While a backhoe operator is helping to clear land that will be used for a poultry farm, the equipment opens up a hidden chamber in which old electrical transformers have been buried. The operator knows that transformers contain PCBs. Why should this
person warn the owners of the land?
What will be an ideal response?
PCBs can cause cancer and are nondegradable, posing a threat to workers at the poultry farm and to consumers of the chickens and eggs produced there.
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Where in the eudicot plant root would you expect to find vascular tissue?
A. in the center B. near the edge C. between the ground and dermal tissue D. scattered in the root E. parallel to the edge
In an aqueous environment, the phospholipids of a membrane ____
a. are arranged in a single layer b. are arranged in a bilayer with the polar heads of each layer located at the surface c. are arranged in a bilayer with the fatty acid tails located at the surface d. are arranged in a bilayer but the phospholipids have no specific orientation e. dissolve
Both chemiosmosis and photophosphorylation involve (electron/proton/hydroxyl) gradients.
Fill in the blank(s) with the appropriate word(s).
All bacterial cells have
A) Fimbriae B) Capsules C) A chromosome D) Flagella E) Endospores