BIOL 112 Midterm: mid-term key 2013.docx

• School: UBC
• Department: Biology
• Course: BIOL 112
• Professor: All

Document Summary

Also, if i ask for one reason then provide only one reason. #1 (2 marks) identify two structures that all cells possess but viruses lack? ribosomes or any other enzymes at all cell membrane cytoplasm. In prokaryotes, the cell wall holds things in, and protects against lysis this is not a mark worthy answer for prokaryotes, especially considering all the other important functions of prokaryotic cells. They lipids of the cell membrane are isoprenes not fatty acids. Due to cross-membrane bonds and intramolecular rings, isoprenes are more stable at high temperatures than fatty acids. #4 (2 marks) which of the following molecules are able to diffuse easily through a cell membrane: #5 (1 mark) a new prokaryotic cell was discovered that contained no peptidoglycan. A gram negative (gm ve) rod containing 10 mm concentration of glucose in its cytoplasm is placed in a 0. 15% solution of glucose.