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BIOL 1000 - Test 1 2014

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BIOL 1000
William Pietro

Test  1  –  Section  M  –  January  31,  2014  –  FOR  POSTING   BIOL  1000  Section  M  –  Test  1  –  January  31,  2014   Note:  Question  and  Answer  Order  Varied  with  Test  Version     1. VERSION QUESTION 2. In the phylogentic tree below which letter represents the ancestor common to only Archaea and Eukaryotic organisms. D A C   B   A. A B. B C. C D. D 3. Research suggests that the endomembrane system likely evolved from the A. Membrane of an engulfed bacterium B. Nuclear membrane C. Plasma membrane D. Endoplasmic reticulum membrane 4. Eukaryotic extra-nuclear DNA is A. Not present in eukaryotes. B. Found in mitochondria. C. Found in the cytosol as plasmids. D. Found in the central vacuole. 5. When compared to an eyespot, what aspect of the pinhole eye permits finer directionality sensitivity? A. Eye cup B. Photopigments C. Lens D. Cornea   Page  1  of  5   Test  1  –  Section  M  –  January  31,  2014  –  FOR  POSTING   6. A neutrophil engulfs a bacterium. The bacterial plasma membrane is most related to which of the following. A. Eukaryotic plasma membrane B. Outer membrane of the nucleus C. Inner membrane of the endoplasmic reticulum D. Inner membrane of a mitochondrion 7. A researcher examines an unidentified single celled eukaryotic organism. He notes that this organism resulted from secondary endosymbiosis. What did he observe to make this conclusion? A. Mitochondria with two membranes. B. Chloroplasts with four membranes. C. A double nuclear membrane. D. Vesicles resulting from endocytosis (endocytotic vesicles). 8. A common element that links the Theory of Evolution with Cell Theory is that A. All organisms are the result of natural selective forces. B. The need to adapt to changing environments drives the development of new organismal features. C. Unity and diversity are apparent when comparing populations. D. All living organisms share a common ancestor. 9. An opsin associated with a bacteriorhodopsin in a Halobacterium changes conformation. What has lead to this change? A. Light was detected by photoreceptors at the retina. B. ATP synthase was activated. C. The organism moved from a dark to light environment. D. The associated chlorophyll molecule absorbed a photon of light. 10. A gene has never been transcribed in an individual cell. What is likely the reason for this? A. rRNA is lacking in the nucleus. B. This section of DNA is associated with heterochromatin. C. Only non-histone proteins are associated with this section of DNA. D. The associated mRNA is unable to exit through a nuclear pore. 11. Old World monkeys developed trichromatic vision where as New World monkeys retained dichromatic vision. Which of the following could explain why Old World monkeys have trichromatic vision. A. Since colours in the red spectrum exist in the Old World, it was necessary to develop a method for detecting these wavelengths. B. Trichromatic vision improved the chance of survival. C. The monkeys chose to use vision instead of touch to discriminate unripened from ripened fruit. D. All of the above are possibilities.   Page  2  of  5   Test  1  –  Section  M  –  January  31,  2014  –  FOR  POSTING   12. A researcher discovers a new molecule and notes that it contains a series of carbon atoms linked by alternating single and double covalent bonds. This molecule is likely involved with. A. Skeletal muscle contraction B. Flagellar movement in bacteria C. Cell-cell adhesion D. Photon capture 13. What is the sarcoplasmic reticulum? A. Specialized rough endoplasmic reticulum involved in muscle contraction. B. Specialized smooth endoplasmic reticulum that stores calcium. C. Specialized rough endoplasmic reticulum involved in drug detoxification. D. Specialized smooth endoplasmic reticulum that produces proteins. 14. The 9+2 complex in eukaryotic flagella is in reference to which cellular structure? A. Actin filaments B. Flagellin proteins C. Microtubules D. Dynein motor proteins 15. Contents from inside the small intestine are leaking between cells into the body cavity. This is most likely caused by a problem with which of the following. A. Plasmodesmata B. Tight junctions C. Adherens junctions D. Desmosomes 16. Which of the following best describes the term “theory”, as used in science? A. A concept that is unsupported but considered correct by many people. B. A concept that, once established in the scientific literature, can never be modified or rejected. C. An educated prediction that is both testable and falsifiable. D. A well-supported concept that has broad explanatory power. 17. You are examining an unknown cell. You note that it contains ribosomes, DNA, mitochondria and a cell wall
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