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This section includes 113 Mcqs, each offering curated multiple-choice questions to sharpen your Bioinformatics knowledge and support exam preparation. Choose a topic below to get started.
51. |
DNA microarrays measure “absolute” mRNA expression levels without arbitrary reference standards, whereas SAGE indicates the relative expression levels. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» C. May be True or False | |
52. |
The _____ resolution genome map is the genomic DNA sequence that can be considered as a type of ______ map describing a genome at the single base-pair level. |
A. | highest, physical |
B. | lowest, physical |
C. | highest, cytological |
D. | lowest, cytological |
Answer» B. lowest, physical | |
53. |
Which of the following is untrue about DNA sequencing? |
A. | It is now routinely carried out using the Sanger method |
B. | This doesn’t make use of DNA polymerases |
C. | This involves the synthesis of DNA chains of varying length |
D. | The DNA synthesis is stopped by adding dideoxynucleotides |
Answer» C. This involves the synthesis of DNA chains of varying length | |
54. |
In DNA sequencing, the fluorescent traces of the DNA sequences are read by a computer program that assigns bases for each peak in a chromatogram. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
55. |
The shotgun approach _______ sequences clones from _____ of cloned DNA. |
A. | randomly, one end |
B. | randomly, both ends |
C. | specifically, both ends |
D. | specifically, one end |
Answer» C. specifically, both ends | |
56. |
Which of the following is untrue about Gene Order Comparison? |
A. | When the order of a number of linked genes is conserved between genomes, it is called synteny |
B. | Generally, gene order is much more conserved compared with gene sequences |
C. | Generally, gene order is much less conserved compared with gene sequences |
D. | It is in fact rarely observed among divergent species |
Answer» C. Generally, gene order is much less conserved compared with gene sequences | |
57. |
Which of the following is an incorrect statement about the terminologies related to protein sorting? |
A. | Subcellular localization is an integral part of protein functionality |
B. | Many proteins exhibit functions only after being transported to certain compartments of the cell |
C. | All the proteins exhibit functions after being transported to certain compartments of the cell |
D. | Protein sorting is also known as protein targeting |
Answer» D. Protein sorting is also known as protein targeting | |
58. |
Which of the following is a wrong statement? |
A. | To assume biological activity, many nascent polypeptides have to be covalently modified before or after the folding process |
B. | In eukaryotic cells most modifications take place in the endoplasmic reticulum and the Golgi apparatus |
C. | The modifications in eukaryotic cells include proteolytic cleavage; formation of disulfide bonds; addition of phosphoryl, methyl, acetyl, or other groups onto certain amino acid residues |
D. | The modifications in eukaryotic cells doesn’t include attachment of oligosaccharides or prosthetic groups to create mature proteins |
Answer» E. | |
59. |
Which of the following is untrue about SAGE Genie? |
A. | It is an NCBI web-based program |
B. | It allows matching of experimentally obtained SAGE tags to known genes |
C. | It provides an interface for visualizing human gene expression |
D. | It doesn’t filter out linker sequences from experimentally obtained SAGE tags |
Answer» E. | |
60. |
Which of the following is untrue about SAGE? |
A. | Sequencing is the most costly and time-consuming step |
B. | Here, sequencing is economical but time-consuming step |
C. | Sequencing is economical but time-reducing step |
D. | It is difficult to know how many tags need to be sequenced to get a good coverage of the entire transcriptome |
Answer» B. Here, sequencing is economical but time-consuming step | |
61. |
Which of the following is incorrect regarding 2D-Page? |
A. | Not all proteins can be separated by this method or stained properly |
B. | The stained gel can be scanned and digitized for image analysis |
C. | Membrane proteins are largely hydrophilic and readily solubilized |
D. | One of the challenges of this technique is the separation of membrane proteins |
Answer» D. One of the challenges of this technique is the separation of membrane proteins | |
62. |
Which of the following is untrue about the drawbacks of SAGE? |
A. | One or two sequencing errors in the tag sequence can lead to ambiguous or erroneous tag identification |
B. | Correctly sequenced SAGE tag sometimes may correspond to several genes or no gene at all |
C. | Correctly sequenced SAGE tag always corresponds to several genes |
D. | The drawback with this approach is the sensitivity to sequencing errors |
Answer» D. The drawback with this approach is the sensitivity to sequencing errors | |
63. |
Which of the following is untrue regarding expressed sequence tags (ESTs)? |
A. | One of the high throughput approaches to genome-wide profiling of gene expression is sequencing ESTs |
B. | They are short sequences obtained from cDNA clones |
C. | They serve as short identifiers of full-length genes |
D. | They are typically in the range of 800 to 900 nucleotides in length |
Answer» E. | |
64. |
Chloroplast localization signals are also located in the __________ terminus and are about 25 to 100 residues in length, containing very few _______ charged residues but many hydroxylated residues such as serine. |
A. | N, negatively |
B. | C, negatively |
C. | C, positively |
D. | N, positively |
Answer» B. C, negatively | |
65. |
SAGEmap is a SAGE database created by NCBI. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
