181 Lec - PPT3
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Questions and Answers

Which molecular descriptor is based on the simple count of features?

  • Dipole Moment
  • Hydrophobicity
  • Ring systems (correct)
  • London Dispersion Forces

What is the purpose of molecular descriptors?

  • To represent the 2D structure of a molecule
  • To manipulate and analyze chemical structural information (correct)
  • To determine the activity and transport of drugs
  • To calculate the physicochemical properties of a molecule

Which property is important in determining the activity and transport of drugs?

  • Hydrophobicity (correct)
  • Octanol-water partition coefficient
  • Molecular weight
  • Hydrogen bond acceptors

Which of the following is an example of a molecular walk count?

<p>MWC01 (D)</p> Signup and view all the answers

Which type of fingerprints are not directly interpretable?

<p>2D Fingerprints (D)</p> Signup and view all the answers

What do pharmacophore keys encode?

<p>Receptor binding affinity (D)</p> Signup and view all the answers

What is the purpose of 3D Fragment Screens?

<p>To encode spatial relationships between features of a molecule (B)</p> Signup and view all the answers

Which method is commonly used to model the partition coefficient between n-octanol and water?

<p>Additive scheme (B)</p> Signup and view all the answers

What is the advantage of the fragment-based approach in estimating log P?

<p>Takes electronic interactions into account (C)</p> Signup and view all the answers

What is the formula for calculating the molar refractivity (MR)?

<p>MR=(n^2-1)MW/(n^2+2)d (B)</p> Signup and view all the answers

Which type of indices can be calculated from the distance matrix of a molecule?

<p>3D topographical indices (C)</p> Signup and view all the answers

What is the coefficient of variation?

<p>The standard deviation divided by the mean (A)</p> Signup and view all the answers

What is the purpose of scaling data in data analysis?

<p>To ensure that each descriptor contributes equally to the analysis (B)</p> Signup and view all the answers

What is the range of values for the correlation coefficient?

<p>-1.0 to 1.0 (C)</p> Signup and view all the answers

Which program provides access to several hundred different E-state descriptors?

<p>Molconn-Z program (D)</p> Signup and view all the answers

What is the definition of the perturbation ΔIij?

<p>The number of bonds between the atom i and each of the other atoms, j (C)</p> Signup and view all the answers

How can atomic E-states be combined into a whole-molecule descriptor?

<p>By calculating the mean-square value over all atoms (B)</p> Signup and view all the answers

Which term is used to describe the new variables that are a linear combination of the original variables?

<p>Principal components (D)</p> Signup and view all the answers

What is the purpose of introducing principal components?

<p>To simplify graphical data display (B)</p> Signup and view all the answers

Which of the following is true about the degree of an atom in a molecule?

<p>The degree is equal to the number of adjacent non-hydrogen atoms. (D)</p> Signup and view all the answers

What is the formula for calculating the simple delta value (δi) for an atom?

<p>δi = number of sigma electrons for atom i - number of hydrogen atoms bonded to atom i (A)</p> Signup and view all the answers

What is the formula for calculating the valence delta value (δiv) for an atom?

<p>δiv = number of valence electrons for atom i - number of hydrogen atoms bonded to atom i (D)</p> Signup and view all the answers

What is the formula for calculating the first-order kappa index for a molecule?

<p>1κ = number of bonds in the linear molecule (C)</p> Signup and view all the answers

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