Biology
Molecular Genetics
917 Questions
Molecular genetics explores the mechanisms of genetic information transfer, including DNA replication, transcription, and translation. It is a core component of biology syllabi. These concepts frequently appear in general science sections of major competitive exams.
DNA replicationTranscription processTranslation processRNA typesCentral dogma
Molecular Genetics Questions
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The presence of DNA in RER
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The presence of DNA in SER
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The presence of ribosomes in SER
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The presence of ribosomes in RER
D
Correct answer
Explanation
The key difference is that RER (Rough Endoplasmic Reticulum) has ribosomes attached to its surface, which is why it appears rough under a microscope. SER (Smooth Endoplasmic Reticulum) lacks ribosomes and has different functions like lipid synthesis. Neither contains DNA.
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RNA
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DNA
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Nucleus
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Nucleolus
A
Correct answer
Explanation
RNA, specifically messenger RNA (mRNA), carries genetic information from DNA in the nucleus to ribosomes in the cytoplasm where protein synthesis occurs. DNA remains in the nucleus, the nucleus is the organelle containing DNA, and the nucleolus produces ribosomal RNA.
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Cell membrane receptor
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Transcription factor
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DNA mismatch repair
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Cell cycle control
B
Correct answer
Explanation
The 8;14 translocation activates the myc oncogene, which is a transcription factor.
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Cytosol
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Chromosomes
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Nucleolus
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Nucleoid
C
Correct answer
Explanation
Nucleolus participates in protein synthesis by forming and storing RNA.
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Only RNA
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Both DNA and RNA
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Either DNA or RNA
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Only ssDNA
C
Correct answer
Explanation
The genetic material in viruses can be either DNA or RNA.
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single-stranded DNA
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protein
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single-stranded RNA
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double-stranded RNA
C
Correct answer
Explanation
Viroids consist of a single-strand RNA molecule and lack a protective protein coat. They were discovered in the late 1960s.
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Promoter
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Exons
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Introns
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Transposons
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The poly-A tail
C
Correct answer
Explanation
Introns are DNA bases, which are found between exons, but are not transcribed. The DNA sequence of the intron does not encode protein and is not highly conserved.
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snRNA
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miRNA
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tRNA
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rRNA
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siRNA
A
Correct answer
Explanation
Small nuclear ribonucleic acid (snRNA) is a small RNA molecules that are found within the nucleus of eukaryotic cells. snRNA (small nuclear RNA) is a component of the splicosome.
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FC region of nucleolus
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FC region or FC-DFC boundary
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DFC region
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GC-DFC boundary
B
Correct answer
Explanation
This is the correct option. Transcription of rDNA takes place either in FC region or at FC-DFC boundary.
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Transcription
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Translation
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Control of gene expression
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Replication
B
Correct answer
Explanation
Translation of proteins occurs outside the nucleus in the cytoplasm.
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DNA replication
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transcription
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RNA processing
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snRNP biogenesis
C
Correct answer
Explanation
Cajal bodies are involved in a number of roles in RNA processing like snRNA maturation and histone mRNA modification.
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tat gene
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nif genes
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rev gene
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gag gene
A
Correct answer
Explanation
This gene from human immunodeficiency virus type 1 activates viral gene expression and is essential for HIV replication.
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FASTA
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GtRNAdb
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ClustalW2
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MetaCyc
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Melanie
A
Correct answer
Explanation
Correct answer. FASTA is a DNA and protein sequence alignment software package.
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1 only
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2 only
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Both 1 and 2
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Neither 1 nor 2
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rRNA is the most abundant type of RNA in a cell.
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Anticodon occurs in mRNA.
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Okazaki fragments are formed during replication.
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Nonsense codons do not code for any amino acid.
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DNA replication is semiconservative.
B
Correct answer
Explanation
This option is correct because anticodon is a sequence of three adjacent nucleotides in transfer RNA (tRNA) that binds to a corresponding codon in messenger RNA (mRNA) and designates a specific amino acid during protein synthesis.