Differences in domesticated animals over relatively short periods of time most likely occur through:
A. natural selection
B. artificial selection
C. adaptation
D. experimental selection
E. evolution
B. artificial selection
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Which of the following is not correct concerning the initiation of bacterial replication?
A. It involves a region of the DNA called oriC B. DNA proteins bind to the DNA to begin separation of the strands C. The strands are initially separated at GC-rich regions of DNA D. Following initial separation, DNA helicase enzymes continue to unwrap the DNA
DDT and PCBs are no longer legally used anywhere in the U.S
Indicate whether the statement is true or false
The primary function of the leaf structure labeled 5 in Figure 9-1 is:
a. food storage.
b. photosynthesis.
c. water transportation.
d. gas exchange.
e. nutrient absorption.
Which chemical, contained in the granules of basophils, helps prevent blood clot formation?
a. histamine b. leukotrienes c. prostaglandins d. heparin
e. SRS-A