Which one of the following is the main reason that a typical eukaryotic gene is able to respond to a far greater variety of regulatory signals than a typical prokaryotic gene or operon?
(a) Eukaryotes have three types of RNA polymerase.
(b) Eukaryotic RNA polymerases require general transcription factors.
(c) The transcription of a eukaryotic gene can be influenced by proteins that bind far from the promoter.
(d) Prokaryotic genes are packaged into nucleosomes.
(c)
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Choose the true statements about the evolution of complex characters, such as powered flight.
_____ Phylogenetic analysis using cladistics can help reveal the sequence leading to the evolution of a complex character. _____ Usually a single mutation in one gene leads to the simultaneous appearance of the complex character. _____ Often the initial stage in the evolution of a complex character was an adaptation to some unrelated selection pressure. _____ The intermediate stages in the evolution of a complex character had no fitness advantage.
__________ are proteins, Y-shaped antigen receptors made only by __________ cells. Fill in the blank(s) with the appropriate word(s)
Which of the following should NOT be used in
the development of science? a. evaluation of data b. personal conviction c. prediction d. systematic observation e. sharing ideas
Red blood cells, white blood cells, and platelets are all formed from stem cells located in bone marrow.
a. true b. false