________ is an alternative method of research to experimentation based on ________
a. Observational research; no hypothesis
b. Perspective-based research; no hypothesis
c. Perspective-based research; personal perspectives
d. Observational research; frequently observed behaviors
d
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The ________ receptor is a ligand-gated channel that carries chloride ions.
Fill in the blank(s) with the appropriate word(s).
Using transgenic animal models has its limitations because
A) prokaryotic cells are generally better at producing human proteins. B) bacterial pathogens that affect humans do not affect animals. C) the level of gene expression is significantly higher in animals. D) researchers cannot control where a transgene inserts itself into a genome.
Which statements about the complement system of vertebrates are correct? (Check all that apply.)
_____ The complement system is a part of the immune system of vertebrates. _____ The complement system consists of approximately 30 different proteins that circulate in the plasma. _____ If these proteins encounter the cell wall of a bacteria or fungi they form aggregations and eventually produce a pore that leads to the destruction of the invading cells. _____ Although complement proteins attack invaders, they are not involved with histamine release. _____ The complement system produces antibodies to bind invading cells.
Life originated in the _____
Fill in the blank(s) with correct word