Which of the following statements about El Niño are true?
_____ Occurrence of El Niño is irregular and unpredictable.
_____ The immediate effect of El Niño is a weakening in the east-to-west trade winds
_____ Weakening in the trade winds results in more upwelling along the Peru-Ecuador coast.
_____ El Niño results in the movement of weather systems from the western Pacific eastward.
_____ El Niño events in the Pacific can influence weather as far away as Africa.
__X__ Occurrence of El Niño is irregular and unpredictable.
__X__ The immediate effect of El Niño is a weakening in the east-to-west trade winds
_____ Weakening in the trade winds results in more upwelling along the Peru-Ecuador coast.
__X__ El Niño results in the movement of weather systems from the western Pacific eastward.
__X__ El Niño events in the Pacific can influence weather as far away as Africa.
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Oral rehydration solutions that contain both salt and glucose are highly effective in treating severe dehydration caused by diarrhea and vomiting. However, glucose or salt alone are not effective. Why?
A. Sodium transport and glucose transport are coupled in the small intestine so that glucose accelerates absorption of salt and water. B. Water alone rushes through the digestive tract too quickly to be absorbed by the body tissues. C. ATP is required to transport sodium unless glucose is available for cotransport. D. Glucose without sodium is broken down too quickly in the mouth by saliva.
Oxygen released by _____ accumulated in the atmosphere and produced the ozone layer
a. archaeans b. aerobic bacteria c. cyanobacteria d. early eukaryotes
A Barr body exists for the purpose of _____
a. gene dosage compensation b. insuring fertilization c. blocking the activity of the Y chromosome d. turning on the SRY gene e. activating master genes
Actin filaments may form each of the following except
A) 3D filament networks (gels). B) contractile bundles. C) branched networks. D) bundles of parallel filaments. E) axonemes containing doublet microfilaments.