Free Net Life Science Study Materials

Life Sciences JRF NET Model Question Paper for June 2017 Examination (Set 3/4)


NAM and NAG Structure

CSIR JRF/NET Life Science Exam
June 2017 (I) Model Question Paper 3/4
(Practice Questions with Answer Key)

(1). During glycogen metabolism, the glycogen in the cell is first breakdown to glucose-1-phosphate by the enzyme glycogen phosphorylase. This reaction is a______

a.       Glycolysis reaction
b.      Hydrolysis reaction
c.       Phosphorolysis reaction
d.      Glucolysis reaction

Learn more: MCQ on Carbohydrates (3 sets)

(2). Which of the following genes is activated as ‘oncogenes’ in some human tumors?

a.       K-ras
b.      BRCA1
c.       RB-1
d.      APC

(3). If the frequency of males affected with an X- linked recessive condition in a human population is 0.10 (one in ten) what will be the expected frequency of affected females?

a.       0.0001
b.      0.001
c.       O.02
d.      0.01

(4). What are the assumptions of Hardy-Weinberg equilibrium?

a.       Small population size, random mating no selection, no migration, no mutation
b.      Large population size, random mating, no selection, no migration, no mutation
c.       Large population size, random mating, heterozygotes survive the best, no migration, no mutation
d.      Large population size, random mating, no selection, migrants enter form other populations, no mutation

Learn more: Hardy-Weinberg Equilibrium and Population Genetics (Notes)

(5). The receptor for which of the following hormone is a transcription factor?

a.       Insulin
b.      Glucagon
c.       Estrogen
d.      Adrenalin

Continue reading

Free Net Life Science Study Materials

NET Life Sciences Model Question Paper for June 2017 Exam (Set 2/4)


two chiral centre in amino acids

CSIR JRF/NET Life Science Exam
June 2017 (I) Model Question Paper 2/4
(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

Learn more: MCQ on Amino Acids (4 sets)

(4). The H – C – H angle in methane is:

a.       109.5⁰
b.      90⁰
c.       120⁰
d.      180⁰

(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

Continue reading