Chapter Questions
The main structural component of the cell membrane is the [name the molecule].
How does archaea's preference to live in extreme environments relate to its ancestry?
Label the following diagram (A-E) of a cell membrane with the following terms: hydrophilic phosphate group, phospholipid bilayer, protein, phospholipid, hydrophobic tails.
Why would transmembrane proteins (also called integral proteins) beuseful in transport of things into and out of the cell?
Some cells have the ability to change the percentage of saturated versus unsaturated phospholipids in their cell membrane. Assume there is a bacterium whose membrane was composed of $50 \%$ saturated and $50 \%$ unsaturated phospholipids. If this cell suddenly was exposed to much colder temperatures, what might happen to the percentage composition of its cell membrane in order to try and maintain a "normal" fluidity?
Which cell type is smaller and lacks organelles?
Life is defined by a number of characteristics: list the eight characteristics of life covered in the chapter.
Choose the right term from each of the following pairs: A single phospholipid is amphipathic, meaning the phosphate head group portion of the molecule is polar/nonpolar and loves/hates water, whereas the two fatty acid chains are polar/nonpolar and loves/hates water.
Choose the correct term: If a cell lived in very hot conditions (such as a volcanic deep-sea vent), its phospholipids would be composed of more unsaturated/saturated fatty acids in order to prevent the cell membrane from becoming too fluid.
List three possible roles for cell membrane proteins, and provide a brief description of each.
For each of the following, indicate whether it is found in a bacterial cell. Write $Y$ if it is found in prokaryotes, and $N$ if it is not found in prokaryotes:a. Cell membraneb. Nucleusc. Flagellad. DNAe. Cell wallf. Ribosomesg. Mitochondrion (an organelle)h. Nucleoid
What is an advantage to prokaryotic cells' simplicity?
For the following multiple-choice question, choose the best answer. Which of the following is the smallest thing that could be considered alive?a. An atomb. A moleculec. A virusd. An amoebae. A tree
How is a cell able to maintain internal conditions different from its surroundings?