Which hormone prevents a seed released in the fall from germinating immediately?
A) auxins
B) abscisic acid (ABA)
C) gibberellins
D) ethylene
Answer: B
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Ribozymes
A. are complexes of ribosomes and RNA. B. are self-catalytic RNA. C. suggest that nucleic acids evolved before proteins. D. are enzymes that degrade RNA and therefore have potential for clinical applications. E. are self-catalytic RNA AND suggest that nucleic acids evolved before proteins.
Which of the following is NOT accurate regarding the Bicoid protein?
A. it is a morphogen B. it is a transcription factor C. it activates genes when it reaches a concentration threshold D. if affects the posterior part of the Drosophila embryo E. it activates gap genes
Researchers exposed Caenorhabditis elegans to bacteria, which caused the parasite to use sexual reproduction instead of asexual reproduction. What advantage did C. elegans have in using sexual reproduction over asexual reproduction?
A. The offspring were unique, giving the roundworms a better chance of survival. B. The offspring were identical, giving the roundworms a better chance for survival. C. The offspring wer identical, giving the bacteria a greater chance to kill the entire population. D. The offspring were unique, giving the roundworms a more energy-conserving type of reproduction. E. All of the answer choices are correct.
An astounding 20 percent of the world's freshwater runoff comes from what single source?
A) the Mediterranean Sea B) the Amazon River C) the Great Lakes D) aquifer discharge E) icebergs