The existence of the Oort cloud cannot be confirmed observationally from Earth because the objects are too small and distant
a. True
b. False
Indicate whether the statement is true or false
True
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T cells recognize antigens with their
A) antibodies. B) leukocidins. C) M proteins. D) T cell receptors.
Which of the following conclusions can be made if two identical insertion sequences are identified in separate locations on a chromosome?
A. The insertion sequence was transferred via simple transposition. B. The insertion sequence was a "cut-and-paste" transposon. C. A mutation occurred during transposition of the insertion sequence. D. The insertion sequence was transferred via replicative transposition.
The first organism produced as a transgenic organism was
A. a virus. B. corn. C. bread yeast. D. Dolly, the cloned sheep. E. a bacterium.
Sodium chloride (NaCl) in water can be described by
any EXCEPT which of the following? a. Na+ and Cl– form b. a solute c. ionized d. forms a hydrophobic interaction e. dissolved