Which of the following organisms is likely to show a late-loss survivorship curve?
a. mussel
b. flowering plant
c. squirrel
d. elephant
e. sea turtle
D; Late-loss survivorship curves are seen for organisms that provide a high level of parental supervision for the offspring. Of the choices, this is only seen in elephants.
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Which inheritance pattern is common to oogenesis, spermatogenesis, and embryogenesis?
A. Maternal inheritance B. Epigenetic inheritance C. Maternal effect D. Paternal inheritance
The quick response of the immune system to a second infection is due to the _____, a feature of the immune system as demonstrated by the success of vaccines
a. activation of macrophage cells b. suppression of suppressor cells c. T and B memory cells d. high levels of antigen e. new cytotoxic T cell.
Which muscles are involuntary?
a. cardiac and smooth b. cardiac and skeletal c. smooth and skeletal d. only skeletal e. only cardiac
Consider a genetic mutation which causes T helper cells to be unable to respond to stimulation by the cytokines which lead to TH2 differentiation. This mutation would cause a patient to be deficient in which activity?
A) production of memory cells B) action of macrophage C) production of antibodies D) decrease of the immune response once the pathogen is eliminated E) action of cytotoxic T cells