The usual method of reproduction in bacteria is
a. sexually by conjugation
b. asexually by conjugation
c. sexually by binary fission
d. asexually by binary fission
e. asexually by budding
d. (asexually by binary fission)
If an organism existed that needed both light and pre-formed organic compounds to survive, it would be considered a
e. none of the above
Which of the following statements concerning viruses is false?
a. They contain nucleic acid.
b. They are smaller than bacteria.
c. They need living cells to reproduce.
d. They do not have cell structures.
e. They metabolize food for energy
e. (They metabolize food for energy) (don't eat, just reproduce themselves using the cell they're in).
Which of the following is not a characteristic of the kingdom Protista?
a. members can be photosynthetic
b. members can be free-living
c. some members move via flagella
d. some members are shaped like rods and termed bacilli
e. some members spend part of their lifecycle inside insects
d. (some members are shaped like rods and termed bacilli) (bacteria, not protists)
Which of the following is not a characteristic of fungus-like protists, such as slime molds?
b. lack cell walls of chitin
c. seemingly multicellular
d. (Photosynthetic) (decomposers)
Which statement is true of the organisms in Kingdom Fungi?
a. Most are unicellular.
b. All have vascular tissue.
c. Most are decomposers.
d. Most are highly poisonous.
e. All are autotrophic
c. (Most are decomposers)
Which of the following is a club fungus?
c. bread mold
Which of these is autotrophic?
a. an amoeba
b. an algae
c. a ciliate
d. a fungus
e. more than one of the above
b. (an algae) (plant-like protists that can do photosynthis)
Compare and contrast the lytic and lysogenic cycles of viral infection.
(Lytic: virus enters cell, takes over the cell machinery to make bunches of copies of itself (replicates), bunch of newly formed viruses in host cell, to get out host cell burst through cell membrane (burst), new virus particles infect other cells)
(Lyosogenic: virus enters host cell, inserts its DNA into host cell DNA, every time host DNA replicates it replicates virus DNA, doesn't kill host cell) (slow reproduction of virus)
Define lytic infection, and summarize the steps of this type of infection.
In a lytic infection, a virus enters a cell, makes copies of itself, and causes the cell to burst.
1. Bacteriophage injects DNA into bacterium.
2. Bacteriophage DNA forms a circle.
3. Bacteriophage takes over bacterium's metabolism, causing synthesis of new bacteriophage proteins and nucleic acids.
4. Bacteriophage proteins and nucleic acids assemble into complete bacteriophage particles.
5. Bacteriophage enzyme lyses the bacterium's cell wall, releasing new bacteriophage particles that can attack other cells.
Define lysogenic infection.
In a lysogenic infection, a virus integrates its DNA into the DNA from the host cell, and the viral genetic information replicates along with the host cell's DNA. Unlike lytic viruses, lysogenic viruses do not lyse the host right away. Instead, a lysogenic virus remains inactive for a period of time.
1. Bacteriophage injects DNA into bacterium.
2. Bacteriophage DNA forms a circle.
3. Bacteriophage DNA inserts itself into bacterial chromosome
4. Bacteriophage DNA (prophage: the viral DNA that is embedded in the host's DNA) may replicate with bacterium for many generations
5. Bacteriophage DNA (prophage) can exit the bacterial chromosome. Bacteriophage enters lytic cycle.
a. Bacteriophage takes over bacterium's metabolism, causing synthesis of new bacteriophage proteins and nucleic acids.
b. Bacteriophage proteins and nucleic acids assemble into complete bacteriophage particles.
c. Bacteriophage enzyme lyses the bacterium's cell wall, releasing new bacteriophage particles that can attack other cells.
EUGLENAS have cell walls composed of silica and shaped like the two sides of a pillbox
Prokaryote that is phtosynthetic but also needs organic compounds for nutrition (474)
Heterotrophic prokaryotes that must take in organic molecules for both energy and a supply of carbon (most animals, including humans) (473)
Prokaryote that obtains energy directly from inorganic molecules using chemical reactions (474)
Prokaryote that carries out photosynthesis in a manner similar to that of plants (474)
Like all organisms, bacteria need a constant supply of energy. This energy is released by the process of cellular respiration or fermentation or both. Organisms that require a constant supply of oxygen in order to live are called obligate aerobes.
(Obligate means that organisms are obligated, or required, by their life processes to live only in a particular way)
Some bacteria, however, do not require oxygen and, in fact, maybe killed by it! These bacteria are called obligate anaerobes, and they must live in the absence of oxygen.
