A B cell CstF-64 mutant will likely:
A. constitutively secrete IgM antibodies.
B. selectively remove the VDJ region from IgM antibodies.
C. cut IgM pre-mRNA at every available 3'-end cleavage site.
D. undergo IgM pre-mRNA splicing between the heavy chain exons and the membrane anchoring exon.
D
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Experimenters replaced the statoliths in a crayfish statocyst with iron filings and then held a magnet above the animal. Based on your knowledge of the function of statoliths, what would they observe?
A. The crayfish stayed upright. B. The crayfish lay on its side. C. The crayfish turned upside down. D. The crayfish attempted to escape by rapidly swimming backwards. E. None of these choices are correct.
When experimenting with Streptococcus pneumoniae in the 1920s, Griffith concluded that some substance from the dead S strain bacteria passed to the R strain bacteria, imparting virulence and the ability to form a capsule. Avery and others continued the search for the substance that "transformed" the R strain into the S strain.Hypothesis I:Genetic material or "transforming substance" is protein.Hypothesis II:Genetic material or "transforming substance" is RNA.Hypothesis III:Genetic material or "transforming substance" is DNA.In an experiment, neither heat-killed R strain nor heat-killed S strain killed the mice. This finding
A. supports Hypothesis I. B. supports Hypothesis II. C. supports Hypothesis III. D. rejects Hypothesis I only. E. rejects Hypothesis II only. F. rejects Hypothesis III only. G. does not support or provide information to reject any of these hypotheses.
Regarding the evolutionary history of organisms,
A. in most cases it is impossible to determine a species' close evolutionary relatives. B. as new information is discovered, our understanding of the evolutionary history of organisms will change. C. there are few techniques that allow us to develop evolutionary histories for organisms. D. All of these answers are true.
________ are stramenopiles that commonly are found decomposing dead animals in freshwater habitats
A) Brown algae B) Water molds C) Cellular slime molds D) Plasmodial slime molds