Diapedesis is the
A. plugging of broken vessels to stop bleeding.
B. migration of white blood cells from the blood out to the tissues.
C. loss of blood due to hemorrhaging.
D. production of white blood cells, red blood cells, and platelets.
E. production of only red blood cells.
Answer: B
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Which of the following mechanisms are causal explanations for bird song?
A. Young males learned their song from their fathers. B. Songs are used by males to attract a mate. C. The ritualization of the vocalization became species specific. D. Air passing through a bird's specialized singing organ, the syrinx, vibrates the surrounding organs.
Which of the following is the fundamental organizational unit of structure and function in living things?
a. Atoms b. Molecules c. Cells d. Organelles
An antagonist to a receptor decreases the number of messengers bound to the receptor.
a. true b. false
Carbon-14 is often used for carbon dating, where scientists measure the rate of carbon-14 decay to determine the age of items. Carbon-14 contains six protons and eight neutrons
During the process of carbon-14 decay, one of its eight neutrons becomes a proton and an electron is emitted. Which of the following is the best explanation of what has occurred? A) An ionic bond has formed. B) The resulting atom is now a different element because the number of protons has changed. C) The resulting atom has a more stable nucleus. D) The resulting atom is still carbon-14.