Q2

Question 1

A bacterium containing ________ provided with hydrogen peroxide will produce oxygen bubbles.
A bacterium containing ________ provided with hydrogen peroxide will produce oxygen bubbles.
superoxide dismutase
peroxidase
catalase
superoxide reductase

Answer 1

Catalase

Question 2

In a batch culture, bacterial cultures typically exhibit four different phases of growth. In which phase are the cells rapidly synthesizing proteins, but cell numbers are not changing?
In a batch culture, bacterial cultures typically exhibit four different phases of growth. In which phase are the cells rapidly synthesizing proteins, but cell numbers are not changing?
exponential phase
stationary phase
death phase
lag phase

Answer 2

lag phase

Question 3

Taq polymerase was isolated from a thermophile and is used in the polymerase chain reaction (PCR) technique because it does not become inactivated at high temperatures.
Taq polymerase was isolated from a thermophile and is used in the polymerase chain reaction (PCR) technique because it does not become inactivated at high temperatures.
True
False

Answer 3

T

Question 4

A microbe growing in a refrigerator is likely
A microbe growing in a refrigerator is likely
psychrotolerant or psychrophilic.
mesophilic.
hyperthermophilic.
psychrophilic.

Answer 4

psychrotolerant or psychrophilic.

Question 5

In principle, the chemical composition of membranes in obligate acidophiles could be distinguished from neutrophiles.
In principle, the chemical composition of membranes in obligate acidophiles could be distinguished from neutrophiles.
True
False

Answer 5

T

Question 6

Direct microscope counting of stained cells is an accurate method for calculating the exact number of cells in a sample.
Direct microscope counting of stained cells is an accurate method for calculating the exact number of cells in a sample.
True
False

Answer 6

T

Question 7

The number of colonies obtained in a plate count does NOT depend on the
The number of colonies obtained in a plate count does NOT depend on the
type of culture medium.
size of the colonies.
incubation time.
inoculum volume.

Answer 7

size of colonies

Question 8

Systematic analysis now commonly includes ________ to identify, characterize, and determine relationships between new strains of bacterial species.
Systematic analysis now commonly includes ________ to identify, characterize, and determine relationships between new strains of bacterial species.
pigments
whole genome analysis
staining
microscopy

Answer 8

whole genome analysis

Question 9

Most mesophilic organisms can grow in a temperature range of
Most mesophilic organisms can grow in a temperature range of
20-40°C.
10-20°C.
50-65°C.
0-15°C.

Answer 9

20-40

Question 10

The rates of exponential growth (in the exponential phase) vary greatly according to the bacterial species as well as the bioavailable nutrients.
The rates of exponential growth (in the exponential phase) vary greatly according to the bacterial species as well as the bioavailable nutrients.
True
False

Answer 10

T

Question 11

Superoxide dismutase and catalase work together to convert superoxide into
Superoxide dismutase and catalase work together to convert superoxide into
ozone.
peroxide.
carbon dioxide.
oxygen.

Answer 11

Oxygen

Question 12

Which of the following statements is FALSE concerning the universal tree of life?
Which of the following statements is FALSE concerning the universal tree of life?
The current universal tree of life is based on molecular sequences and completely changes our view of evolutionary relationships between eukaryotic species.
The current universal tree of life is supported by multiple genes including SSU rRNA sequences.
The current universal tree of life depicts three domains of life, two of which are prokaryotic.
Previous versions of the universal tree of life were based largely on fossils and comparative biology, which overlooked the diversity of and relationships between most prokaryotes.

Answer 12

The current universal tree of life is based on molecular sequences and completely changes our view of evolutionary relationships between eukaryotic species.

Question 13

The activity of MinC and MinD direct whether a bacterial cell will be coccoid or bacillus shaped.
The activity of MinC and MinD direct whether a bacterial cell will be coccoid or bacillus shaped.
True
False

Answer 13

F

Question 14

The time between inoculation and the beginning of growth is usually called the
The time between inoculation and the beginning of growth is usually called the
death phase.
lag phase.
log phase.
dormant phase.

Answer 14

lag phase.

Question 15

Some microbes can grow in boiling water.
Some microbes can grow in boiling water.
True
False

Answer 15

T

Question 16

Counting chambers are used for estimating the number of cells present in a liquid culture from a sample.
Counting chambers are used for estimating the number of cells present in a liquid culture from a sample.
True
False

Answer 16

T

Question 17

Fts proteins are essential for bacterial cell division because they __________.
Fts proteins are essential for bacterial cell division because they __________.
are responsible for forming the divisome
are responsible for peptidoglycan synthesis
are responsible for pulling apart the two copies of the chromosome
All of the listed responses are correct.

Answer 17

Fts (filamentous temperature sensitive) protein is essential for all cell division. They interact to form the divisome complex. The goal of the complex is to form a FtsZ ring at the center of the cell to pinch off the cell for division. This ring attracts other proteins - FstA and ZipA. FtsA recruits FtsZ proteins and ZipA anchors the ring to the cytoplasmic membrane and stabilizes it.

ALL LISTED

Question 18

The primary domains were founded based on comparative ribosomal RNA gene sequencing.
The primary domains were founded based on comparative ribosomal RNA gene sequencing.
True
False

Answer 18

T