In what stage of the alternation of generations in flowering plants is a process that is analogous to the production of eggs by frogs carried out?
A. embryogenic stage
B. sporophyte stage
C. gametogentic stage
D. gametophyte stage
Answer: D
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True or false: Amino acids can be spontaneously generated in vitro, but only under anaerobic conditions
A. true B. false
Assuming geological evidence is accurate, life on Earth may have originated
a. 14 billion years ago. b. 4.6 billion years ago. c. 3.5 billion years ago. d. 2.1 billion years ago. e. 1.2 billion years ago.
A negative RNA virus must first
A. synthesize a negative RNA copy of its genome. B. synthesize a positive RNA copy of its genome. C. transcribe RNA polymerase. D. synthesize a DNA copy of its genome. E. transcribe reverse transcriptase.
The trend toward increased mobility of the world populations will probably lead to
A. increased allele frequency differences among populations. B. decreased allele frequency differences among populations. C. a decrease in mutation rate. D. no change in allele frequency differences among populations because of selection. E. none of these.