Which of the following is an internal defense in the body’s innate immune system?
a. Antibodies
b. B cells
c. Memory response
d. Natural killer cells
d. Natural killer cells
Natural killer cells are part of the internal defense in the body’s innate immune system.
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In a series of cotransformation experiments, DNA fragments from x+y+z+ donor bacteria were used to transform xyz recipient bacteria
The following transformation phenotypes were observed in the recipient cells: xy+z xyz+ x+y+z x+yz+ What does this imply about the gene order of x, y, and z?
Accidents during meiosis that can result in trisomies and monosomies are called
a. nondisjunctions. b. inversions. c. reciprocal translocations. d. recombinations. e. acrocentricities.
Which is a direct result of cleavage?
A) formation of the nervous system B) formation of the notochord C) division of cells D) segmentation
Most human adults are lactose intolerant. People with lactose intolerance produce insufficient amounts of _______.
A. vitamins B. lactose C. saliva D. the enzyme lactase