Why are people with blood type O called "universal donors", while people with blood type AB called "universal recipients"?
What will be an ideal response?
People with blood type O have no carbohydrates on the surface of their red blood cells. As such, anyone can receive their blood without their bodies attacking the red blood cells - the lack of carbohydrates prevents any reactions against these cells. On the other hand, a person with blood type AB can receive blood from anyone, because their body will not attack any types of blood since it recognizes both A and B carbohydrates.
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Why are viruses not considered to be living organisms?
What will be an ideal response?
Salps and amphipods of the genus Phronima have a commensal symbiosis
Indicate whether the statement is true or false
During pregnancy, a maternal antibody transported across the placenta to the fetal bloodstream can cause a problem if
the mother ____. a. has passed on any teratogens b. and baby have different Rh factors c. is producing HCG d. smokes during pregnancy e. uses alcohol during pregnancy
During the second half of an action potential, ____
a. potassium ions are leaving the cell b. the Na+-K+ pump is off c. sodium ions are moving into the cell d. the cell is approaching threshold potential e. the membrane potential is becoming more positive