Natural killer cells can kill infected or abnormal cells by the release of ________, which form pores in the target cell's membrane.
A) interferons
B) fragmentins
C) perforins
D) antibodies
E) complement proteins
Ans: C) perforins
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The octopus and squid are cephalopods and are members of which group?
A. amphibians B. cnidarians C. mollusks D. echinoderms E. arthropods
Keratinase has the greatest effect on the ________.
A. genital system B. urinary system C. respiratory system D. skin E. gastrointestinal system
Some regions of a polypeptide may coil or fold back on themselves. This is called _____, and the coils or folds are held in place by _____.
A. secondary structure ... hydrogen bonds B. secondary structure ... peptide bonds C. tertiary structure ... hydrogen bonds D. primary structure ... covalent bonds E. tertiary structure ... covalent bonds
How would the kidneys respond to a decrease in blood pH caused by a high protein diet?
A) Increased HCO3- secretion and H+ reabsorption B) Increased secretion of both H+ and HCO3- C) Increased reabsorption of both H+ and HCO3- D) Increased H+ secretion and HCO3- reabsorption E) Increased production of renin and ADH