The molecules in a solid lump of sugar do not move.
a. true
b. false
b. false
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What is the purpose of a selectable marker such as the antibiotic-resistance gene ampR?
A. Selectable markers allow a researcher to identify cells that have incorporated the recombinant plasmid. B. Selectable markers produce antibiotics, which kill cells that have not incorporated recombinant plasmid. C. Selectable markers prevent cells that have incorporated one plasmid from incorporating another. D. Selectable markers allow a researcher to identify the recombinant plasmid. E. Selectable markers are only effective in viral vectors.
The complexity of microRNA function is that
A) microRNAs can be rRNA, mRNA, or tRNA. B) they range in size from 10 to 10,000 bases. C) a microRNA type can bind several mRNAs, and an mRNA can bind several microRNAs. D) it can be acetylated, phosphorylated, or methylated.
Which are structures formed from the neural crest? (Check all that apply.)
_____ a gill chamber of primitive chordates _____ blastopores _____ sensory neurons of the dorsal root ganglia _____ Schwann cells _____ olfactory and hearing organs
Plasma cells release ________ that attach to an invading microbe, marking it for destruction.
A. interleukin-2 B. perforin molecules C. histamine D. antibodies