Exam 1 SC135 spring 2011 Page 1
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1 xam 1 S135 spring 2011 Page 1 Name: ate: 1 Which other item is worth the same (has the same weight) as your lecture exams toward your final grade? quizzes writing assignments participation presentation 2 There is a cumulative final in this course. 3 ancer is a singular kind of disease is a specialized tissue is characterized by cells that divide uncontrollably is 4 y knowing there are 793,000 US citizens with skin cancer, you know something about the of cancer. prevalence incidence oncology epidemiology 5 What characteristic of life is not shared by all living organisms? they make their own energy they grow and develop they are composed of cells they evolve through time 6 The process that an individual organism goes through to go from a single cell to its adult form is known as evolution development both evolution and development 7 Which of the following is likely to be able to reproduce asexually? caterpillar cricket fish plant
2 xam 1 S135 spring 2011 Page 2 8 n organism that starts as an egg, becomes a larvae then a pupae then an adult (like caterpillars to butterflies) is displaying which characteristic of life? Organisms evolve Organisms grow and develop Organisms capture energy Organisms are made of cells 9 Which of the following is an example of an organism sensing their environment? feeling hunger feeling thirsty feeling cold 10 The hereditary genetic material most organisms use for reproduction is protein carbohydrate lipid N 11 ll living organisms sense their environment and respond to it Given that carbon has an atomic number of 6 and an atomic mass of 12, how many neutrons does carbon have? (answer by entering a number) Given that oxygen has an atomic number of 8 and an atomic mass of 16, oxygen has how many valence electrons? (answer by entering a number) The smallest unit of a chemical element that still has the properties of that element is a(n) amino acid molecule atom bond 15 neutron has charge no a negative a positive
3 xam 1 S135 spring 2011 Page 3 16 Which of the following statements is true of hydrogen bonds they are stronger than covalent bonds they form between polar molecules they form between atoms of opposite charge they are due to protons repelling each other 17 Valence electrons are all the electrons in an atom are only those electrons in the inner most orbital are only those electrons in the outermost orbital 18 Water is a good solvent because it is a polar covalent molecule is a covalent molecule is an ionic compound contains ions 19 Which atom is likely to form an anion lithium (Li) - atomic number 3 fluorine (F) - atomic number 9 carbon () - atomic number 6 helium (He) - atomic number 2 20 Oil and water do not mix together well because water is polar and oil is nonpolar only identical molecules of the same chemical can easily mix together water has hydrogen bonds and oil is polar water and oil are covalently bonded together 21 n atom is in its most stable state when all of its electron shells are filled to capacity.
4 xam 1 S135 spring 2011 Page 4 22 In the diagram, the functional group shown is hydroxyl amino carboxyl phosphate 23 How many atoms of oxygen are in sucrose? (the chemical formula is shown) We use soap to clean ourselves better than we could with water alone. Soaps contain phospholipids which are responsible for the cleansing action. Which of the following statements is the most likely explanation for how soap works? phospholipids are ions and therefore mix with both the water and dirt phospholipids are completely hydrophilic and therefore dirt takes the place of the phospholipid molecules that would be dissolved in the rinse water the phospholipid tail attaches to the dirt while the phospholipid head interacts with the rinse water and carries the dirt (and soap) away with it the nonpolar fatty acid chains that make up the heads of the phospholipid are hydrophilic and thus are repelled by the water 25 Peptide bonds form between glycerol molecules monosaccharides amino acids fatty acids
5 xam 1 S135 spring 2011 Page 5 26 arbon dioxide (shown in the picture) is an organic molecule. 27 the functional group found in all organic acids is hydroxyl amino phosphate carboxyl acidic 28 The monomer of proteins is amino acid fatty acid monosaccharide nucleotide peptide 29 Two monosaccharides are joined to form a disaccharide in the process of dehydration synthesis polymerization hydrolysis 30 You test an unknown food item in the lab using enedict's reagent. fter boiling the food with the reagent for 2 minutes, the color of the contents of the tube turn brick red. From these results, you conclude that the food is a monosaccharide starch lipid protein 31 Which test would you NOT do for a lipid? grease spot test solubility in polar and nonpolar solvents sudan red test biuret test
6 xam 1 S135 spring 2011 Page 6 32 Simple sugars (monosaccharides) react with Lugol's iodine. 33 Using the picture (figure 1 at the end of the exam), the organelle responsible for modifying proteins is 34 Using the picture (figure 1 at the end of the exam), the part labeled "" is composed of amino acids carbohydrates phospholipids nucleic acids fatty acids 35 Using the picture (figure 1 at the end of the exam), N is found in 36 The boundary that surrounds the nucleus is the plasma membrane nuclear envelope nuclear pore cytosol 37 In appearance, the Golgi apparatus resembles a sphere with internal membranes an oval without internal membranes stacks of flattened membrane sacs a long, fat cylinder of membrane material 38 Which of the following statements about mitochondria and chloroplasts is false? they were probably primitive prokaryotic cells they contain their own N they each are composed of 2 membranes they each contain lysosomes
7 xam 1 S135 spring 2011 Page 7 39 The main function of mitochondria is to produce energy produce N produce proteins produce lysosomes 40 You are looking at a cell under a microscope and trying to determine whether it is a prokaryote or a eukaryote. You know it is a eukaryote if you see N a plasma membrane a nucleus a cell wall 41 Proteins in the plasma membrane are completely surrounded by phospholipids are able to move around in the membrane are held rigidly in place by fatty acids and ribosomes move molecules into but not out of cells 42 Information passes between the nucleus and the rest of the cell through nuclear pores nuclear envelopes nuclear vesicles 43 The function of a ribosome is to create phospholipids 44 You are observing a cheek cell under the microscope and it looks 100 times bigger than it truly is. The objective that you have in place is the scanning objective (4x) low power objective (10x) high power objective (40x) oil immersion objective (100x) 45 When using a microscope - If you have a specimen in focus and you want to change objectives to the next, more powerful, magnification, you should move the stage down first.
8 xam 1 S135 spring 2011 Page 8 46 The iris diaphragm helps you bring a specimen into focus. 47 Which molecules can diffuse into a cell? Oxygen arbon ioxide Small hydrophobic molecules steroids 48 Insulin diffuses into cells opens channel proteins so glucose can diffuse into cells is an active transport mechanism 49 The picture depicts two solution of glucose ( is 40% glucose, is 5% glucose) with a semi-permeable membrane between them. Which of these is true? Water will flow from to Water will flow from to Glucose will flow from to Glucose will flow from to 50 Your white blood cells engulf bacteria by exocytosis endocytosis filipodia cell junctions.
9 xam 1 S135 spring 2011 Page 9 nswer Key : xam 1 S135 spring 2011 Question: nswer 6 (+/- 0%) 6 (+/- 0%)
10 xam 1 S135 spring 2011 Page
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