Imagine that a man is scratched by his cat. A phagocyte near the scratch site recognizes and engulfs a bacterium. Shortly thereafter, more phagocytes arrive in the tissue surrounding the scratch. Why? Select all correct choices
A. Other phagocytes are recruited to the
scratch site by antigens secreted by the
bacteria.
B. Other phagocytes are recruited to the
scratch site by cytokines produced by the
bacteria.
C. Other phagocytes are recruited to the
scratch site by antigens secreted by the initial
phagocyte.
D. Other phagocytes are recruited to the
scratch site by cytokines secreted by the
initial phagocyte.
D
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Comparisons between the cytochrome b protein sequence in the honeycreeper versus the deer mouse and the Gough
Island finch reveals eighteen and four amino acid differences, respectively. Therefore, _____.
a. the honeycreeper is more closely related to the deer mouse b. the honeycreeper and the Gough Island finch are the same species c. the honeycreeper is more closely related to the Gough Island finch d. no DNA mutations have occurred during the evolution of the honeycreeper e. the DNA sequences of all three species are identical
Matching. Choose the one most appropriate answer
for each. Some letters may not be used. 1. ___ abscisic acid 2. ___ annual 3. ___ biennial 4. ___ coleoptile 5. ___ ethylene 6. ___ salicylic acid 7. ___ gibberellin 8. ___ auxin 9. ___ phytochrome 10. ___ circadian 11. ___ short-day plant 12. ___ target cell 13. ___ long-day plant 14. ___ Pfr 15. ___ vernalization A. flower each successive year or after several years of vegetative growth B. promotes cell elongation in stems C. has receptor sites for a particular hormonal message D. a hollow, cylindrical organ that protects young leaves growing within it E. blue-green pigment that absorbs light energy F. low-temperature stimulation of flowering G. stimulates stomata closure and might be involved in root geotropism H. stimulates fruit ripening I. reproduces in spring J. produces only roots, stems, and leaves the first growing season and produces flowers the second year K. occurring on a 24-hour cycle L. flowers in autumn M. a nonhormonal plant growth regulator N. lives for only one growing season O. promotes stem elongation in plants P. pigment involved in flowering process
The cardiac muscle tissue is called the ________
A) pericardium B) myocardium C) endocardium D) coronary chamber
Shade-tolerant plant species are generally found early in succession and are replaced by hardier, shade-intolerant species
Indicate whether the statement is true or false