Questions and answers for exam Preparation

MCQs

Total Questions : 100 | Page 5 of 10 pages

Question 41. Sometimes a tree-building method may result in several equally optimal trees. A consensus tree can be built by showing the commonly resolved bifurcating portions and collapsing the ones that disagree among the trees, which results in a polytomy.

True
False
May be True or False
Can't say

Discuss Question

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

Question 42. For unrooted trees, the number of unrooted tree topologies (NU) is ________

NU = (2n− 5)!/2ⁿ⁻³(n− 5)!
NU = (2n− 5)!/2ⁿ⁻³(n− 3)!
NU = (2n− 5)!/2¯²(n− 3)!
NU = (2n− 5)!/2ⁿ(n− 3)!

Discuss Question

Answer: Option B. -> NU = (2n− 5)!/2ⁿ⁻³(n− 3)!
Answer: (b).NU = (2n− 5)!/2ⁿ⁻³(n− 3)!

Question 43. The number of rooted trees (NR) for n taxa is ______

NR = (2n− 3)!/2ⁿ⁺² (n− 2)!
NR = (2n− 3)!/2ⁿ (n− 2)!
NR = (2n− 3)!/2ⁿ⁻² (n− 5)!
NR = (2n− 3)!/2ⁿ⁻² (n− 2)!

Discuss Question

Answer: Option D. -> NR = (2n− 3)!/2ⁿ⁻² (n− 2)!
Answer: (d).NR = (2n− 3)!/2ⁿ⁻² (n− 2)!

Question 44. It can be computationally very demanding to find a true phylogenetic tree when the number of sequences is large.

True
False
May be True or False
Can't say

Discuss Question

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

Question 45. Which of the following is incorrect statement about Molecular Markers?

For studying very closely related organisms, protein sequences are preferred
The decision to use nucleotide or protein sequences depends on the purposes of the study
For constructing molecular phylogenetic trees, one can use either nucleotide or protein sequence data
The decision to use nucleotide or protein sequences depends on the properties of the sequences

Discuss Question

Answer: Option A. -> For studying very closely related organisms, protein sequences are preferred
Answer: (a).For studying very closely related organisms, protein sequences are preferred

Question 46. For studying the evolution of ________ divergent groups of organisms, one may choose either ______ nucleotide sequences, such as ribosomal RNA or protein sequences.

less widely, slowly evolving
more widely, slowly evolving
more widely, rapidly evolving
less widely, rapidly evolving

Discuss Question

Answer: Option B. -> more widely, slowly evolving
Answer: (b).more widely, slowly evolving

Question 47. In many cases ______ sequences are preferable to ______ sequences because they are relatively ____ conserved.

protein, nucleotide, less
nucleotide, protein, less
protein, nucleotide, more
nucleotide, protein, more

Discuss Question

Answer: Option C. -> protein, nucleotide, more
Answer: (c).protein, nucleotide, more

Question 48. Protein sequences can remain the same while the corresponding DNA sequences have more room for variation.

True
False
May be True or False
Can't say

Discuss Question

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

Question 49. DNA sequences are sometimes more biased than protein sequences because of preferential codon usage in different organisms.

True
False
May be True or False
Can't say

Discuss Question

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

Question 50. In Jukes–Cantor Model to correct evolutionary distances, A formula for deriving evolutionary distances that include hidden changes is introduced by using a logarithmic function. It is ____