A horseshoe-shaped crown of tentacles used by many invertebrates for feeding is called a
A. protostome.
B. rhizophore.
C. trochophore.
D. lophophore.
E. fimbrium.
Answer: D
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Which of the following enzymes is responsible for joining Okazaki fragments together?
A. ligase B. DNA polymerase C. primase D. helicase E. topoisomerase
During the light reaction water is oxidized to form oxygen. This process
A. yields low-energy electrons. B. yields high-energy electrons. C. is needed to replace the electron lost by P680 during the light reaction. D. yields low-energy electrons and is needed to replace the electron lost by P680 during the light reaction. E. yields high-energy electrons and is needed to replace the electron lost by P680 during the light reaction.
If a daughter expresses an X-linked recessive gene,
she inherited the trait from a. her mother. b. her father. c. both parents. d. neither parent. e. her grandmother.
All of the following were likely present on the primitive Earth during the evolution of self replicating molecules EXCEPT
A. amino acids and nucleotides B. nitrogen C. simple carbohydrates D. freestanding liquid water E. an O2 rich atmosphere