Iron is a limiting factor in many aquatic ecosystems. If the iron level is increased, the amount of phytoplankton (which feed on iron) decreases
Indicate whether the statement is true or false
FALSE
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You are working with a gene associated with an essential pathway that is necessary at two time points in an organism's lifetime. With regard to gene regulation, you would expect the gene to be
A) not constitutive. B) associated with response to distinct events. C) "activated" by particular signals (induced). D) "turned off" by particular signals (repressed). E) all of the above
A shift from expected allele frequencies, resulting from chance, is known as
a. natural selection. b. genetic drift. c. mutation. d. gene flow.
The nucleus of an atom is composed of two subatomic particles, ________ and ________.
A. protons; electrons B. neutrons; electrons C. protons; neutrons
Humans belong to which of the following domains?
A) Bacteria B) vertebrates C) Eukarya D) Archaea