1)Cell walls are rigid and resist expansion, which allows thepressure to build inside a cell when it absorbs water. The forceexerted by pressing water against the cell wall is called [BLANK1],which is a key feature that allows plants to stand upright.
2)Prokaryotes concentrate DNA in a discrete region of the cellinterior known as the BLANK . They often contain additional smallcircular molecules of DNA known as BLANK that carry a small numberof genes that are commonly transferred between bacteria throughthread-like hollow structures known as BLANK . Genes for antibioticresistance are transferred, which accounts for the quick spread ofantibiotic resistance among bacterial populations.
3)The [1BLANK] is a rigid structure that surrounds the plasmamembrane of some organisms to help maintain the cell shape andvolume and also functions in support and protection.
4)
The shape of thephospholipid structure is determined by the bulkiness of the headgroup relative to that of the hydrophobic tail. Lipids with bulkyheads and a single hydrophobic fatty acid tailforms  spherical structures called what?
| A. | Bilayer |
| B. | Micelles |
| C. | Liposome |
| D. | Lysosome |
5)The BLANK and BLANK are both semi-autonomous organelles thatgrow and multiply independently and contain their own genomes.
6)Protein sorting is a process by which proteins end up wherethey need to be to perform their function.  Proteinsproduced by free ribosomes are often directed to their propercellular compartments by means of particular amino acids calledsignal sequences.
Match the type ofsignal sequence used in the making of proteins that direct them tothe correct cellular destination.
|     -     A.    B.     C.  | No signal sequence | |     -     A.    B.     C.  | Amino-terminalsequence | |     -     A.    B.     C.  | Internal signalsequence |
| | A. | Proteins directed toremain in the cytoplasm | | B. | Proteins directed tothe mitochondria or chloroplast | | C. | Proteins directed tothe nucleus |
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