Prokaryotes are single-celled organisms that lack a
nucleus
The structure labeled C in figure 19-1 is
DNA
Which of the Following statements is Not true about archaebacteria?
They make up the largest Kingdom of Prokaryotes
Spherical prokaryotes are called
cocci
When treated with Gram stain, Gram-positive bacteria appear
violet
Unlike photoautotophs, chemoautotrophs obtain energy
directly from chemical reactions
Which of the following describes a role of bacteria in the enviroment?
carrying out Photosynthesis, recycling nutrients, fixing nitrogen
Humans use bacteria in all of the following ways except to
make butter and milk
what is the basic structure of a virus?
DNA or RNA surrounded by a protein coat
Bacteriophages infect
Bacteria only
Viruses that contain RNA as their genetic information are called
retroviruses
What did french chemist Louis Pasteur Help establish?
That bacteria were responsible for some diseases
what can a vaccine do when it is injected into the body?
Prompt the body to produce immunity to a disease
Which of the following diseases is NOT caused by a virus?
tetanus
Which of the following is NOT true about prions?
They are singled-stranded RNA molecules with no capsid.
The organisms labeled A in Figure 19-2 is an example of a (an)
bacillus
The knoblike root nodules of soybean plants are the sites of
nitrogen fixation
In a Lysogenic infection, the viral DNA that is Embedded in a host cell's DNA is called an
Prophage
In Figure 19-3, the structure labeled D is a(an)
Tail Fiber
The structure labeled B in Figure 19-3 is the
Tail sheath
The microorganisms called prokaryotes are
single celled organisms that lack a nucleus
Which group of Prokaryotes do scientist think may be ancestors of eukaryotes
archaebacteria
Which of the following are used to identify prokaryotes
cell shape, the way prokaryotes move, the way prokaryotes obtain energy
a method called Gram staining is used to tell
what kind of cell wall a prokaryote has
Two groups of Prokaryotes that make their own food from inorganic molecules are
photoautotrophs and chemoautotophs
binary fission occurs when a bacterium
replicates its DNA and divides in half
Bacteria that Break down the nutrients in dead matter into simpler substances that are taken up by plant roots are called
decomposers
A typical virus is composed of a
core of DNA or RNA surrounded by a protein coat
What are viruses that infect bacteria called?
Bacteriophages
Viruses that contain RNA as their genetic information are
retroviruses
Antibiotics are compounds that can
block the growth and reproduction of bacteria
Which of the following is a disease caused by a virus
strep throat
If you ash your hands properly, ordinary soaps do a good job of removing
bacteria
viruses have more difficulty entering plant cells than animal cells because
plant cells have tough cells walls.
a Prion is a virus-like particle that contains only
protein
During what , a hollow bridge forms between two bacterial cells and genes move from one cell to another.
conjugation
The process of converting nitrogen into a form plants can use is called
nitrogen fixation
A virus's protein coat is called a(an)
capsid