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Examen

BCOR Exam 2 with precise detailed solutions

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BCOR Exam 2 with precise detailed solutions

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BCOR Exam 2 with precise detailed solutions ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Peptidoglycan - correct answer✔✔A polymer composed of modified sugars cross-linked by ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




short polypeptides. This molecular fabric encloses the entire bacterium and anchors other
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




molecules that extend from its surface. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Gram Stain - correct answer✔✔Developed by Hans Christian. Used to classify bacterial
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




species into two groups based on differences in the cell wall composition.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Gram-Positive - correct answer✔✔Bacteria have simpler walls with a relatively large amount ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




of peptidoglycan.
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*have a thick peptidoglycan layer
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*appear purple after gram staining ||\\//|| ||\\//|| ||\\//|| ||\\//||




*alcohol rinse does not remove crystal violet ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




*have a plasma membrane ||\\//|| ||\\//|| ||\\//||




Gram-Negative - correct answer✔✔Bacteria have less peptidoglycan and are structurally ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




more complex, with an outer membrane that contains lipopolysaccharides (carbohydrates
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




bonded to lipids). ||\\//|| ||\\//||




*have a thin peptidoglycan layer
||\\//|| ||\\//|| ||\\//|| ||\\//||




*have an outer membrane as part of their cell wall structure
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




*alcohol rinse easily removes crystal violet ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




*appear pink after Gram staining ||\\//|| ||\\//|| ||\\//|| ||\\//||




*have a plasma membrane ||\\//|| ||\\//|| ||\\//||

,Transduction - correct answer✔✔Phages (from bacteriophages, the viruses that infect ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




bacteria) carry prokaryotic genes from one host cell to another. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




*contributes to genetic recombination in prokaryotes ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Gametophyte - correct answer✔✔Multicellular haploid ("gamete-producing plant") is named ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




for its production by mitosis of haploid gametes, eggs and sperm, that fuse during
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




fertilization, forming diploid zygotes. ||\\//|| ||\\//|| ||\\//||




Sporophyte - correct answer✔✔Mitotic division of the zygote produces a multicellular diploid ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




("spore-producing plant.")
||\\//|| ||\\//||




Gametangia - correct answer✔✔Production of gametes within multicellular organs. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Archegonia - correct answer✔✔Female gametangia. ||\\//|| ||\\//|| ||\\//|| ||\\//||




Antheridia - correct answer✔✔Male gametangia. ||\\//|| ||\\//|| ||\\//|| ||\\//||




Apical Meristems - correct answer✔✔Growth in length is sustained throughout the plant's
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




life by the activity of apical meristems, localized regions of cell division at the tips of the
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




roots and shoots. ||\\//|| ||\\//||




Xylem - correct answer✔✔Conducts most of the water and minerals.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Lignin - correct answer✔✔The water conducting cells in vascular plants are lignified, that is,
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




their cell walls are strengthened by the polymer lignin.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Phloem - correct answer✔✔The tissue called phloem has cells arranged into tubes that
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




distribute sugars, amino acids, and other organic products. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||

,What is the endosymbiotic theory for how eukaryotes evolved (look back at Chapter 25;
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




page 517)? - correct answer✔✔Evidence supports that mitochondria and plastids (a general
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




term for chloroplasts and related organelles) were formerly small prokaryotes that began
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




living within larger cells.
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What type of bacteria was likely engulfed that, ultimately, led to plastid-bearing eukaryotes
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




(see page 577)? - correct answer✔✔gram-negative cyanobacterium was engulfed by an
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




ancestral heterotrophic eukaryote. ||\\//|| ||\\//||




Heterochrony - correct answer✔✔evolutionary change in the rate of timing of events can ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




lead to speciation.
||\\//|| ||\\//||




Hox Gene - correct answer✔✔control development along axis of body (organism).
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




*highly conserved (little change) ||\\//|| ||\\//|| ||\\//||




*have dramatic impact on phenotype
||\\//|| ||\\//|| ||\\//|| ||\\//||




(Notes: control patterns of development) ||\\//|| ||\\//|| ||\\//|| ||\\//||




Derived Traits - correct answer✔✔unique to taxa or group of interest (vs ancestral).
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Maximum Parsimony - correct answer✔✔fewer steps ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Maximum Likelihood - correct answer✔✔probability of trait changes ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Phylogenetic Trees - correct answer✔✔show patterns of decent, no phenotypic similarity ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||

, *do not indicate when species evolved or how much change occurred in lineage (unless
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




branch lengths are based on "molecular clock") ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




*should not assume taxon evolved from the taxon next to it ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




What good are phylogenic trees? - correct answer✔✔1. species conservation
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




2. see where diseases are coming from (ex: Chimpanzee SIV & HIV ancestral taxa)
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




3. engineer vaccines and treatments
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




4. Forensics (ex: illegal killing of whales. Help see where unidentified meat comes from)
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




*interpret phylogenies ||\\//||




How old is the Earth? - correct answer✔✔4.2 billion years old
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




How old are prokaryotes? - correct answer✔✔3.5 billion years old
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




How old are single-celled eukaryotes? - correct answer✔✔2.4 billion years old
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




Prokaryote - correct answer✔✔*bacteria or virus ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




*no membrane bound organelles
||\\//|| ||\\//|| ||\\//||




*uncondensed DNA ||\\//||




Eukaryote - correct answer✔✔*mitochondria ||\\//|| ||\\//|| ||\\//||




*membrane bound organelles ||\\//|| ||\\//||




*nucleus in membrane ||\\//|| ||\\//||




What does life depend on? - correct answer✔✔1. The ability to reproduce
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||




2. Harvest and metabolize energy
||\\//|| ||\\//|| ||\\//|| ||\\//||

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