Exotoxins are ________.
A. antiphagocytic factors
B. lipopolysaccharides
C. proteins secreted by living bacterial cells
D. secretions that always target nervous tissue
E. only released after a cell is damaged or lysed
Answer: C
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Which of the following are sequence motifs?
A. open reading frame B. hairpin structures C. transcription factors D. coding region E. All of the answer options are correct.
If the anticodon sequence of a(n) ____ is correct, a special enzyme will bind to it and "charge" it by
adding the correct amino acid to its 3' end.
a. pre-mRNA b. tRNA c. snRNA d. mRNA e. rRNA
It appears that early Homo sapiens ____
a. interbred with Australopithecus afarensis b. originated in Oregon c. interbred with Neanderthals d. migrated from North America to Africa e. never lived alongside Neanderthals
The spinal cord is enclosed by the vertebral column and layers of protective membranes. What are these membranes called?
A. Neural net B. Viscera C. Dorsal root D. Meninges E. White matter