A third group of bacteria can survive with or without oxygen and are known as facultative anaerobes.
(Facultative means that the organisms are able to function in different ways, depending on their environment)
Facultative anaerobes do not require oxygen, but neither are they killed by its presence. Their ability to switch between the processes of cellular respiration and fermentation means that facultative anaerobes are able to live just about anywhere
Type of asexual reproduction in which a prokaryote replicates its DNA, and divides in half, producing two identical daughter cells (476)
Form of sexual rperoduction in which paramecia and some prokaryotes exchange genetic information (476)
Type of spore formed when a bacterium produces a thick internal wall that encloses its DNA and a protion of its cytoplasm (476)
Process in which a virus enters a cell, makes a copy of itself, and causes the cell to burst (485)
Process by which a virus embeds its DNA into the DNA of the host cell and is replicated along with the host cell's DNA (485)
Particles of nucleic acid, protein, and in some cases, lipids.
Can only reproduce by infecting living cells.
Typically composed of a core of DNA or RNA surrounded by a protein coat.
Parasites (dependent entirely upon another living organism for its existence)
Borderline of living and nonliving things
Virus that contains RNA as its genetic information (487)
Backwards ("retro" means backwards); genetic information is copied from RNA to DNA
Causes cancers, AIDS
Single-stranded RNA molecules that have no surrounding capsids (490)
Cause disease in plants
Enter infected cell and direct the synthesis of new viroids
Infectious particle made up of protein rather than RNA or DNA (487)
Cause disease in animals
"Protein infectious particles"
Form protein clumps that induce normal protein molecules to become prions
Zooflagellates swim with flagella, sarcodines move by extensions of their cytoplasm (pseudopods), ciliates move by means of cilia, and sporozoans do not move on their own at all (parasitic) (499)
Projection of cytoplasm, or false foot, used by some protists (sacodines) for feeding or movement (498)
Type of locomotion used by amoebas (sarcodines)
The cytoplasm of the cell streams into the pseudopod, and the rest of the cell follows (498)
The larger of the ciliate's two nuclei, contains multiple copies of most of the genes that the cell needs in its day-to-day existance (499)
The smaller of a ciliare's two nuclei; contains a "reserve copy" of all the cell's genes (499)
Cavity in the cytoplasm of some protsists (paramecium, ciliates) that collects water and discharges it from the cell; homeostasis (500)
Chlorophyll and accesory pigments allow algae to harvest and use the energy from sunlight
Four phyla: euglenophytes (two flagella but no cell wall), chrysophytes (golden plants), diatoms (cell walls rich in silicon), and dinoflagellates (half photosynthetic half heterotrophs) (508)
Cluster of reddish pigment near the gullet end of the cell that helps the organism find sunlight to power photosynthesis (euglenophytes) (506)
Population of algae (plantlike protists) and other small, photosynthetic organisms found near the surface of the ocean and forming part of plankton; perform about half of the photosynthesis that occur on Earth (508)
Haploid reproductive cell
When male and female gametes fuse, they produce a diploid zygote cell, which then grows nto a large, diploid multicellular Ulva. The diploid Ulva undergoes meiosis to produce haploid reproductive cells called ___. Each of these is able to grow into a new individual without fusing with another cell. (514)
Like fungi, the funuslike protists are heterotrophs that absorb nutrients from dead or decaying organic matter. But unlike most true fungi, funguslike protists have centrioles. They also lack the chitin cell walls of true fungi (cellular slime molds, acellular slime molds, and water molds) (516)
Slender reproductive structure that produces spores (cellular slime molds, funguslike protists); reproductive structure growing from the mycelium in the soil beneath it (mushroom is fruiting body of fungus) (528)
Eukaryotic heterotrophs that have cell walls, all muticellular (except yeast) (absorb nutrients from decaying matter in soil, parasites that absorb nutrients from host); four main groups: common molds, sac (includes yeast), club (spore-bearing reproductive structure basidium), and imperfect; maintain equilibrium in ecosystems by recycling nutrients by breaking down the bodies and wastes of other organisms
Many hyphae tangled together into a thick mass; comprises the bodies of multiceullar fungi; absorb food(528)
Structures where spores are produced in some fungi; found at tip o specialized hyphae called sporangiophores (528)
Process of attaching a bud to a plant to produce a new branch; asexual reproduction of yeasts (fungi) (533, 623)