Questions and answers for exam Preparation

MCQs

Total Questions : 90 | Page 7 of 9 pages

Question 61. The Second assumption in predicting RNA secondary structure is that the energy associated with any position in the structure is _____ influenced by local sequence and structure.

only
not at all
partially
never

Discuss Question

Answer: Option A. -> only
Answer: (a).only

Question 62. The third assumption in predicting RNA secondary structure is that the structure is assumed to be formed by _____ of the chain back on itself in a manner that ________

crossing, produces knots
crossing, does not produce any knots
folding, produces knots
folding, does not produce any knots

Discuss Question

Answer: Option D. -> folding, does not produce any knots
Answer: (d).folding, does not produce any knots

Question 63. Nussinov and Jacobson (1980) were the first to design a precise and efficient algorithm for predicting secondary structure.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 64. Martinez (1984) made a list of possible double-stranded regions, and these regions were then given weights in proportion to their equilibrium constants, calculated by ______

the Boltzmann function [exp (-∆G/RT²)]
the Boltzmann function [exp (-∆G/RT)]
the Boltzmann function [exp (-∆G/RT -T)]
the Boltzmann function [exp (∆G/RT)]

Discuss Question

Answer: Option B. -> the Boltzmann function [exp (-∆G/RT)]
Answer: (b).the Boltzmann function [exp (-∆G/RT)]

Question 65. In 1971, first estimation of the energy associated with regions of secondary structure by extrapolation from studies with small molecules was done and then an attempt was made to predict which configurations of larger molecules were the most energetically stable.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 66. A general theory for modeling strings of symbols, such as bases in DNA sequences, has been developed by linguists. There is a hierarchy of these so-called transformational grammars that deal with situations of increasing complexity.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 67. In a SCFG, each production of a non-terminal symbol has an associated probability for giving rise to the resulting product, and there are a set of productions, each giving a different result.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 68. The application of SCFGs to RNA secondary structure analysis is very similar in form to the probabilistic covariance models.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 69. ______ regions in sequences, such as those in RNA that will form secondary structures, are an example of such context-free sequences.

non-interlocking
non-Complementary
complementary
non-compatible

Discuss Question

Answer: Option C. -> complementary
Answer: (c).complementary

Question 70. The use of SCFGs in RNA secondary structure production analysis is in fact very similar to that of the covariance model, with the grammatical productions resembling the nodes in the ordered binary tree.