Which of the following is NOT a way plants affect life on Earth?
A. Top of food webs
B. Habitat for microscopic and macroscopic organisms
C. Fuel source directly as nutrition and indirectly as wood and coal
D. Prevent erosion of landscape by rooting into soil and other substrates
E. Provide oxygen that forms the ozone layer
Answer: A. Top of food webs
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Injection of a single antigen usually results in production of
A. antibody to a single epitope. B. an antibody that recognizes several epitopes. C. additional antigen. D. a number of antibodies each recognizing a different epitope.
A procedure that divides organisms into two or more groups depending on their individual reactions to the same staining procedure is referred to as ________ staining.
Fill in the blank(s) with the appropriate word(s).
The U.S. Food and Drug Administration warns children, mothers and potential mothers to avoid eating tuna because of high mercury levels. A typical can of albacore tuna contains about 4 times the amount of mercury that a healthy, average-sized adult may safely consume in a day. Do you think cans of tuna should carry labels warning of mercury content?
1.Yes; we can’t risk having children or mothers negatively affected by mercury poisoning. 2.No; the FDA advisory about mercury is enough warning.
What does a replication bubble represent in unidirectional replication? In bidirectional replication?
What will be an ideal response?