In a population of 100 four-o'clock flowers there are 40 red-flowered plants (CRCR), 38 pink-flowered plants (CRCW), and 22 white-flowered plants (CWCW). What is the frequency of the CW allele in this population?
A. 0.32 or 32%
B. 0.6 or 60%
C. 0.41 or 41%
D. 0.09 or 9%
E. 0.52 or 52%
C. 0.41 or 41%
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In multicellular organisms, the mechanism most directly responsible for directing development and maintaining homeostasis is gene
A. regulation. B. duplication. C. deletion. D. mutation.
In muscle contraction, the breaking of the cross-bridge between actin and myosin is caused by ____
a. hydrolysis of ATP into ADP plus Pi b. formation of ATP from ADP and Pi c. release of Pi from the myosin head d. binding of a new ATP to the myosin head e. return of myosin to a high-energy state
Lancelets possess which of the following as adults?
a. notochord b. gill slits c. nerve cord d. segmented muscles e. all of these
Which of the following statements about bacteria is false?
a. A small percentage of bacteria are pathogenic. b. Some bacteria can photosynthesize. c. Bacteria are important decomposers. d. Bacteria are not cellular and are sometimes not classified as life forms. e. Bacteria convert atmospheric nitrogen into ammonia and then nitrates that can be used by plants.