Questions and answers for exam Preparation

MCQs

Total Questions : 150 | Page 4 of 15 pages

Question 31. Which of the following is incorrect regarding pair wise sequence alignment?

The most fundamental process in this type of comparison is sequence alignment
It is an important first step toward structural and functional analysis of newly determined sequences
This is the process by which sequences are compared by searching for common character patterns and establishing residue-residue correspondence among related sequences
It is the process of aligning multiple sequences

Discuss Question

Answer: Option D. -> It is the process of aligning multiple sequences
Answer: (d).It is the process of aligning multiple sequences

Question 32. Which of the following is incorrect about evolution?

The macromolecules can be considered molecular fossils that encode the history of millions of years of evolution
The building blocks of these biological macromolecules, nucleotide bases, and amino acids form linear sequences that determine the primary structure of the molecules
DNA and proteins are products of evolution
The molecular sequences barely undergo changes

Discuss Question

Answer: Option D. -> The molecular sequences barely undergo changes
Answer: (d).The molecular sequences barely undergo changes

Question 33. The presence of evolutionary traces is because some of the residues that perform key functional and structural roles tend to be preserved by natural selection; other residues that may be less crucial for structure and function tend to mutate more frequently.

True
False
May be True or False
Can't say

Discuss Question

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

Question 34. If the two sequences share significant similarity, it is extremely ______ that the extensive similarity between the two sequences has been acquired randomly, meaning that the two sequences must have derived from a common evolutionary origin.

unlikely
possible
likely
relevant

Discuss Question

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

Question 35. The degree of sequence variation in the alignment reveals evolutionary relatedness of different sequences, whereas the conservation between sequences reflects the changes that have occurred during evolution in the form of substitutions, insertions, and deletions.

True
False
May be True or False
Can't say

Discuss Question

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

Question 36. Sequence similarity can be quantified using ________ homology is a ______ statement.

percentages, quantitative
percentages, qualitative
ratios, qualitative
ratios, quantitative

Discuss Question

Answer: Option B. -> percentages, qualitative
Answer: (b).percentages, qualitative

Question 37. Sometimes, it is also possible that two sequences have derived from a common ancestor, but may have diverged to such an extent that the common ancestral relationships are not recognizable at the sequence level.

True
False
May be True or False
Can't say

Discuss Question

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

Question 38. Which of the following is incorrect regarding sequence homology?

Two sequences can homologous relationship even if have do not have common origin
It is an important concept in sequence analysis
When two sequences are descended from a common evolutionary origin, they are said to have a homologous relationship
When two sequences are descended from a common evolutionary origin, they are said to share homology

Discuss Question

Answer: Option A. -> Two sequences can homologous relationship even if have do not have common origin
Answer: (a).Two sequences can homologous relationship even if have do not have common origin

Question 39. Sequence similarity and sequence identity are synonymous for nucleotide sequences and protein sequences as well.