TLS Online TPP Program

#Question id: 3978


The 5'-terminal cap structure of eukaryotic mRNAs is a(n):

#Unit 3. Fundamental Processes
  1. 7-methylcytosine joined to the mRNA via a 2',3'-cyclic linkage.

  2.  7-methylguanosine joined to the mRNA via a 5' -> 3' diphosphate linkage.

  3. 7-methylguanosine joined to the mRNA via a 5' -> 5' triphosphate linkage.

  4. N6-methyladenosine joined to the mRNA via a 5' -> 5' phosphodiester bond.

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TLS Online TPP Program

#Question id: 12752

#Unit 13. Methods in Biology

Which of the following cannot be used to remove protein contamination from nucleic acids?

TLS Online TPP Program

#Question id: 28740

#Unit 2. Cellular Organization

Which of the following is a major sites of oxygen utilization ?

TLS Online TPP Program

#Question id: 9053

#Unit 9. Diversity of Life Forms

Which of the following might be an investigation of microclimate?

TLS Online TPP Program

#Question id: 722

#Unit 1. Molecules and their Interaction Relevant to Biology

The structure of alpha helix is stabilized by hydrogen bonds between the hydrogen atom attached to the electronegative nitrogen atom of a peptide linkage and the electronegative carbonyl oxygen atom of the fourth amino acid on the amino-terminal side of that peptide bonds. Within the helix, every peptide bond (except those close to each end of the helix) participates in such hydrogen bonding. Each successive turn of the helix is held to adjacent turns by three to four hydrogen bonds, conferring significant stability on the overall structure. Which of the following are correct statements regarding these findings?

A. At the ends of a helical segment, there are always three or four amide carbonyl or amino groups that participate in this stabilised helical pattern of hydrogen bonding.

B. Helix ends are exposed to the surrounding solvent, where they hydrogen-bond with water, or other parts of the protein may cap the helix to provide the needed hydrogen-bonding partners.

C. Helix can form in polypeptides consisting of either L- or D-amino acids but a D-amino acid will disrupt a regular structure consisting of L-amino acids, and vice versa.

D. The most stable form of a helix consisting of L-amino acids is left-handed.

E. 310 helix occupies similar place as turns in Ramachandran plot due to its confirmation

TLS Online TPP Program

#Question id: 5169

#General Aptitude

For real values of m, (m-1) (m-3) (m-4) (m-6) +10 is