Microbial Genetics: DNA, RNA, and Protein
Synthesis in Microbiology Test with complete
solutions latest 2026/27 UPDATE
What is genetics?
The science of inheritance, or heredity of living things, including the transmission of traits from
parents to offspring.
Define a gene.
A segment of DNA that provides a specific function or contains the code to make a protein or
RNA molecule.
What is a genome?
The complete genetic material in a cell or organism, encompassing all its genes.
What is the role of chromosomes?
Cellular structures that contain the genetic material (DNA) and genes.
What does genotype refer to?
The genetic makeup of an organism, representing the sum of all types of genes.
What is phenotype?
The expressed characteristics or traits of an organism, determined by its genotype.
What are plasmids?
Tiny extra pieces of DNA found in bacteria and some fungi, distinct from chromosomal DNA.
What is the significance of DNA?
,DNA stores genetic information and directs the life of each organism and cell, including protein
synthesis.
What was the main finding of Frederick Griffith's experiment?
He discovered that heat-killed pathogenic bacteria could transform nonpathogenic bacteria into
pathogenic ones.
Define transformation in microbiology.
A genetic change due to the assimilation of external DNA taken up by a cell.
What did Oswald Avery and colleagues demonstrate in 1944?
They purified the transforming molecule and showed that it is DNA.
What is a bacteriophage?
A virus that infects bacteria, consisting of nucleic acid and a protein coat.
What was the purpose of the Hershey-Chase experiment?
To determine whether genes were made of protein or DNA by tracking which component entered
bacterial cells.
What are nucleotides?
The subunits of nucleic acids, composed of a phosphate group, a sugar, and a nitrogenous base.
What are the main components of DNA?
DNA is composed of nucleotides containing deoxyribose sugar, phosphate groups, and
nitrogenous bases (adenine, cytosine, guanine, thymine).
, What model of DNA did Watson and Crick propose?
The double helix model, which describes the structure of DNA.
What was the contribution of Rosalind Franklin to DNA research?
Her X-ray measurements of DNA molecules helped confirm the double helix structure proposed
by Watson and Crick.
What is the function of DNA in cells?
To store and transmit hereditary information and direct metabolic activities, including protein
synthesis.
What is the difference between DNA and RNA?
DNA contains deoxyribose sugar and thymine, while RNA contains ribose sugar and uracil.
How do nucleotides link together?
Through covalent bonds between the phosphate of one nucleotide and the sugar of the next
nucleotide.
What is genomics?
The study of an organism's entire genome.
What is the significance of the molecular weight of the transforming substance in Griffith's
experiment?
It indicated that the transforming substance must contain a large number of nucleotides, allowing
for genetic variability.
Synthesis in Microbiology Test with complete
solutions latest 2026/27 UPDATE
What is genetics?
The science of inheritance, or heredity of living things, including the transmission of traits from
parents to offspring.
Define a gene.
A segment of DNA that provides a specific function or contains the code to make a protein or
RNA molecule.
What is a genome?
The complete genetic material in a cell or organism, encompassing all its genes.
What is the role of chromosomes?
Cellular structures that contain the genetic material (DNA) and genes.
What does genotype refer to?
The genetic makeup of an organism, representing the sum of all types of genes.
What is phenotype?
The expressed characteristics or traits of an organism, determined by its genotype.
What are plasmids?
Tiny extra pieces of DNA found in bacteria and some fungi, distinct from chromosomal DNA.
What is the significance of DNA?
,DNA stores genetic information and directs the life of each organism and cell, including protein
synthesis.
What was the main finding of Frederick Griffith's experiment?
He discovered that heat-killed pathogenic bacteria could transform nonpathogenic bacteria into
pathogenic ones.
Define transformation in microbiology.
A genetic change due to the assimilation of external DNA taken up by a cell.
What did Oswald Avery and colleagues demonstrate in 1944?
They purified the transforming molecule and showed that it is DNA.
What is a bacteriophage?
A virus that infects bacteria, consisting of nucleic acid and a protein coat.
What was the purpose of the Hershey-Chase experiment?
To determine whether genes were made of protein or DNA by tracking which component entered
bacterial cells.
What are nucleotides?
The subunits of nucleic acids, composed of a phosphate group, a sugar, and a nitrogenous base.
What are the main components of DNA?
DNA is composed of nucleotides containing deoxyribose sugar, phosphate groups, and
nitrogenous bases (adenine, cytosine, guanine, thymine).
, What model of DNA did Watson and Crick propose?
The double helix model, which describes the structure of DNA.
What was the contribution of Rosalind Franklin to DNA research?
Her X-ray measurements of DNA molecules helped confirm the double helix structure proposed
by Watson and Crick.
What is the function of DNA in cells?
To store and transmit hereditary information and direct metabolic activities, including protein
synthesis.
What is the difference between DNA and RNA?
DNA contains deoxyribose sugar and thymine, while RNA contains ribose sugar and uracil.
How do nucleotides link together?
Through covalent bonds between the phosphate of one nucleotide and the sugar of the next
nucleotide.
What is genomics?
The study of an organism's entire genome.
What is the significance of the molecular weight of the transforming substance in Griffith's
experiment?
It indicated that the transforming substance must contain a large number of nucleotides, allowing
for genetic variability.
