During photolysis water will dissociate into hydrogen ions and ________
a. nitrogen
b. sulfur
c. hydroxide
d. oxygen
e. carbon
d
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Genomic DNA sequences seem to support the idea that the first eukaryotic cell arose from within the ________ lineage.
A. bacterial B. last universal common ancestor (LUCA) C. viral D. archaeal
During bacterial conjugation, interrupted matings yielded the following information: leu 10 minutes, arg 8 minutes, str 15 minutes, and amp 12 minutes. Based on this information, the order of the genes, beginning at the origin, is
A) amp-arg-leu-str. B) str-amp-leu-arg. C) leu-arg-str-amp. D) arg-amp-leu-str. E) arg-leu-amp-str.
Which of the following statements is (are)
INCORRECT about ricin?
a. Ricin is a naturally occurring toxic protein. b. The use of ricin as a weapon is banned by the Geneva Convention. c. Ricin does not have an antidote. d. Ricin is obtained from the castor-oil plant. e. Ricin stops protein synthesis by blocking the activity of DNA
Which of the following best describes mollusks?
A) They have radial body symmetry and a soft body always covered with a shell. B) They are bilaterally symmetrical and have a soft body always covered with a shell. C) They have radial body symmetry and a soft body sometimes covered with a shell. D) They are bilaterally symmetrical and have a soft body sometimes covered with a shell.