Which of the following statements about staphylococcal enterotoxin is FALSE?
A) It causes vomiting.
B) It causes diarrhea.
C) It is an exotoxin.
D) It is produced by Staphylococcus aureus growing in the host's intestines.
E) It is a superantigen.
D
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SMAD4 is a tumor suppressor gene located on chromosome 18 that is known to be homozygously deleted in human lung cancer
If you were to perform comparative genomic hybridization with tissue from a lung cancer patient with a homozygous negative SMAD4 tumor, what ratio of green to red fluorescence would you expect? A. A ratio of 1 on all of chromosome 18 B. A ratio of 2 on the part of chromosome 18 containing the SMAD4 gene, with a value of 1 on the remainder of the chromosome. C. A ratio of 0 on all of chromosome 18 D. A ratio of 0 on the part of chromosome 18 containing the SMAD4 gene, with a value of 1 on the remainder of the chromosome E. A ratio of 1 on the part of chromosome 18 containing the SMAD4 gene, with a value of 0 on the remainder of the chromosome. F. A ratio of 0.5 on the part of chromosome 18 containing the SMAD gene, with a value of 1 on the remainder of the chromosome.
Which of the following cells are alive at
maturity?
a. sieve tube members b. vessel members c. tracheids d. fibers e. sclerids
The ultracentriguge is an important piece of lab equipment frequently used by cell biologists. What are some applications for the ultracentrifuge? choose one or more
A.) determining whether prokaryotic cells are bacteria or archaea B.) separating isomers of 6-carbon sugars from each other C.) separating different cellular organelles from each other D.) determining the sequence of (linear order of) monomers in a macromolecular polymer
Effects a virus can have on a host cell
What will be an ideal response?