66. |
To generate EST data, clones in the cDNA library are randomly selected for sequencing from either end of the inserts. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
67. |
The hierarchical approach is ____ and _____ than the shotgun approach because it involves an initial clone-based physical mapping step. |
A. | slower, less costly |
B. | faster, more costly |
C. | faster, less costly |
D. | slower, more costly |
Answer» E. | |
68. |
An alternative approach to determining protein–protein interactions is to use a large-scale affinity purification technique that involves attaching fusion tags to proteins and purifying the associated protein complexes in an affinity chromatography column. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
69. |
In the analysis of microarray data–If replicated datasets are available, rigorous statistical tests such as t-test and analysis of variance (ANOVA) can be performed to test the null hypothesis that a given data point is not significantly different from the mean of the data distribution. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
70. |
SAGExProfiler doesn’t provide information about overexpressed or silenced genes. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» C. May be True or False | |
71. |
The whole genome shotgun approach can produce a draft sequence very rapidly because it is based on the direct sequencing approach. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
72. |
Despite the multiple coverage, sometimes certain genomic regions remain unsequenced, mainly owing to cloning difficulties. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
73. |
Which of the following is incorrect about Self-Organizing Maps? |
A. | Clustering by SOMs is in principle similar to the k-means method |
B. | It doesn’t involve neural networks |
C. | The data points are initially assigned to the nodes at random |
D. | It starts by defining a number of nodes |
Answer» C. The data points are initially assigned to the nodes at random | |
74. |
Which of the following is untrue regarding UniGene? |
A. | It is an NCBI EST cluster database |
B. | Overlapping EST sequences are computationally processed to represent a single expressed gene |
C. | Each cluster is a set of overlapping EST sequences |
D. | The overlapping EST sequences are computationally processed to represent a set of expressed genes |
Answer» E. | |
75. |
The classic protein separation methods involve two-dimensional gel electrophoresis followed by gel image analysis. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
76. |
Which of the following is a wrong about AutoMotif? |
A. | It is a web server predicting protein sequence motifs |
B. | It doesn’t use SVM approach |
C. | In this process, the query sequence is chopped up into a number of overlapping fragments |
D. | The overlapping fragments from are query sequence are fed into different kernels (similar to nodes) |
Answer» C. In this process, the query sequence is chopped up into a number of overlapping fragments | |
77. |
Which of the following is not one of the training sets in SignalP? |
A. | Prokaryotes |
B. | Eukaryotes |
C. | Gram-positive bacteria |
D. | Gram-negative bacteria |
Answer» B. Eukaryotes | |
78. |
Which of the following is incorrect about Classification of microarray data? |
A. | For microarray data, clustering analysis identifies coexpressed and coregulated genes |
B. | For microarray data, clustering analysis identifies coexpressed but not coregulated genes |
C. | For microarray data, clustering analysis identifies and coregulated but not coexpressed genes |
D. | Genes within a category have more similarity in expression than genes from different categories. |
Answer» B. For microarray data, clustering analysis identifies coexpressed but not coregulated genes | |
79. |
Which of the following is untrue about LAGAN? |
A. | It stands for Limited Area Global Alignment of Nucleotides |
B. | It is a web-based program designed for pairwise alignment of small fragments of genomes only |
C. | It first finds anchors between two genomic sequences using an algorithm that identifies short, exactly matching words |
D. | Regions that have high density of words are selected as anchors |
Answer» C. It first finds anchors between two genomic sequences using an algorithm that identifies short, exactly matching words | |
80. |
A supervised analysis refers to classification of data into a set of predefined categories. For example, depending on the purpose of the experiment, the data can be classified into predefined ‘diseased’ or ‘normal’ categories. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
81. |
Which of the following is untrue regarding the classic yeast two-hybrid method? |
A. | It is used for the detection of Protein interactions |
B. | Method that relies on the interaction of “bait” and “prey” proteins in molecular constructs in yeast |
C. | DNA-binding domain and a trans-activation domain don’t necessarily interact |
D. | In this strategy, a two-domain transcriptional activator is employed as a helper for determining protein–protein interactions |
Answer» D. In this strategy, a two-domain transcriptional activator is employed as a helper for determining protein–protein interactions | |
82. |
Physical maps are constructed by using a chromosome walking technique. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
83. |
Which of the following is incorrect about a microarray? |
A. | It is a slide attached with a high-density array of immobilized DNA oligomers representing the entire genome of the species under study |
B. | Array of immobilized DNA oligomers cannot be cDNAs |
C. | Each oligomer is spotted on the slide and serves as a probe for binding to a unique complementary cDNA |
