6. Which one of the following statements is not true about the-NH: functional group. It a) b) accepts a proton when dissolved in water is found in amino acids c) d) e) is non-polar is found in purines it acts as a base in water 7. Polysaccharides, triacylglycerol, and polypeptides are all synthesized from monomers by The addition of water to each monomer a) b) c) d) e) The removal of water in a dehydration reaction The ionic bonding of the monomers The formation of disulfide bridges between the monomers None of these processes 8. Which of the following base sequences will form a short stretch of a DNA double helix a) 5′-AGCT-3′ with 5′-TCGA-3 b) 5-TATA-3 with 5′-UTUT-3 c) 5-GCGC-3 with 5-GCGC-3 d) 5′-AAAA-3 with 3′-UUUU-5 e) 5-AGCU-3′ with 3′-UCGA-5 9. The main purpose of the cell fractionation technique is to: a) view the structure of cell membranes b) measure the ionic gradients across cell membranes c) determine how molecules and ions move across the nuclear envelope d) separate organelles from each other so that their individual functions can be investigated e) break the plasma membrane in a way that releases the cytoplasm from the cell 10. Compare the cells in two different but similarly sized tissues. One tissue has cells with a high surface to volume ratio, the other has cells with a low surface to volume ratio. The cells with a lower surface to volume ratio will generally a) be less efficient at exchanging molecules and ions between its plasma membrane and its center b) be larger c) be fewer in number than those with a high surface to volume ratio d) have a relatively greater distance between their surface and center e) all of the above are correct 11. Which of the following would be less efficient without compartmentalizing cell functions? a) b) c) d) e) the control of intracellular calcium the synthesis of ATP using the energy from the breakdown of glucose the folding of complex proteins into their final biologically active form the digestion of cellular organelles by lysosomal enzymes all of the above