An Rh-positive baby can cause an Rh-negative mother to produce antibodies against the Rh antigen. When is this a problem?
What will be an ideal response?
This is a problem during a subsequent pregnancy, when the mother's anti-Rh antibodies cross the placenta and enter the blood of the fetus. If the second fetus is Rh-positive, the anti-Rh antibodies can destroy the fetal red blood cells, causing stillbirth or hemolytic disease of the newborn.
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The primary function of the loop of Henle is:
A. to generate a concentration gradient between the inner medulla and outer cortex. B. to dilute the filtrate passing through the loop. C. to concentrate the filtrate passing through the loop. D. selective reabsorption of glucose and other solutes into the bloodstream. E. active secretion of other wastes from the bloodstream.
Influenza virus can exhibit constant mutation of viral glycoproteins, called antigenic ________, or alternatively antigenic ________, which is a more serious phenomenon caused by the exchange of a viral gene with that of another influenza virus strain.
A. drift; exchange B. exchange; drift C. shift; drift D. drift; shift
Some athletes abuse anabolic steroids to gain greater muscle mass. What are some long-term harmful side effects of using anabolic steroids?
A. impotence B. shrunken testicles C. infertility D. growth of breast tissue E. All of the answer choices are correct.
What is a chain of round bacteria called?
a. bacilli b. spirilla c. diplococci d. streptococci e. streptobacilli