D. | It is the most commonly used global gene expression profiling method |
Answer» C. Each oligomer is spotted on the slide and serves as a probe for binding to a unique complementary cDNA | |
84. |
The signal sequences are typically _______ residues long, rich in _____ charged residues such as arginines as well as hydroxyl residues such as serines and threonines, but devoid of ______ charged residues. |
A. | 28 to 80, positively, negatively |
B. | 300 to 800, negatively, positively |
C. | 28 to 80, negatively, positively |
D. | 300 to 500, positively, negatively |
Answer» B. 300 to 800, negatively, positively | |
85. |
The hierarchical genome sequencing approach is ______ |
A. | entirely dissimilar to the shotgun approach |
B. | dissimilar to the shotgun approach |
C. | similar to the shotgun approach, but on a larger scale |
D. | similar to the shotgun approach, but on a smaller scale |
Answer» E. | |
86. |
Which of the following is incorrect about EULER? |
A. | It is an assembly algorithm |
B. | It uses a Eulerian Superpath approach, which is a polynomial algorithm |
C. | In this approach, a sequence fragment is broken down to tuples of five nucleotides |
D. | The tuples are distributed in a diagram with numerous nodes that are all interconnected |
Answer» D. The tuples are distributed in a diagram with numerous nodes that are all interconnected | |
87. |
TIGR Assembler is a UNIX program from TIGR for assembly of large shotgun sequence fragments. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
88. |
Which of the following is incorrect about Phrap? |
A. | It aligns individual fragments in a pairwise fashion using the Smith–Waterman algorithm |
B. | It doesn’t take input from Phred |
C. | It is used for sequence assembly |
D. | It is a UNIX program |
Answer» C. It is used for sequence assembly | |
89. |
Which of the following is incorrect about ARACHNE? |
A. | It accepts base calls with associated quality scores assigned by Phred as input |
B. | It is a free UNIX program |
C. | It is for the assembly of whole-genome shotgun reads |
D. | It doesn’t involve heuristic approach |
Answer» E. | |
90. |
VecScreen is a primarily aimed for sequence assembly. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» C. May be True or False | |
91. |
When a sequence is generated from ____ ends of a single clone, the distance between the two opposing fragments of a clone is fixed to ________ meaning that they are always separated by a distance defined by a _____ length (normally 1,000 to 9,000 bases). |
A. | both, an uncertain range, clone |
B. | one, an uncertain range, clone |
C. | both, a certain range, clone |
D. | both, a certain range, gene |
Answer» D. both, a certain range, gene | |
92. |
The major challenges in genome assembly are sequence errors, contamination by bacterial vectors, and repetitive sequence regions. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
93. |
Which of the following is incorrect regarding Automated Genome Annotation? |
A. | It exists because of the need to develop fast and automated methods to annotate the genomic sequences |
B. | The automated approach relies on homology detection |
C. | The automated approach doesn’t rely on heuristic sequence similarity searching |
D. | Automation brings speed in gene annotation process |
Answer» D. Automation brings speed in gene annotation process | |
94. |
Which of the following is incorrect about Phred? |
A. | It is a UNIX program |
B. | It doesn’t give a probability score in output |
C. | It is used for base calling |
D. | It uses a Fourier analysis to resolve fluorescence traces and predict actual peak locations of bases |
Answer» C. It is used for base calling | |
95. |
In some circumstances, one mRNA transcript can lead to the translation of more than one protein. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
96. |
Which of the following is incorrect regarding GeneQuiz? |
A. | It is a web server for protein DNA annotation |
B. | It is a web server for protein sequence annotation |
C. | It compares a query sequence against databases using BLAST and FASTA to identify homologs with high similarities |
D. | It performs domain analysis using the PROSITE and Blocks databases |
Answer» B. It is a web server for protein sequence annotation | |
97. |
Which of the following is incorrect regarding genome economy? |
A. | It is a phenomenon of synthesizing more proteins from fewer genes |
B. | This is a major strategy that eukaryotic organisms use to achieve a myriad of genotypic diversities only |
C. | This is a major strategy that eukaryotic organisms use to achieve a myriad of phenotypic diversities |
D. | There are numerous underlying genetic mechanisms to help account for genome economy |
Answer» C. This is a major strategy that eukaryotic organisms use to achieve a myriad of phenotypic diversities | |
98. |
Conserved functional sites can be identified by profile and hidden Markov model–based motif and domain search tools such as SMART and InterPro. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
99. |
The remote homology detection helps to shed light on the possible functions of the proteins that previously have no functional information at all. |
A. | True |
B. | False |
C. | May be True or False |
D. | Can't say |
Answer» B. False | |
100. |
Which of the following is incorrect regarding gene annotation? |
A. | The gene annotation of the human genome employs a combination of theoretical prediction and experimental verification |
B. | Gene structures are first predicted by ab initio exon prediction programs |
C. | The predicted genes are compared with experimentally determined cDNA and EST sequences |
D. | The pairwise alignment programs are not involved |
Answer» E. | |