TLS Online TPP Program

#Question id: 23684


How does a bacterial cell protect its own DNA from restriction enzymes?

#Unit 13. Methods in Biology
  1. adding methyl groups to adenines and cytosines
  2. using DNA ligase to seal the bacterial DNA into a closed circle
  3. adding histones to protect the double-stranded DNA
  4. forming ʺsticky endsʺ of bacterial DNA to prevent the enzyme from attaching
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TLS Online TPP Program

#Question id: 848

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the brain diseases is not caused by the misfolding of brain proteins in mammals

TLS Online TPP Program

#Question id: 849

#Unit 1. Molecules and their Interaction Relevant to Biology

The rigidity of the peptide unit and the restricted set of allowed phi and psi angles limits the number of structures accessible to the unfolded form sufficiently to allow:-

TLS Online TPP Program

#Question id: 850

#Unit 1. Molecules and their Interaction Relevant to Biology

The experimental inverse of protein structure prediction, has provided insights into protein folding and stability. Protein design attempts to construct an amino acid sequence that will form a structure such as a sandwich of β sheets or a bundle of α helices;

TLS Online TPP Program

#Question id: 851

#Unit 1. Molecules and their Interaction Relevant to Biology

Methods is the Rosetta program, formulated by David Baker. To satisfy the program’s computational needs, a volunteer network of ∼100,000 computers, known as Rosetta@home, provides the 500,000 or so hours of processing time required to generate a structure;

TLS Online TPP Program

#Question id: 852

#Unit 1. Molecules and their Interaction Relevant to Biology

.________ enzyme revealed the relation between the amino acid sequence of a protein and its conformation.

TLS Online TPP Program

#Question id: 853

#Unit 1. Molecules and their Interaction Relevant to Biology

In the presence of a large excess of _______ the disulfides (cystines) are fully converted into sulfhydryls (cysteines).