32 terms

Biology: Quiz 9

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Conjugation is a process in which:
a bacterium transfers a copy of some or all of its DNA to another bacterium
The Plasmodium parasite is transmitted by:
mosquitoes
What biologists once considered to be the Kingdom Protista is now known to not be monophyletic. Which of the following statements is both true and consistent with this fact?
Different primitive eukaryotic ancestors gave rise to different lineages of protists.
Small circular DNA molecules capable of self-replication are called:
plasmids
How did mitochondria originate in protists?
They derived from bacterial cells that were taken in and later specialized
Most archaean species:
have yet to be discovered
Prokaryotes are classified into ______ domain(s).
2
Protists that spread without any individual cells moving, but rather by adding new cells at the edge of the colony are called:
slime molds
Spherical bacteria are known as:
cocci
Protists are alike in that all are:
eukaryotic
Prokaryotes reproduce by ___________, which creates _____ exact daughter cell clones of the original parent cell.
binary fission; two
Is it important to take all of the antibiotic prescribed to you by your physician even after symptoms clear up?
Yes, even after your symptoms clear up there are still harmful bacteria in your system that are the most resistant to the antibiotic. It is important to reduce their population size and expose them to competition from other types of bacteria.
Which of the following statements about the archaeal genome is correct?
The archaeal genome is primarily composed of genes that cannot be found in either of the other domains of life.
A Paramecium feeds by the process of:
phagocytosis
The oldest known eukaryotes were:
acritarchs
Individuals that have a resistance to the malarial Plasmodium carry an allele designated:
Hb^s
The same genetic condition that causes sickle-cell anemia can also protect against:
malaria.
Archaea and bacteria diverged:
before archaea and eukarya diverged
The malarial Plasmodium is difficult for the human immune system to fight off because:
as the Plasmodium moves through its series of distinct developmental stages, it produces different cell surface proteins.
Brown algae are:
eukaryotic and photosynthetic
In evolutionary time, the nuclear membrane was probably first formed by:
the fusion of folds of the plasma membrane that surrounded the cell.
The three most fundamental groups of organisms on the planet are:
bacteria, archaea, and eukarya
Antibiotics have no effect on:
viruses
All living organisms have evolved from a single common ancestor. The existence of which molecule lends the greatest support to this statement?
ribosomal RNA
The basic structure of a virus consists of:
Genetic information in the form of DNA or RNA enclosed within a protein coat
The first eukaryotes were:
protists
Prokaryotic cells may contain all of the following EXCEPT:
a membrane bound nucleus
A bacterium is gram-positive only if:
it has a layer of peptidoglycan on the outside of the cell membrane
Gram-positive bacteria are colored purple by the gram-stain because:
they have a layer of gylcoprotein called peptidoglycan outside of the cell membrane
Members of the Archaea have been observed most commonly:
in very extreme (with respect to temperature, salinity, pressure, etc.) environments.
All of the living organisms that we can see with the naked eye are:
in the domain Eukarya
Which of the following does a bacterium NOT contain?
mitochondria