New alleles in a population come about through ____
a. natural selection
b. genetic drift
c. gene flow
d. inheritance
e. mutations
ANSWER: e
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The____layer of the digestive tract in mammals is in direct contact with the lumen
a. mucosa b. muscularis c. submucosa d. serosa e. serosa and muscularis
Which of the following statements is (are) true?
a. The anterior pituitary gland is essentially nervous tissue. b. The anterior pituitary gland secretes only two hormones. c. The posterior pituitary gland is the master gland. d. The posterior pituitary gland only stores and releases hormones produced by the hypothalamus. e. All of these are true.
Which of the following accumulates sulfur granules inside the cell?
A. Green sulfur bacteria B. Cyanobacteria C. Purple sulfur bacteria D. None of the choices are correct.
The final reaction in blood clotting is
A. prothrombin ? thrombin. B. plasmin ? fibrin. C. platelets ? prothrombin activator. D. fibrinogen ? fibrin. E. fibrin ? thrombin.