CSU Life 103 Final Exam 2024 Questions And Answers With Verified Study Solutions

Eukaryotic cells evolved when an ancestral host cell, probably a ____________ formed a mutualistic, endosymbiotic relationship with ______________ - Answer-Archaean; an alphaprotobacteria Snowball Earth Hypothesis suggests the hardened, spiny exoskeleton evolved as a result of: - AnswerRelease of calcium after global glaciations You find a colony of single celled organisms that are living (thriving and reproducing) in an extreme environment, such as an alkaline or reducing environment. Which group are they most likely to belong to? - Answer-Archaea Which of the following is a way that prokaryotes generate new genetic variation? - AnswerTransformation (exchange with the environment) Conjugation (exchange with other cells) Transduction (exchange via viruses) Which of the following metabolic strategies are NOT found in eukaryotes? - Answer-Photoheterotrophy The host cell that is thought to be the ancestor of all eukaryotes was probably: - Answer-Anaerobic What do all members of the eukaryotic group Unikonta have in common? - Answer-Chemoheterotrophy When does meiosis happen in the fungal life cycle? - Answer-Immediately after karyogamy Which eukaryotic group colonized terrestrial landscapes first? - Answer-Fungi Lichens are: - Answer-A mutualism between fungi and algae In ALL land plants, the sporophyte is: - Answer-The multicellular structure that produces sporesIn plants, which of the following are produced by meiosis? - Answer-Haploid spores A characteristic of seedless vascular plants that likely limited their ability to colonize dry terrestrial landscapes is: - Answer-Flagellated sperm A megasporangium produces a: - Answer-megaspore In which life stage are land plants less sensitive to the effects of ultraviolet (UV) radiation? - AnswerSporophyte In seed plants, where does the integument (or seed coat) of the seed come from and what is its ploidy? - Answer-Parent sporophyte; 2n Photosynthesis in plants occurs in: - Answer-Ground tissues After a signal is received by a receptor molecule (such as a phytochrome), what process is responsible for amplifying the cells response to that signal? - Answer-Signal transduction You might expect the roots of a young plant to exhibit: - Answer-Negative phototropism Plants use phytochromes to detect the quality of light by: - Answer-Switching between red and far red forms after exposure to light Seed germination is caused by changes in gene expression in the embryo when _______ enters the nucleus. - Answer-Pfr In general, pollination strategies in angiosperms are shaped by evolution that favors - Answer-Increased efficiency of pollination The majority of the coevolutionary diversification of angiosperms and insects can be explainedby: - Answer-Herbivory and pollination The most diverse animal phyla (those with the most species): - Answer-Have colonized terrestrial habitats The presence or absence of a coelom (whether a "true" coelom or pseudocoelom) was once used as important evidence of relationships among animal phyla. Our current understanding of relationships among animal phyla is based on what kind of evidence? - Answer-Molecular characters (DNA evidence) Mollusks have the most diverse body plans of any animal phylum. However, ALL mollusks make these diverse body plans from a simple set of shared features, which are: - Answer-A mantle, visceral mass, and foot Insect maximum size seems to be limited by: - Answer-Insect tracheal systems rely on simple diffusion to get oxygen to tissues Homeostasis is desirable because: - Answer-Enzymes have optimal ranges Organ systems responsible for excretion, gas exchange, and circulation (among others) are all systems that help increase _________________ in multicellular organisms. - Answer-Surface areas for exchange Poikilotherms are: - Answer-Animals that allow their body temperature to vary A hibernating bear (a mammal) is: - Answer-Endothermic, heterothermic, and homoiothermic Which of the following accurately describes counter current heat exchange? - Answer-A mechanism for reducing heat exchange by reducing the temperature of distal limbs.