What molecule is secreted by an NK cell that has detected an infected or malignant cell?

a. cytokine
b. granzyme
c. perforin
d. MHC I


c. perforin

Biology & Microbiology

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Botanically, the fibers in your cotton t-shirt are _____

a. angiosperm seeds d. fibers from pine needles b. gymnosperm seeds e. cellulose-rich hairs c. lignin fibers

Biology & Microbiology

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

____.

a. 0% b. 25% c. 50% d. 75%

e. 100%

Biology & Microbiology

The initial circumstance that led some to believe that Abraham Lincoln had Marfan syndrome was that ____ had the

disease. a. one of Lincoln’s descendants b. Lincoln’s sister c. a descendent of Lincoln’s great-great-grandfather d. DNA analysis on Lincoln’s skull determined that he e. Photographs of Lincoln provided physical evidence that he

Biology & Microbiology

How is osmolarity measured?

a. total solute plus solvent concentration in a solution b. total solute concentration in a solution c. ratio of solvent to solute in a solution d. total solvent concentration in a solution

Biology & Microbiology