BIO1130 Midterm2_MM_2011_Ans

BIO1130 Midterm2_MM_2011_Ans - BIO 1130MM - Midterm...

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Unformatted text preview: BIO 1130MM - Midterm Examination – November 12, 2011 Multiple choice questions - Place your answers on the answer sheet BIO 1130MM An introduction to Organismal biology Midterm examination Worth either 15% or 20% of your final grade Saturday, November 12, 2011 Part A: Multiple choice questions 30 points (1 point/question) a) Fill in the bubbles for your name and student number and BIO1130MM for the course code. Fill in the same information in text in the boxes above the bubbles. b) Use only a pencil to fill in the answer sheet. If you erase a question be sure to erase all of the pencil mark. Don’t place any marks anywhere on the sheet other than where the bubbles are for personal information or your answers. c) Do not place any answers on the question sheet. d) This is not an open book exam. e) CAUTION to minimize paper waste this part of the exam has been printed back to back NOTE: If you do not fill in the student number and course code as BIO1130MM it will be impossible to identify your answer sheet and you will receive a ZERO for this part of the exam Page 1 of 6 BIO 1130MM - Midterm Examination – November 12, 2011 Multiple choice questions - Place your answers on the answer sheet MM.1 The latent phase of an animal virus is X a. the equivalent of the lysogenic cycle of some bacteriophages. b. the time it takes to replicate the viral genome. c. the time it takes to assemble one viral particle. d. the period from infection to host cell lysis. MM.2 What is a major difference between mitosis and meiosis I? a. DNA replication takes place prior to mitosis, but not before meiosis I. b. Only meiosis I results in daughter cells that contain identical genetic information. c. Prophase is longer and more complex in mitosis. X d. Sister chromatids separate in mitosis, and homologues separate in meiosis I. MM.3 Arrange the following layers of a gram-negative bacteria from most external to most internal. = cell membrane, 2 = capsule and 3 = cell wall X 1 a. 3, 1, 2 b. 2, 1, 3 c. 2, 3, 1 d. 1, 2, 3 MM.4 The following question refers to structures found in a Ggram-positive prokaryotic cell. Which of the following is composed almost entirely of peptidoglycan? a. capsule X b. cell wall c. flagellum d. sex pilus e. endospore MM.5 Multicellularity and large body size of eukaryotic organisms requires high metabolic rates and efficient ATP production by aerobic respiration. How did bacteria change Earth's atmosphere to enable aerobic respiration? a. Anaerobic respiration by cyanobacteria increased the amount of oxygen in the atmosphere by reducing the amount of iron oxides that are able to react instantly with oxygen. b. Splitting of water during anaerobic respiration by cyanobacteria dramatically increased the amount of oxygen in the atmosphere. X c. Oxygenic photosynthesis by cyanobacteria significantly increased the amount of oxygen in the atmosphere. d. Nitrogen fixation by cyanobacteria decreased the amount of nitrogen in the atmosphere, leading to simultaneous increase of oxygen. MM.6 The presence of a lophophore in a newly discovered species would suggest which of the following? X a. This species is a suspension (filter) feeder. b. This species grows by shedding its cuticle. c. This species grows by shedding its exoskeleton. d. This species is probably an arthropod. Page 2 of 6 BIO 1130MM - Midterm Examination – November 12, 2011 Multiple choice questions - Place your answers on the answer sheet MM.7 Organisms that are neither coelomate nor pseudocoelomate should, apart from their digestive systems, have bodies that a. lack true tissues. b. are incapable of muscular contraction. c. are solid with tissue. X d. lack the ability to metabolize food. e. lack mesodermally derived tissues. MM.8 What do all deuterostomes have in common? a. Adults are bilaterally symmetrical. b. Embryos have pharyngeal pouches that may or may not form gill slits. X c. The pore formed during gastrulation becomes the anus. d. All have a spinal column. e. All have specialized head and tail regions. MM.9 What is characteristic of all ecdysozoans? a. agile, speedy, and powerful locomotion b. the diploblastic condition c. the deuterostome condition d. a pseudocoelom X e. some kind of exoskeleton, or hard outer covering MM.10 Which of the following is correctly associated with sponges? a. body cavity X b. osculum and spicules c. cnidocytes d. muscle cells and nerve cells MM.11 Members of this Mollusc class include octopuses, squids, and nautiluses. a. Polyplacophora X b. Cephalopoda c. Gastropoda d. Bivalvia MM.12 This bacterial cell covering enables bacterial cells to resist the defenses of host organisms: a. cell wall b. sex pilus c. endospore d. flagellum X e. capsule MM.13 During metamorphosis, echinoderms undergo a transformation from motile larvae to a sedentary (or sometimes sessile) existence as adults. What differentiates echinoderm adults, but not their larvae? Adults