Aspergillus sydowii spores land in the Caribbean Sea
and infect__________.
a. salmon.
b. red snapper.
c. sea urchins.
d. sea fans.
e. all of these.
Answer: d
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DNA polymerase III can synthesize a new strand of DNA at the rate of 300 nucleotides per minute
Indicate whether the statement is true or false
Dead and injured white blood cells are removed from circulation by the
A) spleen. B) tonsils. C) red bone marrow. D) kidney. E) thymus.
In the nematode C. elegans, ced-9 prevents apoptosis in a normal cell in which of the following ways?
A) It prevents the caspase activity of ced-3 and ced-4. B) Ced-9 remains inactive until it is signaled by ced-3 and other caspases. C) Ced-9 cleaves to produce ced-3 and ced-4. D) Ced-9 prevents blebbing by its action on the cell membrane.
Which of the following is a common source of heavy metals introduced into natural ecosystems?
A) refuse from mining and smelting operations B) waste products of manufacturing processes C) fungicides D) by-products of burning of leaded fuels E) all of the above