Molecules with a molecular mass less than 5000 daltons can become antigens when they bind to carrier molecules
Indicate whether the statement is true or false
TRUE
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Once a mother has been sensitized to the Rh factor,
A. she can be given RhoGAM in future pregnancies to prevent hemolytic disease of the newborn. B. only future Rh- fetuses are at risk. C. all other Rh+ fetuses are at risk. D. she can never again have a low risk pregnancy. E. None of the choices are correct.
________ describes an organism that can function in an aerobic or anaerobic environment.
Fill in the blank(s) with the appropriate word(s).
Pseudocoelomate nematodes lack a body cavity.
A. Correct, their pseudocoel does not allow for the development and expansion of organs. B. Incorrect, their body cavity is fully enclosed by ectoderm but is a functional body cavity. C. Correct, they are solid from the gut to the cuticle. D. Incorrect, although not fully enclosed by mesoderm the pseudocoel is a body cavity.
Researchers trying to cure a deadly virus have discovered that it can only infect cells that display specific carbohydrate chains on their exterior plasma membrane. An early drug trial incorporated an enzyme designed to digest all carbohydrates outside the cell. Researchers believed that without those carbohydrate markers, the virus would not be able to identify vulnerable cells. When tested, the drug caused massive tissue damage instead. What mistake did the researchers make?
a. They forgot that the primary component of plasma membranes is carbohydrates; the drug destroyed the cells’ membranes. b. Without their carbohydrate markers, the cells were identified by antibodies as being foreign and were destroyed. c. Carbohydrates attached to the plasma membrane also bind cells together; without them, the tissues fell apart. d. The enzymes released carbohydrates into the intercellular medium, allowing the virus to replicate faster.