Microbial Genetics and Gene Expression in
Microbiology Test with complete solutions latest
2026/27 UPDATE
What are the two main types of nucleic acids?
Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA)
What is the primary function of DNA?
To store information needed to build and control the cell and to pass genetic material from parent
to offspring.
What is the primary function of RNA?
To assist in protein synthesis (translation) and its regulation.
What is a genome?
The entire collection of genetic material in a cell or virus.
What are the structural components of a nucleotide?
Phosphate, sugar, and nitrogen base.
How do DNA and RNA differ in terms of structure?
DNA is typically double-stranded, while RNA is usually single-stranded.
What is the significance of the central dogma in genetics?
It describes the flow of genetic information from DNA to RNA to protein.
Define genotype.
,The full collection of genes; the heritable instructional code.
Define phenotype.
The observable characteristics or traits of an organism, influenced by genotype.
What is the role of mRNA?
To serve as a temporary transcript of genetic instructions used as a template to make proteins.
What is the function of tRNA?
To deliver amino acids to the ribosome and match them to the mRNA code.
What is the role of rRNA?
To form the major structural part of ribosomes and facilitate protein synthesis.
What happens during DNA denaturation?
Exposure to high heat or chemicals breaks bonds between bases, separating double-stranded
DNA into single strands.
What is a mutation?
A change in the DNA sequence that can lead to variations in gene expression and function.
What is the relationship between transcription and translation?
Transcription is the process of copying DNA into RNA, while translation is the process of
converting RNA into a protein.
How do prokaryotic and eukaryotic cells differ in genome organization?
, Prokaryotic genomes are typically single, circular, and located in the nucleoid, while eukaryotic
genomes are multiple, linear, and contained within a nucleus.
What is the significance of the phrase 'What is true in E. coli is true in the elephant'?
It highlights the universality of genetic principles across different forms of life.
What are plasmids?
Small, circular DNA molecules found in prokaryotes that can replicate independently of
chromosomal DNA.
What is the role of regulatory RNAs?
To control gene expression and respond to cellular signals.
What are the base pairing rules for DNA?
A pairs with T, and C pairs with G.
What are the base pairing rules for RNA?
A pairs with U, and C pairs with G.
What is the importance of GC content in DNA?
GC content affects the stability of DNA; higher GC content generally increases stability.
What is the function of the ribosome?
To facilitate the translation of mRNA into a protein.
What is the process of gene expression?
Microbiology Test with complete solutions latest
2026/27 UPDATE
What are the two main types of nucleic acids?
Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA)
What is the primary function of DNA?
To store information needed to build and control the cell and to pass genetic material from parent
to offspring.
What is the primary function of RNA?
To assist in protein synthesis (translation) and its regulation.
What is a genome?
The entire collection of genetic material in a cell or virus.
What are the structural components of a nucleotide?
Phosphate, sugar, and nitrogen base.
How do DNA and RNA differ in terms of structure?
DNA is typically double-stranded, while RNA is usually single-stranded.
What is the significance of the central dogma in genetics?
It describes the flow of genetic information from DNA to RNA to protein.
Define genotype.
,The full collection of genes; the heritable instructional code.
Define phenotype.
The observable characteristics or traits of an organism, influenced by genotype.
What is the role of mRNA?
To serve as a temporary transcript of genetic instructions used as a template to make proteins.
What is the function of tRNA?
To deliver amino acids to the ribosome and match them to the mRNA code.
What is the role of rRNA?
To form the major structural part of ribosomes and facilitate protein synthesis.
What happens during DNA denaturation?
Exposure to high heat or chemicals breaks bonds between bases, separating double-stranded
DNA into single strands.
What is a mutation?
A change in the DNA sequence that can lead to variations in gene expression and function.
What is the relationship between transcription and translation?
Transcription is the process of copying DNA into RNA, while translation is the process of
converting RNA into a protein.
How do prokaryotic and eukaryotic cells differ in genome organization?
, Prokaryotic genomes are typically single, circular, and located in the nucleoid, while eukaryotic
genomes are multiple, linear, and contained within a nucleus.
What is the significance of the phrase 'What is true in E. coli is true in the elephant'?
It highlights the universality of genetic principles across different forms of life.
What are plasmids?
Small, circular DNA molecules found in prokaryotes that can replicate independently of
chromosomal DNA.
What is the role of regulatory RNAs?
To control gene expression and respond to cellular signals.
What are the base pairing rules for DNA?
A pairs with T, and C pairs with G.
What are the base pairing rules for RNA?
A pairs with U, and C pairs with G.
What is the importance of GC content in DNA?
GC content affects the stability of DNA; higher GC content generally increases stability.
What is the function of the ribosome?
To facilitate the translation of mRNA into a protein.
What is the process of gene expression?
