In eukaryotes, pre-mRNA processing may involve all of the following except
A. removal of exons from the pre-mRNA.
B. addition of a 5' cap.
C. addition of a 3' poly-A tail
D. pre-mRNA splicing by the spliceosome.
A. removal of exons from the pre-mRNA.
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If the pond organisms are larvae, rather than adults, Sarah should expect them to have all of the following structures, EXCEPT _____
A) antennae B) an open circulatory system C) an exoskeleton of chitin D) complex eyes E) sex organs
The function of BMP4 is to ____________ while the function of gremlin is to __________ BMP4.
A. cause apoptosis (cell death); inhibit. B. cause mitosis; enhance production of. C. inhibit growth; enhance. D. enhance growth; enhance. E. cause apoptosis (cell death); enhance.
The symptoms and signs of Friedreich's ataxia
include all of the following EXCEPT a. loss of coordination. b. iron buildup in mitochondria. c. serious heart problems. d. liver failure. e. weak muscles
Which statement is not true about chronic persistent viral infections?
A) May involve integration of the virus into the host cell DNA to form a provirus. B) May involve periods of flare-up where the virus is actively replicating alternating with periods of dormancy. C) Small numbers of virions may be produced and released from host cells during the quiet periods. D) The immune system fails to clear the infection. E) A period of quiet infection where the host is asymptomatic is followed by a period of active viral replication.