Cytotoxic T lymphocytes insert (CD95/lectin/perforin) into the membranes of the cells they target as a first step in killing
What will be an ideal response?
perforin
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The process that probably accounts for most changes in the mix of alleles in a gene pool is
a. cloning. b. mitosis. c. meiosis. d. natural selection. e. genetic drift
Meissner corpuscles are sensitive to deep pressure in the skin
____________________ Indicate whether the statement is true or false.
Chromosome number is reduced during meiosis because the process consists of
a. two cell divisions without any chromosome replication. b. a single cell division without any chromosome replication. c. two cell divisions in which half of the chromosomes are destroyed. d. two cell divisions and only a single round of chromosome replication. e. four cell divisions with no chromosome replication.
Four __________ glands make a hormone that acts on bone and kidney cells and raises blood calcium level.
Fill in the blank(s) with the appropriate word(s).