Problem Set 2 BILD10 / Winter 2012 Chapters 3-4 Traver 1) Interacting systems of molecules enclosed in compartments called __________ evolved 3.8 billion years ago in living organisms. a) brains b) organs c) circulatory systems d) mitochondria e) cells 2) Which of the following is found in both prokaryotic and eukaryotic cells? a) Golgi apparatus b) ribosome c) centriole d) lysosome e) peroxisome 3) Prokaryotic organisms lack: a) replicator molecules (DNA or RNA). b) cell membranes. c) metabolism. d) organelles. e) All of the above. 4) Which of the following is a cellular characteristic of ALL eukaryotes? a) a nuclear membrane b) few to no organelles in the cytoplasm c) a cell wall d) a nucleoid e) few to no proteins associated with the DNA 5) Eukaryotic cells may contain all of the following EXCEPT: a) a membrane-bound nucleus. b) a peptidoglycan cell wall. c) flagella. d) photosynthetic pigments. e) ribosomes. 6) According to the theory of endosymbiosis, the origin of chloroplasts probably involved: a) the formation of cell walls around the photosynthetic pigments. b) the formation of colonies of cyanobacteria. c) the engulfing of small photosynthetic prokaryotes by larger cells. d) the accumulation of free oxygen in ocean waters. e) All of the above are correct.
Problem Set 2 BILD10 / Winter 2012 Chapters 3-4 Traver 7) The object depicted in the figure: a) is a bacterial cell. b) could be either a plant or an animal cell. c) is a plant cell. d) is an animal cell. e) is a ribosome. 8) The lipids within the fluid mosaic of the plasma membranes are held in place by: a) covalent bonds. b) hydrophobic interactions. c) hydrogen bonds. d) disulfide bridges. e) ionic bonds. 9) What are the two distinct “faces” of the phospholipids that make up the surface membrane of a cell? a) a hydrophilic head and a hydrophobic tail b) a hydrophobic head and a hydrophilic tail c) a phosphate group head and two fatty acid tails d) Both a) and c) are correct. e) Both b) and c) are correct. 10) Which of the following is the outermost feature on the surface of a plant cell? a) lipid bilayer b) cholesterol c) cell wall d) glycoproteins e) sugar molecules 11) The figure shows the action of beta-blockers in reducing anxiety. In this diagram, the triangular wedges represent ________________, the figures with rectangular tops and triangular bottoms represent ______________, and the ovals represent ______________. a) beta-blocker chemicals; adrenaline; beta-receptors b) adrenaline; beta-blocker chemicals; beta-receptors c) adrenaline; beta-receptors; beta-blocker chemicals d) beta-blocker chemicals; mucus; beta-receptors e) mucus; beta-blocker chemicals; beta-receptors
Problem Set 2 BILD10 / Winter 2012 Chapters 3-4 Traver 12) Which of the following is the most important factor governing a cell’s particular type of interaction with other cells?
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