Antibody response that occurs upon the first exposure to an antigen
A. Primary Response
B. IgM
C. Secondary Response
D. IgG
E. Latent Period
F. 1st Exposure
G. 2nd Exposure
A. Primary Response
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The Cerulean warbler is a songbird that breeds in the eastern and middle US and winters in Central America. Its numbers have been rapidly declining over the past 50 years. You are interested in the reason(s) for this rapid decline and set about to make observations and gather data. The graph above shows data you collected on the abundance of Brown cowbirds (nest parasites) and Cerulean warblers at various locations. Based on a visual inspection of the graph, what can you conclude?
A. Brown cowbirds are responsible for the decline of the Cerulean warbler.
B. The abundance of Brown cowbirds shows a negative relationship with Cerulean warbler abundance.
C. Brown cowbird abundance is significantly correlated with Cerulean warbler abundance.
D. The abundance of Brown cowbirds shows a positive relationship with Cerulean warbler abundance.
E. Brown cowbirds do not appear to affect Cerulean warblers.
Steroid hormones
a. are proteins. b. include testosterone, estrogens, and cortisol. c. never activate second messengers. d. never alter membrane transport of ions. e. fit all of these descriptions.
Milk production in women is under the control of
a. estrogen. b. prolactin. c. oxytocin. d. prostaglandin. e. progesterone.
Catalytic proteins are known as ________ whereas catalytic RNA molecules are known as ________.
A. ribozymes; enzymes B. enzymes; catalozymes C. enzymes; ribozymes D. catalozymes; ribozymes