In the 2009 article "Genomic Footprints of a Cryptic Plastic Endosymbiosis in Diatoms" (Science 324: 1724-26), Moustafa et al. described their search for possible gene transfer from organelles to the nucleus in diatom genomes
They assumed that diatomic plastids came from red algae. However, they found that most were from green algae. Which is most likely? A) Diatoms once had green algal endosymbionts.
B) Red algae had green algal endosymbionts.
C) Red plastids were replaced by green plastids.
D) Cyanobacteria imported green plastid genes.
E) All red algal genes mutated to green algal genes.
A
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During the inflammatory response, which type of chemical is secreted by mast cells?
1.Antibodies 2.Chemokines 3.Cytokines 4.Histamines
In order for signal transduction to work properly in plants, the
A. relay proteins need to amplify the signal and convert it into one that will alter the cellular machinery. B. correct hormone needs to bind to the appropriate receptor in order to enter the cell. C. gene expression must change to produce the appropriate cellular process. D. All of the answer choices are correct.
Detritivores are
a. bacteria. b. plants. c. fungi. d. animals. e. both bacteria and fungi.
Cinnabar eyes is a sex-linked, recessive characteristic in fruit flies. If a female having cinnabar eyes is crossed with a wild-type male, what percentage of the F1 males will have cinnabar eyes?
A) 0% B) 25% C) 50% D) 100%