This is the second homework for this marking period. Recall that all homeworks (3 or 4) will be counted as one test in the average that determines your grade. Don't guess..look up the answers. Do yourself proud..get yourself to the standard of Outstanding.
Question #1: Which structure is the boundry between a living cell and its environment?
1) cell membrane
2) cytoplasm
3) vacuole
4) ribosome
Question #2: Which of the following would be LEAST affected by defective receptor proteins on a cell membrane/
1) homeostasis
2) muscle activity
3) nerve signals
4) diffusion
Question #3: A biologist diluted a blood sample with distilled water. While observing the sample with a microscope, she noted that the red blood cells had burst. This bursting is most likely the result of which process?
1) staining
2) diffusion
3) digestion
4) active transport
Question #4: Amino acids tend to diffuse from a blood capillary to the adjacent cell because
1) this is the only direction they can move
2) the brain directs the movement into cells
3) the cell needs the amino acids to make protein
4) the concentration of amino acids is lower in
the cell
Question #5: Nutrients that are not used as building blocks for the cell may be broken down to release the energy stored in their chemical bonds, this process, whcih provides cells with energy, is called
1) chemical synthesis
2) cell respiration
3) digestion
4) homeostasis
Question #6: Cytoplasm in a plant cell will shrink if the cell is
1) placed in a concentrated salt solution
2) kept warm and moist and in medium light
3) placed in distilled water
4) exposed to a different concentration of
nitrogen gas
question #7: A high concentration of calcium salts is normally found within the cytoplasm of a certain protozoan, while the surrounding environment contains a lower concentration of the calcium salts. The higher concentration in the protozoan is most probably the result of
1) diffusion
2) excretion
3) active transport
4) cellular dehydration
Question #8: After a cookie has been eaten, sugar molecules enter the bloodstream by the process of
1) active transport
2) diffusion
3) excretion
4) cellular respiration
Question #9: One reason a fish that lives in the ocean may have trouble living in a freshwater lake is that
1) there are more carnivores in freshwater
habitats
2) salt water holds more dissolved nitrogen that
freshwater
3) more photosynthesis occurs in freshwater than
in salt water
4) water concentration in the fish is affected by
salt levels in its environment
Question #10: People sometimes use large quantities of salt to preserve food. The salt kills bacteria that would otherwise cause the food to spoil. Based on what you know about diffusion, explain how the salt acts as a preservative.
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