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TAMU BIOL 111 - TEST 2 Bio

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Question 1Hydrolysis is involved in each of the following EXCEPTconversion of DNA to a mixture of four deoxynucleotidesconversion of glycogen to glucoseconversion of glucose to starchconversion of triacylglycerol to a mixture of fatty acids and glycerolQuestion 2Which of the following shows carbohydrates arranged according to increasing number of sugar units?glucose, glycogen, maltosefructose, sucrose, chitinlactose, cellulose, galactoseribose, galactose, starchQuestion 3Which of the following DOES NOT support the fluid mosaic model?Membrane is composed of various biomolecules with properties affected by temperatures changes.Membrane proteins from cells of two different organisms will never be found mixed together in a hybrid cell.The presence of cholesterol greatly influences membrane fluidity.Phospholipids move laterally within the plane of the membrane.Question 4The graph shows the relative amounts of saturated (black bars) and unsaturated (white bars) fatty acid groups in the cell membranes of three different plant types. Recall that cholesterol is absent in plant cell membranes. Assuming all other membrane components and their amounts are similar for the three plant types, which of the following is TRUE?Plant B most likely lives in cooler soils compared to A and C.Plant C most likely lives in cooler soils compared to A and B.Membrane fatty acid composition doesn’t have anything to do with plant habitat.Plant A most likely lives in cooler soils compared to B and C.Question 5You are trying to identify a cell by looking at it under a powerful microscope. You identified the ribosomes, nucleus,cell wall, smooth and rough ER. Which of the following could it be?a leaf cell from a Bluebonnet planta cell under the domain archaeaa Bacillus speciesa cell from rat ovarythe presence or absence of internal membranes partitioning the cellwhether or not ribosomes are presentthe presence or absence of double-stranded DNAthe number of cells present (i.e. unicellular vs. multicellular)Question 6Which of the following distinguishes a eukaryotic cell from a prokaryotic cell?Question 7The lengths of four different cell types are as follows: cell A –0.03 mm, cell B – 0.0075 cm, cell C – 15,000 nm and cell D – 0.1 μm. Arrange the cells in order of increasing lengths.D < C < A < BB < C < A < DNone of these optionsD < A < C < BB < A < C < DQuestion 8Which of the following interactions is involved in forming the primary structure of a protein?ionic bondcovalent bondhydrophobic interactionhydrogen bondQuestion 9What would be the molecular formula for a polymer made from eight glucose (C6H12O6) molecules linked together by dehydration reactions?C48H80O40C48H96O48C48H82O41C48H110O62Question 10The basis for dividing the prokaryotes into two domains is:differences in the ability to survive in extreme conditions.none of the choicesdifferences in metabolic properties.differences in genome sequences.Question 11Because humans lack the enzyme which recognizes α-1,4-glycosidic linkagesBecause starch has a lot of branched regions allowing a greater surface area for easy digestion in humansBecause cellulose has a lot of branched regions making it difficult for the enzymes to find the cleavage points for complete digestion in humansBecause humans lack the enzyme which recognizes β-1,4-glycosidic linkagesWhich of the following explains why humans can digest starch but not cellulose?Question 12Which of the following statements is FALSE?A protein built into a membrane may function as an enzyme.Integral proteins may extend only partway into the hydrophobic interior.Peripheral proteins may or may not be embedded in the lipid bilayer.Carbohydrates can associate with membrane proteins.Question 13Which of the following characteristics is NOT shared by bacteria and archaea?absence of nuclear membranepresence of plasma membranepresence of ribosomesidentical cell wall compositionRefer to the figure below. Which of the following statements is TRUE?It is highly water soluble because of its strongly polar hydroxyl group.This is never found in membranes because it extensively clogs blood vessels and causes diseases in organisms.Regardless of temperature changes, the presence of this molecule in membranes always reduces membrane fluidity.It is considered an amphipathic molecule.Question 15Which of the following does NOT describe a biological membrane?It is a collage of proteins, embedded in the fluid matrix of the lipid bilayer.Its components get transported through vesicles, whose outside face becomes continuous with the membrane cytoplasmic face.Its protein and lipid components are symmetrically distributed.Carbohydrate portion of its glycoproteins are positioned on the extracellular


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