Telomerase is an enzyme that unwinds DNA during DNA replication.
Answer the following statement true (T) or false (F)
False
Telomerase is an enzyme that builds telomeres on the ends of DNA strands. DNA helicase is the enzyme that unwinds the DNA strand during replication.
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Choose the true statements about molecular clocks.
_____ All molecular clocks tick at the same rate. _____ Molecular clocks can be calibrated using fossil evidence. _____ The rate of a molecular clock for a given DNA character might vary depending on how constrained the character is by natural selection. _____ Ultimately, all molecular clocks depend on the rate of DNA mutation and DNA repair mechanisms.
Speciation caused by a change in the course of
a river is an example of ____ speciation. a. divergent b. parapatric c. allopatric d. convergent e. sympatric
Which of the following tissue types will produce root hairs within the zone of maturation?
A. endodermis B. cortex C. vascular tissue D. epidermis
Which one of the following statements about diplomonads and parabasilids is false?
A. Some members are parasitic, but some also engage in mutualism. B. Both groups are flagellated protists. C. Absence of mitochondria in these groups is an ancestral trait. D. Diplomonads and parabasilids belong to different clades