The development of a blood substitute would be welcomed for all of the following reasons EXCEPT which one?
A) Human blood may carry and transmit infectious agents.
B) Human blood storage requires refrigeration, which might not be available in developing countries.
C) The supply of donated human blood generally cannot keep up with the demand.
D) Transfused blood rarely persists for more than a few days in the recipient.
E) Typing and cross-matching are necessary with human blood, and the right type may not be available.
D
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The ________ is a large organ in the abdominal cavity that specializes in filtering the blood and trapping bloodborne microorganisms and antigens.
Fill in the blank(s) with the appropriate word(s).
Which of the following best describes coevolution?
a. A change in one species has no effect on the other species. b. A change in one species has an effect on the other species. c. Neither of the two species change. d. Both species change, but independently of each other.
There are no microorganisms that can cross the transplacental barrier, so fetuses are protected until birth.
a. true b. false
You have joined a lab studying DNA replication in E. coli. The graduate student you are working with has identified a mutation in primase that makes primase very inefficient. Your project is to characterize the cells with this mutation. Predict the defects you would most likely see in the mutant E. coli cells.
A. inefficient Okazaki fragment joining B. a longer total time to replicate DNA C. a delay in the unwinding of DNA D. a delay in DNA polymerase beginning synthesis E. rapid lagging-strand synthesis but slow leading-strand synthesis