Cell Theory | Eukaryotic Cells | Classification and structure of prokaryotic cells | Genetics and Growth of Prokaryotic Cells | Virus and Subviral Particles |
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What are the 4 basic tenets of the cell theory
all living things are composed of cells, the cell is the basic functional unit of life, cells arise only from preexisting cells and cells carry genetic information in the form of DNA.
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What does the cytosol do
suspends the organelles and allows diffusion of molecules throughout the cell
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What are prokaryotes?
dont contain membrane-bound organelles, contain genetic material in a single circular molecule of DNA located in the nucleoid region
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what is the pattern that bacterial growth follows
lag phase, exponential (log) phase, stationary phase, death phase
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what do bacteriophages contain
tail sheath which injects the genetic material into a bacterium and tail fibers which allow the bacteriophage to attach to the host cell
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What are viruses
are not considered living things because they are acellular
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how do microtubules contribute to the structure of cilia and flagella
organized into 9 pairs of microtubules in a ring with 2 microtubules at the center (9+2 structure)
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what is gram-negative bacteria cell wall like
has a thin cell wall made of peptidoglycan and outer membrane containing phospholipids and lipopolysaccharides
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what are episomes
plasmids that can integrate into the genome
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what can single-stranded RNA viruses be
positive sense which can be translated by the host cell or negative sense which requires a complementary strand to be synthesized by RNA replicase before translation
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How does a virus reproduce
cannot reproduce without the assistance of a host cell
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How does mitochondria divide independently of the nucleus
via binary fission and can trigger apoptosis by releasing mitochondrial enzymes into the cytoplasm
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what is the moving caused by flagella in bacteria called
chemotaxis
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how can extrachromosomal material be carried
plasmids
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what does retroviruses contain
single-stranded RNA genome from which a complementary DNA strand is made using reverse transcriptase
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What does a virus use as their genetic material
RNA
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what do microfilaments form
the cleavage furrow during cytokinesis in mitosis
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what are prokaryotes 2 domains of life
archaea and bacteria
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what happens in the conjugation bridge
a plasmid can be transferred from F+ cells to F- cells or a portion of the genome can be transferred from an Hfr cell to a recipient
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how does the virus infect cells
attaches to specific receptors-> enter cell by fusing with plasma membrane-> being brought in by endocytosis or injecting
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Which 2 tenets of the cell theory does RNA violate
3rd and 4th
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what are examples of connective tissue
bone, cartilage, tendons, ligaments, adipose tissue, and blood
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prokaryotic ribosomal subunits
30S and 50S
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how do prokaryotes multiply
during binary fission by the chromosome replicating while the cell grows in size until the cell wall begins to grow inward along the midline of the cell and divides into two identical daughter cells
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how do viruses reproduce
by replicating and translating genetic material using the hosts cell ribosomes, tRNA, amino acids and enzymes
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