Gibberellins were discovered as a result of:
A. extractions of this hormone from plants
B. a fungal disease on rice
C. an application of the hormone accidentally
D. many years of experiments to isolate it from plants
E. discovery of its relationship to auxins
B. a fungal disease on rice
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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.
Prolactin stimulates mammary gland growth and development in mammals and regulates salt and water balance in freshwater fish Many scientists think that this wide range of functions indicates that prolactin _____
A) is a nonspecific hormone B) has a unique mechanism for eliciting its effects C) is an evolutionarily conserved hormone D) is derived from two separate sources E) interacts with many different receptor molecules
Which of the following zones has the highest productivity and biodiversity in the ocean?
a. neritic zone b. abyssal zone c. aphotic zone d. photic zone
The exchange of genetic material during crossing over causes which of the following?
A) genetic variation B) stasis C) heterozygosity D) homozygosity