Which of the following frequently causes health-care-associated infections of the GI tract?
A. Salmonella enteritidis
B. E. coli
C. Staphylococcus aureus
D. Clostridium difficile
Answer: D
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Darwin predicted that advantageous, heritable characteristics would become less common in a population when
individuals were forced to compete for limited resources
a. True b. False
Biogeochemical cycles involve
A. the movement of chemicals through ecosystems. B. all chemical elements plus light energy. C. just those nutrients that are limiting for organisms. D. the nutrients used solely by primary producers E. None of the answers are correct.
Hamilton explained the origin of altruism in selected insect societies with his kin selection model of sex determination. Since males are haploid and females are diploid, the workers share a very high proportion of alleles, theoretically as high as 75%. What is this called?
A. Haplodiploidy B. Haploidy C. Diploidy D. Parthenogenesis E. Altruism
Which of the following cells attacks virally infected cells and cancer cells?
A) Helper T cell B) Cytotoxic T cell C) Dendritic cell D) B cell E) Macrophage