After an active cytotoxic T cell binds to an
ailing cell, it releases toxins that
a. poke holes in the cell and cause it to die.
b. bind to the cell and prevent it from harming
other self cells.
c. attract macrophages to the cell.
d. poke holes in the cell and cause it to die,
and bind to the cell and prevent it from
harming other self cells.
e. cause all of these to occur
A
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If a testcross for two different traits produces more nonrecombinant than recombinant offspring, then the alleles for the two traits
A. are dominant. B. are on the same chromosome. C. are on different chromosomes. D. are epistatic. E. are both dominant and on the same chromosome.
Mammalian monotremes are limited to the Australian region
a. True b. False
Does either of the insulin chains contain beta sheets?
a. yes b. no
Some mammals, like the kangaroo rat of the desert, have extremely long loops of Henle in their kidneys. What purpose must this serve?
What will be an ideal response?