Suppose a scientist wants to identify a gene in a particular plant species by transposon tagging, but he is initially stumped because he finds no active transposons
He hypothesizes, however, that he can introduce a transposon from another plant species. Why might this be possible?
transgenes (are active in most species/organisms)
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On a hot, dry day a plant closes its stomata
thereby conserving water. Which plant hormone is responsible for the closing of the stomata?
a. auxin b. gibberellin c. ethylene d. cytokinin e. abscisic acid
________ is the enzyme that hydrolyzes ________ in dairy products into glucose and galactose. Absence of the enzyme may cause cramps and diarrhea in a condition called ________
Fill in the blank with correct word.
The ________ is the respiratory center that appears to facilitate the transition between inspiration and expiration.
A) ventral respiratory group B) central pattern generator C) dorsal respiratory group D) pontine respiratory group E) medullary respiratory group
Which of the following is NOT used as evidence that mitochondria and chloroplasts may have arisen according to the endosymbiotic relationship?
a. They have their own membranes and are the same size as bacteria. b. They possess their own type of DNA different from that found in the nucleus. c. They can live an independent existence when isolated from a cell. d. They possess their own ribosomes.