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BOT 105 Practice Exam #1
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How many daughter cells does meiosis produce, what ploidy do they have, and what is unique about them?
Four genetically unique haploid cells (gametes)
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What is unique about the life cycle of Rhodophyta?
It is triphasic meaning there is an alternation of two diploid or sporophyte generations (3 total).
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What is the storage product of heterokonts?
Chrysolaminarin
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What phase of meiosis does random assortment occur?
Metaphase I
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True or False: There are only multicellular brown alga
True!
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What are the names of the male and female gametangium in water molds?
Antheridium(a) and Oogonium(a)
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What phyla fall under the Viridiplantae descriptor?
Chlorophytes and Embryophytes
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Which phase of mitosis is shown?
Telophase/Cytokinesis
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What is the function of the pores in a diatom's frustule?
Gas and nutrient exchange
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What do you call the point at which chromosomes touch during crossing over?
Chiasma/Chiasmata
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What are thylakoids?
Photosynthetic membranes in the chloroplast stacked in grana.
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Define synapomorphy.
A shared derived trait.
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How would you define a polyphyletic group?
A group consisting of two or more taxa with separate common ancestors.
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What is the difference between parasitism and being saprophytic?
Parasitism = Feeding on a living host Saprophytic = Consuming dead organic matter from plants or animals
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True or False: Prokaryotes are larger than Eukaryotes
False
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This cladistic descriptor means a uniquely derived character.
Autapomorphy
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At what stage are the chromosomes doubled in meiosis and mitosis?
During the DNA synthesis phase of interphase (S phase)
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What is the name of roundly shaped bacteria?
Cocci
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What are three source of genetic variation in meiosis?
1.) Crossing over in Prophase I 2.)Random Fusion of Gametes From Different Parents 3.) Random Assortment of Chromosomes
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What is the ploidy of a carpospore and what does it form in red algae?
Diploid, Tetrasporophyte
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A cell has 15 chromosomes at G1 phase of Interphase, how many does it have at G2?
30 Chromosomes
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How would you define a monophyletic group?
AKA clade, it is the group that includes a common ancestor and all of its descendants.
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What are advantages for sexual reproduction? Disadvantages?
Pros: Genetic diversity in offspring, less likely to be wiped out by disease, more stable populations, etc.
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What is the name of this structure found in the fucus life cycle? What does it house?
Conceptacle, contains reproductive organs
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In the spirogyra life cycle, what does the fusing of gametes form and what does this become in mature cells?
Zygospore, vegetative fillament
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What defines a true chloroplast?
Double membrane bound organelle with stacked thylakoids and no phycobilisomes.
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Spirogyra and coleochaete are in the same sub class of green algae and have the same life cycle. What are they?
Streptophyta and haplontic life cycle
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This group consists of a common ancestor but not all descendants.
Paraphyletic group
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What does a phenotype express?
Observable characteristics of an individual
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Which type of gamete is shown below?
Isogamy
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Which protists are classified as heterokonts?
Diatoms and brown algae
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What was the second organelle to develop from primary endosymbiosis?
Chloroplast
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What cladistic group do diatoms fall under?
Monophyletic/ Clade
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What is unique about the crustose coralline red algae?
It is the deepest growing alga at a depth of 820 feet, which is 300 feet deeper than any other photosynthetic organism.
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In phylum Rhodophyta, what is present instead of plasmodesmata?
Pit plugs - they connect cells together which reduces extracellular travel
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Name three characteristics or functions of Mitochondria
Cellular respiration, Double membrane bound, Production of ATP (Powerhouse of cell)
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What are the three pillars that make up modern systematics?
Scientific method, evolution, classification of biodiversity
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What is the storage carbohydrate for green alga?
Starches
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True or False: Akinetes are found in eukaryotic Cyanobacteria
False
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What are the phycobilisome pigment proteins?
Phycoerythrin, phycocyanin, and allophycocyanin
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What are the phases of Interphase?
G1, S, G2, and meiosis/mitosis
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Clades or taxa that share an immediate common ancestor.
Sister Taxa
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What are the two types of flagella in biflagellated sperm?
Tinsel flagellum (long/hairy) and Whiplash flagellum (short/smooth)
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What are separated during metaphase I? What about metaphase II?
Homologous chromosomes and sister chromatids
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This grouping comes from the development of a trait or character that is found in two species who do not share a common ancestor.
Homoplasy
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What is symplesiomorphy?
Shared ancestral character/trait
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What is the heterocyst involved with?
Nitrogen fixation in cyanobacteria
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What happens during prophase I that contributes to genetic diversity?
Crossing over
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Which component of DNA is associated with "Beads on a String"?
Histones
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Which phyla and type of life cycle is represented?
Rhodophyta - Diplohaplontic
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What is the correct pairings for the following: Oospores, zoospores, asexual reproduction, sexual reproduction
Oospores - sexual reproduction Zoospores - asexual reproduction
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How do diatoms reproduce and what is their life cycle?
Asexual mitotic reproduction with a diplontic life cycle
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What is the storage carbohydrate for Oomycota?
Glycogen
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This bacteria morphology is pill shaped
Baccilli
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What is unique about the Oomycota life cycle?
It utilizes both sexual and asexual reproduction
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What do you call the filamentous body plan of Oomycota? What are the filaments made of?
Mycelium, Hyphae
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What is the reserve carbohydrate in Rhodophyta?
Floridean starch
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What type of life cycle does fucus have?
Diplontic
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What is the process of conjugation in Spirogyra?
Asexual reproduction involving two neighboring cells.
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This bacteria morphology is characterized by a spiral shape
Spirilla
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