©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
Brock Biology of Microorganisms Chapter 6
Exam Questions With Correct Answers
1) ________ of prokaryotic genomes are now available in public databases.
A) Dozens
B) Hundreds
C) Thousands
D) Millions - answer✔C) Thousands
2) When comparing genes from Archaea, Bacteria, and Eukarya, which statement is TRUE?
A) Almost all archaeal genes are more similar to eukaryotic genes than to bacterial genes.
B) Almost all archaeal genes are more similar to bacterial genes than to eukaryotic genes.
C) Genes in Archaea involved in DNA replication, transcription, and translation are more similar
to those of Eukarya, while those encoding metabolic functions other than information processing
are more similar to those of Bacteria.
D) Archaeal genes are almost universally unique; very few are similar to either eukaryotic or
bacterial genes. - answer✔C) Genes in Archaea involved in DNA replication, transcription, and
translation are more similar to those of Eukarya, while those encoding metabolic functions other
than information processing are more similar to those of Bacteria.
3) Based on the table of average intron frequency given below, predict the relative order of
genome size for these four eukaryotic organisms.
Organism Average Intron Frequency
Cryptosporidium parvum 0
Plasmodium falciparum 1
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
Arabidopsis thaliana 5
Homo sapiens 8
A) Homo sapiens > Arabidopsis thaliana > Plasmodium falciparum > Cryptosporidium parvum
B) Cryptosporidium parvum > Plasmodium falciparum > Arabidopsis thaliana > Homo sapiens
C) Homo sapiens > Cryptosporidium parvum > Plasmodium falciparum > Arabidopsis thaliana
D) Intron frequency cannot be used to predict genome size in eukaryotes. - answer✔A) Homo
sapiens > Arabidopsis thaliana > Plasmodium falciparum > Cryptosporidium parvum
4) The 140 kbp genome containing many short repeats, ribosomal RNA genes, one RNA
polymerase gene (rpo) and one RubisCO gene (rbcL) is most likely from a(n)
A) plant.
B) autotrophic bacterium.
C) chloroplast.
D) autotrophic archaeon. - answer✔C) chloroplast.
5) The evolutionary origin of mitochondria is demonstrated by which of the following key
genomic characteristics?
A) variable numbers of protein-encoding genes
B) large stretches of AT-rich DNA
C) linear and circular genome structure in different organisms
D) rRNA genes most closely related to Bacteria - answer✔D) rRNA genes most closely related
to Bacteria
6) An open reading frame (ORF) encodes for
A) a carbohydrate.
B) a polypeptide.
C) mRNA.
D) a carbohydrate or a polypeptide. - answer✔B) a polypeptide.
7) The pan genome of a species is the genomic content that is
10/3/2024 9:54 PM
Brock Biology of Microorganisms Chapter 6
Exam Questions With Correct Answers
1) ________ of prokaryotic genomes are now available in public databases.
A) Dozens
B) Hundreds
C) Thousands
D) Millions - answer✔C) Thousands
2) When comparing genes from Archaea, Bacteria, and Eukarya, which statement is TRUE?
A) Almost all archaeal genes are more similar to eukaryotic genes than to bacterial genes.
B) Almost all archaeal genes are more similar to bacterial genes than to eukaryotic genes.
C) Genes in Archaea involved in DNA replication, transcription, and translation are more similar
to those of Eukarya, while those encoding metabolic functions other than information processing
are more similar to those of Bacteria.
D) Archaeal genes are almost universally unique; very few are similar to either eukaryotic or
bacterial genes. - answer✔C) Genes in Archaea involved in DNA replication, transcription, and
translation are more similar to those of Eukarya, while those encoding metabolic functions other
than information processing are more similar to those of Bacteria.
3) Based on the table of average intron frequency given below, predict the relative order of
genome size for these four eukaryotic organisms.
Organism Average Intron Frequency
Cryptosporidium parvum 0
Plasmodium falciparum 1
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
Arabidopsis thaliana 5
Homo sapiens 8
A) Homo sapiens > Arabidopsis thaliana > Plasmodium falciparum > Cryptosporidium parvum
B) Cryptosporidium parvum > Plasmodium falciparum > Arabidopsis thaliana > Homo sapiens
C) Homo sapiens > Cryptosporidium parvum > Plasmodium falciparum > Arabidopsis thaliana
D) Intron frequency cannot be used to predict genome size in eukaryotes. - answer✔A) Homo
sapiens > Arabidopsis thaliana > Plasmodium falciparum > Cryptosporidium parvum
4) The 140 kbp genome containing many short repeats, ribosomal RNA genes, one RNA
polymerase gene (rpo) and one RubisCO gene (rbcL) is most likely from a(n)
A) plant.
B) autotrophic bacterium.
C) chloroplast.
D) autotrophic archaeon. - answer✔C) chloroplast.
5) The evolutionary origin of mitochondria is demonstrated by which of the following key
genomic characteristics?
A) variable numbers of protein-encoding genes
B) large stretches of AT-rich DNA
C) linear and circular genome structure in different organisms
D) rRNA genes most closely related to Bacteria - answer✔D) rRNA genes most closely related
to Bacteria
6) An open reading frame (ORF) encodes for
A) a carbohydrate.
B) a polypeptide.
C) mRNA.
D) a carbohydrate or a polypeptide. - answer✔B) a polypeptide.
7) The pan genome of a species is the genomic content that is
