Which lipid can be identified by its isoprene units?
a. fats
b. steroids
c. carotenoids
d. amino acids
e. phospholipids
c
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0.2 mls of a 10-4 dilution of a virus preparation yields 90 plaques. What is the number of PFU per ml in the undiluted virus preparation?
A. 9.0 × 108 B. 4.5 × 106 C. 4.5 × 107 D. 9.0 × 105
Unlike members of the Bacteria, most archaeons have linear chromosomes with multiple origins of replication.
Answer the following statement true (T) or false (F)
Some compounds are themselves not carcinogens, but their metabolic activity on the compound produces intermediates that are carcinogenic. This process is known as
A) precarcinogenesis. B) carcinogen activation. C) metabolic carcinogenesis. D) plasminogen activation. E) DNA mutagenesis.
Memory cells do not require B cell receptors
Indicate whether the statement is true or false