Biology Exam Preparation Portal. Preparing with U 4 ur exams...

CSIR UGC NET JRF Life Sciences Part B (June 2014)

11. During protein synthesis in prokaryotes, the peptidyl transferase activity required for peptide bond formation is due to
a) ribosomal protein
b) aminoacyl tRNA
c) 16S ribosomal RNA
d) 23S ribosomal RNA

12. The distance between bacterial genes as determined from interrupted mating experiments are measured in units of
a)cM
b)bp
c)minutes
d)micrometers

13. Branchiostomaisa
a) deuterostome and schizocoelomate
b) protostome abd schizocoelomate
c) deuterostome and enterocoelomate
d) protostome and anterocoelomate

14. The most important reproductive strategies of big trees in a forest are
a) Earlier age at first reproduction and production of large number of small seeds
b) Earlier age at first reproduction and production of a small number of large seeds
c) Later age at first reproduction and production of a large number of small seeds
d) Later age at first reproduction and production of a small number of large seeds

15. Which one of the following is unfavorable for protein folding?
a)conformational entropy
b) Hydrogen bonding
c) Vander Waals interaction
d)hydrophobic interaction

16. The organs ‘radula’ and ‘citellum’ are found in
a) Mollusca and Annelida, respectively
b) Annelida and Mollusca , respectively
c)Coelenterata and Echinodermata, respectively
d) Echinodermata and Coelenterata, respectively

17.The peptide unit (-CO-NH-) is planar due to
a) Restriction around C-C bond
b) Restriction around C-N bond
c) Restriction around N-C bond
d) Hydrogen bonding between carbonyl oxygen and imino hydrogen of the peptide backbone.

18. Molecules primarily responsible for the formation of lipid raft are
Space-filling models of sphingomyelin (a) and cholesterol (b).

a) sphingolipids and cholesterol
b) phosphatidyl inositol and cholesterol
c) glycosylphosphatidyl inositol and chloesterol
d) phosphatidyl serine and phosphatidyl serine

19. Membrane bound and free ribosomes, are structurally identical, but differ only at a given time in terms of association with
a) Phospholipids
b) nascent proteins
c) glycosylated proteins
d) acetylated proteins

20. A pathogen like mycobacterium, which colonizes inside the cells of the host, is likely to be least affected by which one of the following host immune defence mechanisms?
a) Cytokines
b) cell mediated immune response
c) cd+4 T lymphocytes
d)Humoral immnune response
Learn more:
Answers
11. d) 23S ribosomal RNA
12. c)minutes
13. c) deuterostome and enterocoelomate
14. d) Later age at first reproduction and production of a small number of large seeds
15. a)conformational entropy
16. a) Mollusca and Annelida, respectively
17. b) Restriction around C-N bond
18. a) sphingolipids and cholesterol
Lipid rafts generally contain 3 to 5-fold the amount of cholesterol found in the surrounding bilayer. Also, lipid rafts are enriched in sphingolipids such as sphingomyelin, which is typically elevated by 50% compared to the plasma membrane.
19. b) nascent proteins
20. d)Humoral immnune response

Sharing is Caring ..... Please take 5 seconds to Share. Thank you...

0 comments:

Post a Comment

We love to hear from you! Leave us a comment.

© Biology Exams 4 U, AllRightsReserved.***Best viewed in Google Chrome and Mozilla firefox***

Maintained by BiologyExams4U.com