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TLS Online TPP Program

#Question id: 11122

Phylogenetic hypotheses (such as those represented by phylogenetic trees) are strongest when

#Unit 9. Diversity of Life Forms
  1. they are based on amino acid sequences from homologous proteins, as long as the genes that code for such proteins contain no introns.
  2. each clade is defined by a single derived character.
  3. they are supported by more than one kind of evidence, such as when fossil evidence corroborates molecular evidence.
  4. they are accepted by the foremost authorities in the field, especially if they have won Nobel Prizes.
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TLS Online TPP Program

#Question id: 23752

#Unit 1. Molecules and their Interaction Relevant to Biology

Which one of the following is always associated with a 'tree'?
TLS Online TPP Program

#Question id: 23751

#Unit 1. Molecules and their Interaction Relevant to Biology

Which one of the following is always associated with 'Justice'?
TLS Online TPP Program

#Question id: 743

#Unit 1. Molecules and their Interaction Relevant to Biology

Glycophorin, an integral membrane protein, has a single transmembrane alpha helix. Which of the following idealized hydropathy plots most likely represents the transmembrane nature of glycophorin?
TLS Online TPP Program

#Question id: 742

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following

Conformation

Phi

Psi

Omega

A. Alpha helix

I. -57

P. -47

X. 180

B. B sheet

II. -135

Q. +135

Y. 0

C. Polyproline I

III. -83

R. +158

D. Polyproline II

IV. -78

S. +149

TLS Online TPP Program

#Question id: 741

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of following statements are INCORRECT about secondary structure of proteins

A. Long block of Glu residues segment of the chain will not form an alpha helix at pH 7.0 but it ll take helical confirmation below its pKR value

B. Long block of Lys residues segment of the chain will not form an alpha helix at pH 7.0 but it ll take helical confirmation above its pKR value

C. Long block of Ala residues segment of the chain will not form an alpha helix at pH 7.0 but it ll take helical confirmation below its pKR value

D. Histidine side chain remain uncharged over pH range 3-6
TLS Online TPP Program

#Question id: 740

#Unit 1. Molecules and their Interaction Relevant to Biology

The conformation of the backbone of a polypeptide is described completely by the angle(s) of rotation about which bond(s)?