Which of the following is not a stage of interphase?
A. cytokinesis
B. S
C. G1
D. G2
Answer: A
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Luminescence
A. is catalyzed by luciferase. B. may be controlled by quorum sensing. C. may be produced by bacteria. D. All of the choices are correct.
Where do antigen-presenting cells interact with T cells?
a. the thymus gland
b. the pituitary gland c. the lymph nodes d. the adrenal glands e. the bone marrow
Which soil type has the most minerals?
a. gravel b. sand c. clay d. humus e. silt
The Cerulean warbler is a songbird that breeds in the eastern and middle United States and winters in Central America. Its numbers have been rapidly declining over the past 50 years. You are interested in the reasons for this rapid decline and so you gather data. The Brown cowbird is a brood parasite-it lays eggs in other bird's nests. Although native to parts of the United States, it has been invading new regions. The graph above shows data you collected on the abundance of Brown cowbirds and Cerulean warblers at various locations. Based on an inspection of the graph, what can you conclude?
A. Brown cowbird abundance is directly correlated with Cerulean warbler abundance. B. Brown cowbirds are responsible for the decline of the Cerulean warbler. C. Brown cowbirds do not appear to affect Cerulean warblers. D. The abundance of Brown cowbirds shows a negative relationship with Cerulean warbler abundance. E. Since both birds are native to the United States, the cowbird cannot be affecting the warbler.