MICROBIOLOGY TEST BANK EXAM 3 QUESTIONS AND CORRECT ANSWERS LATEST 2026 UPDATE

MICROBIOLOGY TEST BANK EXAM
3 QUESTIONS AND CORRECT
ANSWERS LATEST 2026 UPDATE




Genomes are considered to be mosaic. Which of the following
statements provides the LEAST support for this idea?


a.
E. coli can receive plasmids from other strains of Gram-negative
bacteria.
b.
The archaeon Methanocaldococcus jannaschii has many proteins with
sequence homology to proteins found in both bacteria and Eukarya.
c.
Agrobacterium can transfer plasmids to plants.
d.

,Genome sequencing and informatics has revealed a variety of
homologous genes throughout the domains of life.
e.
Genes from Mesorhizobium loti have been found in other new species of
Mesorhizobium. - ANSWER- A. E. coli can receive plasmids from
other strains of Gram-negative bacteria.


Competence in Gram-positive organisms is induced by:
a.
calcium and cold
b.
electrical currents
c.
competence factors made of peptides
d.
presence of biofilm
e.
competence is not induced in Gram-positive bacteria - ANSWER- c.
competence factors made of peptides


The process of importing free DNA into cells is known as:
a.
transposition
d.

,generalized transduction
b.
conjugation
e.
transformation
c.
specialized transduction - ANSWER- e. transformation


Which of the following bacteria requires artificial assistance to become
competent to take up DNA?
a.
Bacillus
d.
Neisseria
b.
E. coli
e.
Streptococcus
c.
Haemophilus - ANSWER- b. E.coli


In order to transfer, an F factor must have which of the following?
a.

, oriV and its own DNA polymerase
b.
oriV and tra genes
c.
oriT and tra genes
d.
oriT and its own DNA polymerase
e.
oriT, tra genes, and its own DNA polymerase - ANSWER- oriT and
tra genes


6. F factor contains how many origins of replication?
a.
one
d.
four
b.
two
e.
none
c.
three - ANSWER- two