All of the following are true about Shiga toxins EXCEPT:
A. It is a holotoxin composed from one A subunit and five B subunits
B. It is a preformed toxin composed from one A subunit and five B subunits
C. Upon its activation, the B subunits bind to a host cell and facilitate transfer of the A subunit into the cell. The a subunit disrupt protein synthesis
D. It is also produced by some pathogenic Escherichia coli
Ans: B. It is a preformed toxin composed from one A subunit and five B subunits
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Which of the following evidence most strongly supports the common origin of all life on Earth? All organisms _____
A) require energy B) use essentially the same genetic code C) reproduce D) show heritable variation E) evolve
In genetic mapping, a map unit is defined as:
A. the distance between two genes. B. 1 millimeter. C. 1 micrometer. D. the distance between genes resulting in 1% recombination. E. the distance between genes resulting in 50% recombination.
You have type A blood (genotype IAi). Who can you donate blood to in an emergency?
a. type O only b. type AB only c. type A only d. types A and B, not O e. types A and AB
The oxygen released in photosynthesis comes from ____.
A. carbon dioxide
B. glucose
C. ribulose bisphosphate
D. water
E. atmospheric oxygen