol, retinal and retinoic acid B) Retinol, retinal and tetrahydrofolate C) Retinol, conjugase and retinoic acid D) PABA, retinal and retinaldehyde Answer (Select an option above to get the answer):
A) Linear number and order of the amino acids present B) Regular conformational forms of a protein C) Complete three-dimensional structure of the polypeptide units of a given protein D) Subunit structure of the protein Answer (Select an option above to get the answer):
(Single Best Answer) Question 4014: Excessive ultraviolet (UV) radiation is harmful to life. The damage caused to the biological systems by ultraviolet radiation is by ?
A) Inhibition of DNA synthesis B) Formation of thymidine dimers C) Ionization D) DNA fragmentation Answer (Select an option above to get the answer):
A) It is one of the most important secondary structure B) It has a net dipole moment C) All hydrogen bonds are aligned in the same direction D) Long stretches of left handed alpha-helices occur in proteins Answer (Select an option above to get the answer):
(Single Best Answer) Question 4017: A young boy who was driving motorcycle at a high speed collided with a tree and was thrown on his right shoulder. Though there was no fracture, his right arm was medically rotated and forearm pronated. The following facts concerning this patient are correct, except ?
A) The injury was at Erb's point B) A lesion of C5 and C6 was present C) The median and ulnar nerves were affected D) Supraspinatus, infraspinatus, subclavius and biceps brachii were paralysed Answer (Select an option above to get the answer):
(Single Best Answer) Question 4018: In a vehicular accident, the musculocutaneous nerve was completely severed, but still the person was able to weakly flex the elbow joint. All of the following muscles are responsible for this flexion, except ?
A) Brachioradialis B) Flexor carpi radialis C) Ulnar head of pronator teres D) Flexor carpi ulnaris Answer (Select an option above to get the answer):
(Single Best Answer) Question 4019: Misexpression of which of the following homoeobox genes alters the position of the forelimbs during development ?
A) HOXA7 B) HOXB8 C) HOXC9 D) HOXD10 Answer (Select an option above to get the answer):