The ID50 is
A) a measure of pathogenicity.
B) the dose that will cause an infection in 50 percent of the test population.
C) the dose that will kill some of the test population.
D) the dose that will cause an infection in some of the test population.
E) the dose that will kill 50 percent of the test population.
B
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A class of gene in multicellular eukaryotes called piwi (the name derives from a Drosophila gene called P-element induced wimpy testis) encodes regulatory proteins involved in maintaining incomplete differentiation and stable cell division in germ-
line and stem cells. PIWI proteins represent a clade within a larger familythat includes ______________ proteins. A. ENCODE B. Argonaute C. Dicer D. Drosha
In eukaryotic cells, the enzymes involved in the tricarboxylic acid cycle (Kreb's cycle) are located
A. in the cristae. B. in the outer mitochondrial membrane. C. in the inner mitochondrial membrane. D. in the matrix of the mitochondria. E. in the cytoplasm.
The phase of mitosis in which the nuclear envelope breaks into small pieces is
A. D, which is anaphase. B. B, which is prometaphase. C. B, which is prophase. D. C, which is metaphase. E. C, which is telophase.
A new operon is discovered in a bacterium. The control of this operon is affected by a protein that is
made by another gene, and is made in an active form that binds to the DNA near the operon to prevent transcription. This is an example of __________ control. a. positive b. negative c. activational d. repressing e. inducing