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A midterm exam for a life science course, specifically bio 1110, designed to assess students' understanding of fundamental concepts in biology. The exam consists of multiple-choice questions covering a range of topics, including atomic structure, chemical bonds, macromolecules (proteins, nucleic acids, lipids, and carbohydrates), cell structure and function, membrane transport, enzymes, and cellular respiration. The questions test students' knowledge of key terms, processes, and principles in cell biology and biochemistry. It serves as a valuable resource for students preparing for similar exams or for reviewing core concepts in life science. The exam includes questions on the properties of water, the structure of proteins, the function of cellular organelles, and the processes of glycolysis and the citric acid cycle. It provides a comprehensive overview of essential topics in introductory biology.
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How many neutrons does an atom of Na have if its atomic number is 11 and its mass number is 23? 34 23 11 12 The sharing of electrons to form a bond is called a hydrogen bond covalent bond ionic bond peptide bond The monomers for proteins are fatty acids amino acids nucleic acids monosaccharides
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RNA has all of the following nitrogenous bases except guanine uracil thymine cytosine The phospholipid bilayer is composed of polar phosphate heads and polar hydrophilic tails polar phosphate heads and nonpolar hydrophobic tails nonpolar hydrophilic tails and nonpolar phosphate heads nonpolar phosphate heads and polar hydrophilic tails All of the following are types of lipid except fats phospholipids starch steroids
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primary protein structure tertiary protein structure secondary protein structure quaternary protein structure Water is formed when two hydrogens and one oxygen form a nonpolar covalent bond form hydrogen bonds form an ionic bond form a polar covalent bond Energy is the capacity to cause change. True False If a plant cell is placed in deionized water, it will burst. True
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False The engulfment of particulate matter by the cell is termed pinocytosis excocytosis osmosis phagocytosis Movement of molecules down their concentration gradient through a protein channel in a membrane is called simple diffusion active transport facilitated diffusion osmosis A fatty acid without any double bonds in its hydrocarbon chain is termed monounsaturated triglycerides polyunsaturated
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Oxygen has an atomic number of 8. In order to fill its outer electron shell, how many electrons does it need? 0 2 3 1 Water has unique properties such as its cohesive and adhesive properties, its high heat of vaporization and its ability to store heat which are all due to ionic bonds Van der Waals forces covalent bonds hydrogen bonds A pH of 10 is considered to be acidic basic none of the above neutral
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The building blocks or monomers of carbohydrates are monosaccharides amino acids fatty acids nucleic acids Eukaryotic cells have all of the following except mitochondria nucleoid regions ribosomes lysosomes Disorder is continuously increasing is the 1st Law of Thermodynamics 2nd Law of Thermodynamics Law of Conservation of Energy Law of Diffusion
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a substrate activator Enzymes are recycled after a reaction occurs. True False Denaturation of an enzyme can be caused by noncompetitive inhibitors none of the other answers are correct a change in pH competitive inhibitors Tertiary protein structure is exemplified by the interaction of subunits the amino acid sequence alpha helices and beta pleated sheets the overall protein shape
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Which of the following are not prokaryotes? bacteria E. coli archaea mushrooms Which of the following are the main components of membranes? phospholipids cholesterol steroids triglycerides Primary protein structure is characterized by the overall 3-dimensional shape the sequence of amino acids alpha helices pleated sheets
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All of the following are true regarding enzymes except they have an active site where the substrates bind they lower the energy of activation they are consumed by the reaction they are biological catalysts Movement of molecules against their concentration gradient is called active transport osmosis passive diffusion facilitated diffusion The transport of macromolecules into a cell is called endocytosis. True False Water molecules have a
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positive charge around the oxygen partial positive charge around the hydrogens partial negative charge around the hydrogens partial positive charge around the oxygen Facilitated diffusion requires energy. True False Nutrients flow through an ecosystem while energy is recycled. True False Glycolysis takes place in the outer mitochondrial membrane cytoplasm
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2 ATP, 2 NADH, and 1 pyruvate The movement of protons through ATP synthase occurs from the intermembrane space to the mitochondrial matrix intermembrane space to the cytoplasm mitochondrial matrix to the intermembrane space mitochondrial matrix to the cytoplasm In yeast cells, fermentation results in the production of lactate, NAD, and carbon dioxide ethanol, oxygen, and NAD ethanol, NAD, and carbon dioxide lactate and NAD During cellular respiration, glucose is converted to water is oxidized
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is reduced is used to produce oxygen
