Describe how you would care for and put away your compound light microscope at the end of the lab.
What will be an ideal response?
Turn off the light source. Rotate objective so that the lowest power objective is in the light path. Remove slide from the stage. Clean all lenses with lens tissue. Fold power cord onto itself and secure with rubber band or strap. If supplied, place dust cover over microscope. Return to cabinet, holding onto the microscope arm with one hand while supporting the microscope base with the other.
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Why is it necessary to take special safety precautions when using radioactivity?
A. Radioactive substances decay. B. Radioactive substances will perforate plasma membranes. C. Radioactive substances will ionize cells. D. Radioactive substances have the potential to cause damage to living cells.
Which of the following is not a harmful practice of modern farming?
A. polyculture planting B. heavy use of fertilizers C. heavy use of pesticides and herbicides D. increased fuel consumption E. generous irrigation
________ are soil dwellers; ________ are mostly marine; and ________ mostly inhabit fresh water
A) Earthworms; leeches; annelids B) Earthworms; leeches; polychaetes C) Earthworms; polychaetes; leeches D) Polychaetes; earthworms; leeches
Changes that have occurred in living organisms over the past four billion years are due primarily to
A. extinction of species. B. continental drift. C. changes in geological periods. D. interaction of genetic changes and environmental changes. E. the change in the orbit of the moon, causing mass extinction due to volcanic activity.