should a. lack mesodermally derived tissues. X b. have radial symmetry, or something close to it. c. be diploblastic. d. be diploblastic, and have radial symmetry, or something close to it e. be diploblastic, have radial symmetry, or something close to it, and lack mesodermally derived tissues. Page 3 of 6 BIO 1130MM - Midterm Examination – November 12, 2011 Multiple choice questions - Place your answers on the answer sheet MM.14 Members of which of the following phyla have a body divided into three regions: visceral mass, head-foot, and mantle? a. Platyhelminthes X b. Mollusca c. Rotifera d. Nemertea MM.15 The DNA of an organism is studied and found to contain 14% guanine. This organism should have ____% thymine and ____% cytosine in its DNA. a. 36; 14 X b. 14; 36 c. 36; 36 d. 14; 86 MM.16 Many physicians administer antibiotics to patients at the first sign of any disease symptoms. Why can this practice cause more problems for these patients, and for others not yet infected? X a. Overuse of antibiotics can select for antibiotic-resistant strains of bacteria. b. Antibiotics may interfere with the ability to identify the bacteria present. c. Antibiotics may cause other side effects in patients. d. The antibiotic administered may kill viruses that had been keeping the bacteria in check. e. Particular patients may be allergic to the antibiotic. MM.17 The purple non-sulfur bacterium Rhodospirillum grows best as a photoheterotroph. What are the most favorable sources of energy and carbon for this bacterium? a. glucose b. light and CO2 X c. fructose and light d. methane and CO2 MM.18 Bacteria and Archaea are most easily distinguished from each other by their: a. reproduction method. b. chromosome structure. X c. transcription and translation mechanism. d. habitat. MM.19 You are trying to identify an organism. It is an animal, but it does not have nerve or muscle tissue. It is neither diploblastic nor triploblastic. It is probably a a. flatworm. b. snail. X c. sponge. d. jelly. e. comb jelly. MM.20 Which of the following events marks the start of the Proterozoic eon? a. explosion of marine invertebrates and multicellular life b. The dominace of anaerobic life X c. A stable oxygen environment and the appearance of protists d. The origins of life Page 4 of 6 BIO 1130MM - Midterm Examination – November 12, 2011 Multiple choice questions - Place your answers on the answer sheet MM.21 An organism that obtains its energy from sunlight is a(n) X a. phototroph. b. chemotroph. c. autotroph. d. heterotroph. MM.22 Which of the following is a structure that permits bacterial conjugation to occur? a. endospore b. cell wall X c. sex pilus d. flagellum e. capsule MM.23 The beating flagellae of this cell maintain a constant flow of water through sponges. a. amoeboid cells b. porocytes X c. choanocytes d. pinacoderm MM.24 The major evolutionary split of protostome animals was into: a. segmented and nonsegmented animals. b. diploblasts and triploblasts. X c. lophotrochozoans and ecdysozoans. d. Coelomates and acoelomates. e. Arthropods and molluscs. MM.25 Each DNA nucleotide is made up of a. a six-carbon sugar, a nitrogenous base, and one of four amino acids. X b. a five-carbon sugar, a phosphate group, and one of four nitrogenous bases. c. a five-carbon sugar, a nitrogenous base, and one of twenty amino acids. d. a six-carbon sugar, a phosphate group, and one of twenty amino acids. e. a five-carbon sugar, a phosphate group, and one of four amino acids. MM.26 What do all the Lophotrochozoa phyla have in common? a. They have trochophore larvae, which swim with the aid of a ring of cilia. b. They expand their bodies continuously during growth. X c. They have members that reproduce sexually and members that reproduce asexually. d. They feed using lophophores, specialized ciliated structures. e. None of the above answers is correct. MM.27 What organisms are most numerous on Earth? a. eukaryotes b. insects c. archaea d. plants X e. prokaryotes Page 5 of 6 BIO 1130MM - Midterm Examination – November 12, 2011 Multiple choice questions - Place your answers on the answer sheet MM.28 The presence of cytoplasmic organelles is characteristic of a. Bacteria only. b. Archaea only. c. neither Archaea nor Bacteria. X d. both Archaea and Bacteria. MM.29 Which of the following is the most like ancestor of all animals? a. Unicellular protozoa b. Gram-bacteria X c. Colonial flagellated protist d. Colonial algae MM.30 How do the daughter cells at the end of mitosis and cytokinesis compare with their parent cell when it was in G1 of the cell cycle? a. The daughter cells have the same number of chromosomes and twice the amount of DNA. b. The daughter cells have half the number of chromosomes and half the amount of DNA. X c. The daughter cells have the same number of chromosomes and the same amount of DNA. d. The daughter cells have half the amount of cytoplasm and half the amount of DNA. e. The daughter cells have the same number of chromosomes and half the amount of DNA. Page 6 of 6 ...
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