LSU BIOL 1202 (HRINCEVICH) CH. 27 HW LATEST ACTUAL EXAM
WITH VERIFIED QUESTIONS & CORRECT ANSWERS
Question 1.
What is the function of fimbriae? a. They protect the cell from dehydration. b. They are
used in motility. c. They are used to transfer DNA during conjugation. d. They are
components of the outer cell wall in gram-negative bacteria. e. They are used to attach
the cell to its substrate or to other prokaryotes.
Correct Answer: e. They are used to attach the cell to its substrate or to other
prokaryotes.
Question 2.
What is the difference between an F+ donor and an Hfr donor? a. The Hfr donor has an F
factor integrated into its main chromosome, but the F+ donor does not. b. The Hfr donor
has an F factor, but the F+ donor does not. c. The Hfr donor has an F plasmid, but the F+
donor does not. d. The F+ donor has an F factor, but the Hfr donor does not.
Correct Answer: a. The Hfr donor has an F factor integrated into its main
chromosome, but the F+ donor does not.
Question 3.
What usually happens to the recipient cell following conjugation with an Hfr cell? a. The
recipient cell becomes an Hfr cell. b. The recipient cell remains an F+ cell. c. The recipient
cell may become either an F+ or an Hfr cell. d. The recipient cell remains an F- cell.
Correct Answer: d. The recipient cell remains an F- cell.
Question 4.
Which of the following typically produces a recombinant F+ recipient cell? a. conjugation
between two Hfr cells b. conjugation between an F+ cell and an F- cell c. conjugation
between an Hfr cell and an F- cell d. conjugation between two F- cells
Correct Answer: b. conjugation between an F+ cell and an F- cell
Question 5.
Which of the following could cause DNA from the main chromosome of a donor cell to be
incorporated into the main chromosome of the recipient cell? a. conjugation between an
Hfr cell and an F- cell b. conjugation between two F+ cells c. conjugation between two F-
cells d. conjugation between an F+ cell and an F- cell
Correct Answer: a. conjugation between an Hfr cell and an F- cell
Question 6.
Suppose conjugation occurs between an Hfr cell and an F- cell. Although not typical, what
would have to occur for the recipient cell to become an Hfr cell? a. A portion of the F
, factor would have to be incorporated into the recipient cell's chromosome. b. The entire F
factor would have to be incorporated into the recipient cell's chromosome. c. A portion of
the F plasmid would have to be transferred to the recipient cell. d. The entire F factor
would have to be transferred to the recipient cell.
Correct Answer: b. The entire F factor would have to be incorporated into the
recipient cell's chromosome.
Question 7.
The figure shows how bacteria reproduce through binary fission. Drag the terms on the
left to the appropriate blanks on the right to complete the sentences.
1. Binary fission is a form of _________ because a single
individual is the sole parent and passes copies of all its
genes to its offspring.
2. During binary fission, DNA replication begins at the
__________ and continues all the way around the circular
chromosome.
3. When DNA replication is complete and the bacteri-
um has reached twice its original size, the __________
grows inward, dividing the parent cell into two daugh-
ter cells.
4. In theory, the two daughter cells are _________ each
other and the parent cell.
5. However, mistakes made during DNA replication
sometimes result in _________ , changes to the nu-
cleotide sequence of DNA.
6. The rapid reproduction and large population sizes
of many bacterial populations mean that even a small
mutation rate can lead to considerable _________.
Correct Answer: 1. asexual reproduction 2. origin of replication 3. plasma
membrane 4. genetically identical to 5. mutations 6. genetic variation
Question 8.
Because bacteria reproduce asexually, each organism typically obtains its genetic
material from only one parent. However, bacteria do have mechanisms for bring-ing
together DNA from different individuals. One of these mechanisms is bacterial
conjugation, a process that results in the direct transfer of genetic material from one
bacterium to another. The figure shows two examples of bacterial conjugation. In these
examples, bacteria with a segment of DNA called an F factor are able to initiate
conjugation. An F factor is a piece of DNA that contains about 25 genes. Most of the genes
in the F factor are related to the production of a structure called a mating bridge. The
mating bridge links two bacterial cells during conjugation, allowing for DNA transfer. The F
factor may be found on a separate piece of DNA called an F plasmid, shown in part (a) of
the figure. Or it may be found within the main bacterial chromosome, shown in part (b) of
the figure.
