What mechanisms do natural killer cells use to destroy body cells that have been infected by cancer or a virus?
What will be an ideal response?
They open up large holes in the membrane of the infected cells, destroying the cells. In addition, they secrete enzymes that break down the cell membranes.
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Endotherms usually, but don't always, maintain a _____ body temperature that is _____ than that of the environment
A. constant; higher B. constant; lower C. constant; identical to D. fluctuating; higher E. fluctuating; identical to
In pea plants, the allele for purple flowers (P) is dominant to the allele for white flowers (p). In a cross between a purple-flowered plant and a white-flowered plant, all 73 of the offspring plants had purple flowers
Which cross would provide such results? A) pp × pp B) Pp × Pp C) PP × PP D) PP × pp
Refer t o the figure. Initially, in terms of tonicity, the solution in side A with respect to the solution in side B is _____
A) hypotonic B) isotonic C) saturated D) hypertonic
About half of all flowering plant species, including many important crop plants, belong to which category of chromosomes?
a. euploids b. haploids c. aneuploids d. polyploids