Oils, fats, and waxes are included among which of the following classes of organic compounds?
Answer(s): C
These macromolecules are all lipids, a class of organic compounds that contains fats, phospholipids, and steroids. The building blocks (monomers) for some lipids are fatty acids. Therefore, fatty acids may be a component in lipids but lipids such as oils, waxes, and fats are not fatty acids themselves.
Which of the following eukaryotic organelles is correctly linked to its function?
Answer(s): A
Only the Golgi is correctly matched with its function. The Golgi complex (or apparatus) is responsible for adding sugar groups to proteins in order to make sure that the proteins are shipped to the right places, mainly out of the cell. Ribosomes are involved in reading RNA for protein synthesis, not building the RNA; lysosomes are used in intracellular digestion; mitochondria are sites of cellular respiration, not photosynthesis; and, centrioles produce the spindle.
Which of the following statements correctly ex-plains the flow of energy through a food web?
Answer(s): E
At each level of the food web, there is a decline in available energy as organisms use the energy they acquired through eating. The energy is used for growth and development, feeding, and reproduction. This is the reason why food webs do not have, say, 10 or 12 trophic levels there simply is not enough energy available. Energy does not cycle through food webs like certain elements or compounds. It comes in from the sun, is used to build complex molecules, and changed in form entirely.
An animal cell is placed in a solution containing a solute concentration greater than that of the cell's cytoplasm. The cell membrane is permeable to water but not to the solutes. What is likely to happen to the cell?
If the cell is not permeable to the solutes, only water can move freely back and forth. A higher solute concentration out-side the cell will pull water from the cell cytoplasm out and cause the cell to shrivel up.
The two sides of the U-tube shown below are separated by a semi-permeable membrane that allows water but not sucrose to pass through it. Side A is filled with a 10% sucrose solution, and Side B is filled with a 15% sucrose solution. After the system reaches equilibrium, which of the following will have occurred?
Answer(s): B
Because Side B has the higher sucrose concentration and because the membrane is impermeable to the sugar, water will move from Side A to "dilute" the sugar on Side B, causing the water level of Side B to rise up. At equilibrium, the concentrations of sucrose on both sides will be equal.
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