CSIR JRF/NET Life Science Exam
June 2017 (I) Model Question Paper 2/5
(Practice Questions with Answer Key)
(1). The quaternary structure of human hemoglobin is best described as:
a. Dimer of two myoglobin dimers
b. Tetramer of identical subunits
c. Tetramer of four different subunits
d. Tetramer of two different subunits
(2). Which of the following statements is NOT true for Fluorescence Resonance Energy Transfer (FRET)?
a. Donor and acceptor molecules mush be in close proximity
b. Absorption spectrum of the acceptor must overlap fluorescence emission spectrum of the donor
c. Donor and acceptor transition dipole orientation must be approximately parallel
d. Energy transfer is directly proportional to the size of the proteins.
(3). Which of the amino acid pairs have two chiral centres?
a. Proline and Arginine
b. Leucine and Isoleucine
c. Isoleucine and Threonine
d. Methionine and Cysteine
(4). The H – C – H angle in methane is:
(5). Difference between the R- and T- states of hemoglobin is:
a. Dimeric and tetrameric structures
b. Oxy- and deoxy- states
c. Binding to ferrous and ferric ions
d. Folded and unfolded states