Cytotoxic T cells destroy cancerous cells by
A. forming the membrane attack complex.
B. releasing vesicles containing perforin.
C. activating natural killer cells.
D. opsonization.
E. secreting cytokines.
B. releasing vesicles containing perforin.
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If tossing a standard six-sided die with each side numbered 1 through 6, what is the probability of throwing a 2 or a 4 or a 5?
a. 1/3 b. 1/6 c. 1/2 d. 1/18
Archaea ____
a. have cell walls composed of cellulose b. reproduce primarily sexually c. are more closely related to eukaryotes than bacteria d. are more closely related to bacteria than eukaryotes e. have mitochondria
The centromere is a region in which
A) chromatids remain attached to one another until anaphase. B) metaphase chromosomes become aligned at the metaphase plate. C) chromosomes are grouped during telophase. D) the nucleus is located prior to mitosis. E) new spindle microtubules form at either end.
Assuming that you are trying to determine the true effect of how years of education affect career earnings (Earningsi = ?0 + ?1Educationi + Ui), and that this effect is positive (i.e., all else equal more years of education lead to higher career earnings, ?1 > 0). What would be the likely induced correlation between Education and Ui of receiving a sample that only had individuals that made over $85,000?
A. Positive B. Negative C. There is not enough information. D. None of the answers is correct.