Microbial Genetics: DNA, Gene Expression,
Mutations, and Recombination Exam Questions
and Correct Answers
What is genetics?
The science of heredity, studying the structure of genes, how they are passed to offspring, and
how they are expressed.
What are chromosomes?
Cellular structures that physically contain hereditary information in the form of genes; a single
molecule of DNA.
Define a gene.
Segments of DNA that code for a single polypeptide, with some coding for ribosomal RNA or
transfer RNA.
What is the genetic code?
The sequence of bases that code for the amino acids in a polypeptide.
What is the difference between genotype and phenotype?
Genotype is the genetic makeup of the organism, while phenotype is the actual expressed
properties of the organism.
How does DNA serve as genetic information?
DNA is composed of nucleotides, forming a double helix structure that carries hereditary
information through base sequences.
, What are the components of a nucleotide?
A sugar (pentose), a phosphate, and one of four nitrogenous bases (adenine, thymine, cytosine,
guanine).
What is transcription?
The process of copying DNA into RNA, specifically mRNA, which carries genetic information
to ribosomes for protein synthesis.
What is translation?
The process of synthesizing a polypeptide chain from the information in mRNA at the
ribosomes.
What is DNA replication?
The process of copying DNA to produce two identical daughter DNA molecules from one
parental DNA molecule.
What is semiconservative replication?
A feature of DNA replication where each daughter molecule contains one original strand and one
newly synthesized strand.
What role does DNA polymerase play in DNA replication?
It synthesizes new DNA strands and acts as a proofreader to ensure correct base pairing.
What initiates the process of DNA replication in bacteria?
Replication begins at a unique site called the origin of replication.
Mutations, and Recombination Exam Questions
and Correct Answers
What is genetics?
The science of heredity, studying the structure of genes, how they are passed to offspring, and
how they are expressed.
What are chromosomes?
Cellular structures that physically contain hereditary information in the form of genes; a single
molecule of DNA.
Define a gene.
Segments of DNA that code for a single polypeptide, with some coding for ribosomal RNA or
transfer RNA.
What is the genetic code?
The sequence of bases that code for the amino acids in a polypeptide.
What is the difference between genotype and phenotype?
Genotype is the genetic makeup of the organism, while phenotype is the actual expressed
properties of the organism.
How does DNA serve as genetic information?
DNA is composed of nucleotides, forming a double helix structure that carries hereditary
information through base sequences.
, What are the components of a nucleotide?
A sugar (pentose), a phosphate, and one of four nitrogenous bases (adenine, thymine, cytosine,
guanine).
What is transcription?
The process of copying DNA into RNA, specifically mRNA, which carries genetic information
to ribosomes for protein synthesis.
What is translation?
The process of synthesizing a polypeptide chain from the information in mRNA at the
ribosomes.
What is DNA replication?
The process of copying DNA to produce two identical daughter DNA molecules from one
parental DNA molecule.
What is semiconservative replication?
A feature of DNA replication where each daughter molecule contains one original strand and one
newly synthesized strand.
What role does DNA polymerase play in DNA replication?
It synthesizes new DNA strands and acts as a proofreader to ensure correct base pairing.
What initiates the process of DNA replication in bacteria?
Replication begins at a unique site called the origin of replication.