Drag each phrase into the appropriate bin depending on whether it applies to an F+ cell,
WITH VERIFIED QUESTIONS & CORRECT ANSWERS
Question 1.
What is the function of fimbriae? a. They protect the cell from dehydration. b. They are
used in motility. c. They are used to transfer DNA during conjugation. d. They are
components of the outer cell wall in gram-negative bacteria. e. They are used to attach
the cell to its substrate or to other prokaryotes.
Correct Answer: e. They are used to attach the cell to its substrate or to other
prokaryotes.
Question 2.
What is the difference between an F+ donor and an Hfr donor? a. The Hfr donor has an F
factor integrated into its main chromosome, but the F+ donor does not. b. The Hfr donor
has an F factor, but the F+ donor does not. c. The Hfr donor has an F plasmid, but the F+
donor does not. d. The F+ donor has an F factor, but the Hfr donor does not.
Correct Answer: a. The Hfr donor has an F factor integrated into its main
chromosome, but the F+ donor does not.
Question 3.
What usually happens to the recipient cell following conjugation with an Hfr cell? a. The
recipient cell becomes an Hfr cell. b. The recipient cell remains an F+ cell. c. The recipient
cell may become either an F+ or an Hfr cell. d. The recipient cell remains an F- cell.
Correct Answer: d. The recipient cell remains an F- cell.
Question 4.
Which of the following typically produces a recombinant F+ recipient cell? a. conjugation
between two Hfr cells b. conjugation between an F+ cell and an F- cell c. conjugation
between an Hfr cell and an F- cell d. conjugation between two F- cells
Correct Answer: b. conjugation between an F+ cell and an F- cell
Question 5.
Which of the following could cause DNA from the main chromosome of a donor cell to be
incorporated into the main chromosome of the recipient cell? a. conjugation between an
Hfr cell and an F- cell b. conjugation between two F+ cells c. conjugation between two F-
cells d. conjugation between an F+ cell and an F- cell
Correct Answer: a. conjugation between an Hfr cell and an F- cell
Question 6.
Suppose conjugation occurs between an Hfr cell and an F- cell. Although not typical, what
would have to occur for the recipient cell to become an Hfr cell? a. A portion of the F
, factor would have to be incorporated into the recipient cell's chromosome. b. The entire F
factor would have to be incorporated into the recipient cell's chromosome. c. A portion of
the F plasmid would have to be transferred to the recipient cell. d. The entire F factor
would have to be transferred to the recipient cell.
Correct Answer: b. The entire F factor would have to be incorporated into the
recipient cell's chromosome.
Question 7.
The figure shows how bacteria reproduce through binary fission. Drag the terms on the
left to the appropriate blanks on the right to complete the sentences.
1. Binary fission is a form of _________ because a single
individual is the sole parent and passes copies of all its
genes to its offspring.
2. During binary fission, DNA replication begins at the
__________ and continues all the way around the circular
chromosome.
3. When DNA replication is complete and the bacteri-
um has reached twice its original size, the __________
grows inward, dividing the parent cell into two daugh-
ter cells.
4. In theory, the two daughter cells are _________ each
other and the parent cell.
5. However, mistakes made during DNA replication
sometimes result in _________ , changes to the nu-
cleotide sequence of DNA.
6. The rapid reproduction and large population sizes
of many bacterial populations mean that even a small
mutation rate can lead to considerable _________.
Correct Answer: 1. asexual reproduction 2. origin of replication 3. plasma
membrane 4. genetically identical to 5. mutations 6. genetic variation
Question 8.
Because bacteria reproduce asexually, each organism typically obtains its genetic
material from only one parent. However, bacteria do have mechanisms for bring-ing
together DNA from different individuals. One of these mechanisms is bacterial
conjugation, a process that results in the direct transfer of genetic material from one
bacterium to another. The figure shows two examples of bacterial conjugation. In these
examples, bacteria with a segment of DNA called an F factor are able to initiate
conjugation. An F factor is a piece of DNA that contains about 25 genes. Most of the genes
in the F factor are related to the production of a structure called a mating bridge. The
mating bridge links two bacterial cells during conjugation, allowing for DNA transfer. The F
factor may be found on a separate piece of DNA called an F plasmid, shown in part (a) of
the figure. Or it may be found within the main bacterial chromosome, shown in part (b) of
the figure.
Drag each phrase into the appropriate bin depending on whether it applies to an F+ cell,
