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

Biology & Microbiology

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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

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Keratinase has the greatest effect on the ________.

A. genital system B. urinary system C. respiratory system D. skin E. gastrointestinal system

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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

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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

Biology & Microbiology