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POB Exam 4 Study Questions 2024
POB Exam 4 Study Questions 2024
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POB Exam 4 Study QuestionsMicrobiology is the study of microbes. These include all but which of the
following?
A. Archaea
B. Bacteria
✅✅-D. plants
C. viruses
D. plants -
What general feature is necessary to consider an organism a microbe?
A. small enough that a microscope is required to see them
B. heterotrophic
✅✅
C. sexual reproduction
D. use aerobic respiration for metabolism - -A. small enough that a
microscope is required to see them
Miller's laboratory experiments showed that
A. it is possible to form protocells.
B. the primitive gases can react together to produce small organic molecules.
✅✅
C. atmospheric pressure is required for life to begin.
D. the earth is approximately 4.5 billion years old. - -B. the primitive
gases can react together to produce small organic molecules.
Which of the following kinds of molecules is thought to have been absent from
the primitive reducing atmosphere?
A. water vapor (H2O)
B. methane (CH4)
✅✅
C. hydrogen (H2)
D. oxygen (O2) - -D. oxygen (O2)
Considering the various theories, the energy used in forming organic
molecules in the primitive atmosphere could have come from all EXCEPT
A. lightning.
B. ultraviolet radiation.
C. heat from volcanoes.
,D. sound. - ✅✅-D. sound.
What is the evolutionary relationship among archaea, bacteria, and eukarya?
A. Since archaea are the most primitive, archaean ancestors gave rise to
bacteria that in turn gave rise to eukaryotes.
B. All three domains are equally distant from the most primitive common
ancestor, a protocell.
C. Archaea and eukarya share nucleic acid similarities, so eukarya split off
from archaea.
✅✅
D. Bacterial ancestors gave rise to both archaea and to eukaryotes as two
separate side branches. - -C. Archaea and eukarya share nucleic acid
similarities, so eukarya split off from archaea.
A new classification by domains separates prokaryotes into
A. Bacteria and Cyanobacteria.
B. photosynthetic bacteria and chemosynthetic bacteria.
✅✅
C. Archaea and Bacteria.
D. autotrophs and heterotrophs. - -C. Archaea and Bacteria.
One bacterial cell passes DNA to a second cell through a sex pilus in the
process of
A. transformation.
B. transduction.
✅✅-C. conjugation.
C. conjugation.
D. replication. -
Bacterial cells pick up free pieces of DNA from the medium pieces that were
released from dead bacteria in a process called
A. transformation.
B. transduction.
✅✅-A. transformation.
C. conjugation.
D. replication. -
Which of these is a correct description of a form of horizontal gene transfer in
bacteria?
, A. Crossing-over occurs between paired chromosomes in meiosis.
B. Conjugation occurs when a cell passes DNA to another cell by means of a
sex pilus.
C. Transformation occurs when a bacteriophage carries a bit of DNA from a
previous host cell to a new host cell.
✅✅
D. Transduction occurs when a live bacterium picks up DNA from dead
bacteria that have shed it into the environment of the living cell. - -B.
Conjugation occurs when a cell passes DNA to another cell by means of a sex
pilus.
Which type of genetic exchange occurs among bacteria in which DNA is
carried into a bacterial cell by means of a virus?
A. conjugation
B. transformation
✅✅
C. transduction
D. budding - -C. transduction
Which statement is true about bacteria?
A. They contain a nucleus.
B. They lack ribosomes.
C. They usually lack a cell wall.
✅✅
D. They contain a single, circular DNA molecule as the genetic material. -
-D. They contain a single, circular DNA molecule as the genetic material.
Which statement is NOT true about bacteria?
A. They lack mitochondria.
B. They lack a nucleus but contain DNA.
✅✅-C. They reproduce
C. They reproduce sexually.
D. They have a single circular chromosome. -
sexually.
The capsid of a virus is composed of
A. RNA.
B. protein.
C. DNA.
D. cellulose.
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