A hormone released in the small intestine that stimulates the pancreas to release digestive enzymes and the gallbladder to release bile is known as ________
A) gastrin
B) secretin
C) cholecystokinin
D) vasoactive intestinal peptide
C
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Several species of sea urchins may inhabit the same tide pool and their reproductive periods overlap. Although they practice external fertilization, they seldom interbreed because eggs produce chemicals that are only attractive to sperm of their own species. This is an example of a _________ barrier that _______________.
A. prezygotic; causes geographic isolation B. prezygotic; causes temporal isolation C. prezygotic; prevents gamete fusion D. postzygotic; prevents zygote fusion E. postzygotic; causes hybrid infertility
The letter "D" in the above figure represents
the a. style. b. ovary. c. stigma. d. anther. e. filament.
The teeth designated by the letter "B" in the
above figure are called a. canines. b. premolars. c. incisors. d. molars. e. all of these
The order of the structural genes in the lac operon is
A) 5'-lacY-lacZ-lacA-3'. B) 3'-lacZ-lacY-lacA-5'. C) 5'-lacZ-lacY-lacA-3'. D) 3'-lacY-lacA-lacZ-5'. E) 5'-lacA-lacY-lacZ-3'.