Which element's isotope is commonly used to determine when biological samples such as fossils, were formed?
A. oxygen
B. hydrogen
C. carbon
D. nitrogen
E. sulfur
C
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____ is a regulatory protein that slows the
production of muscle proteins.
a. Actin b. Myosin c. Troponin d. Testosterone e. Myostatin
Which cells release antibodies into the plasma?
a. T helper cells b. plasma cells
c. cytotoxic T cells d. B cells e. antigen presenting cells
In the accompanying figure of Jones and Reithel's work with snapdragons, what is the most likely outcome if these plants were in a natural setting?
A) A 2% change is too small to be significant, so yellow and white flowers will remain in roughly equal percentages in future generations. B) Yellow and white flowers will oscillate in frequencies, depending on environmental conditions such as rainfall. C) Yellow flowers will continue to increase in frequency, as compared to white flowers, over time. D) Because the yellow trait is recessive, yellow flowers will ultimately take over the population.
The ________ spreads more parasitic diseases to humans than any other vector
A) kissing bug B) mosquito C) tick D) louse E) mite