Questions and answers for exam Preparation

MCQs

Total Questions : 100 | Page 9 of 10 pages

Question 81. Phylogenetic analysis of a set of sequences that aligns ______ is straightforward because the positions that correspond in the sequences can be readily identified in a ______ of the sequences.

very well, multiple sequence alignment
in a haphazard manner, multiple sequence alignment
in a distorted way, multiple sequence alignment
very well, self alignment

Discuss Question

Answer: Option A. -> very well, multiple sequence alignment
Answer: (a).very well, multiple sequence alignment

Question 82. In the bootstrap method, for branches in the predicted tree topology to be significant, the resampled data sets should frequently predict the same branches.

True
False
May be True or False
Can't say

Discuss Question

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

Question 83. The choice of a suitable multiple sequence alignment method depends on the degree of variation among the sequences.

True
False
May be True or False
Can't say

Discuss Question

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

Question 84. In the bootstrap method, the data are resampled by _____ choosing _____ columns from the aligned sequences to produce, in effect, a new sequence alignment of the _____

randomly, horizontal, same length
specifically, vertical, different lengths
randomly, vertical, same length
randomly, vertical, different lengths

Discuss Question

Answer: Option C. -> randomly, vertical, same length
Answer: (c).randomly, vertical, same length

Question 85. For sequences that have ________ a phylogenetic analysis is __________

diverged considerably, more challenging
not diverged, more challenging
diverged considerably, less challenging
diverged considerably, a less work to do

Discuss Question

Answer: Option A. -> diverged considerably, more challenging
Answer: (a).diverged considerably, more challenging

Question 86. Which of the following is incorrect regarding the terminologies of phylogenetics?

The connecting point where two adjacent branches join is called a node
Node represents an inferred ancestor of extant taxa
At the tips of the branches are long lost species or sequences
The lines in the tree are called branches

Discuss Question

Answer: Option C. -> At the tips of the branches are long lost species or sequences
Answer: (c).At the tips of the branches are long lost species or sequences

Question 87. Because there is no indication of which node represents an ancestor, there is no direction of an evolutionary path in an unrooted tree.

True
False
May be True or False
Can't say

Discuss Question

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

Question 88. Molecular clock is an assumption by which molecular sequences evolve at varying rates.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option B. -> False
Answer: (b).False

Question 89. Which of the following is incorrect regarding the terminologies of phylogenetics?

The branching pattern in a tree is called tree topology
When all branches bifurcate on a phylogenetic tree, it is referred to as dichotomy
In case of dichotomy, each ancestor divides and gives rise to multiple descendants
An unrooted phylogenetic tree does not assume knowledge of a common ancestor

Discuss Question

Answer: Option C. -> In case of dichotomy, each ancestor divides and gives rise to multiple descendants
Answer: (c).In case of dichotomy, each ancestor divides and gives rise to multiple descendants

Question 90. Which of the following is incorrect regarding the terminologies of phylogenetics?

A group of taxa descended from a single common ancestor is defined as a clade or monophyletic group
In a monophyletic group, two taxa share a unique common ancestor shared by other taxa as well
Lineage is often synonymous with a tree branch leading to a defined monophyletic group
When a number of taxa share more than one closest common ancestors, they do not fit the definition of a clade. In this case, they are referred to as paraphyletic

Discuss Question

Answer: Option B. -> In a monophyletic group, two taxa share a unique common ancestor shared by other taxa as well
Answer: (b).In a monophyletic group, two taxa share a unique common ancestor shared by other taxa as well