Many proteins are now thought to consist of modular units that through exon shuffling form new proteins. How is this situation analogous with what may have been the situation with the earliest life?
What will be an ideal response?
ANS:
Metabolic processes within cells would not have been integrated early, and cell functions would have been modular. Swapping modular components may have been the original life-forms, much like protein modules are assembled in new ways to make new proteins.
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Memory, emotions, and thinking about smells are all found in the ________
Fill in the blank(s) with correct word
One way embryonic cells can learn their position in an embryo is by detecting the concentration of a
A. morphogen B. DNA polymerase C. gene (segment of DNA) encoding a transcription factor
Altruism can be distinguished from reciprocal altruism because altruism is defined as ____ but
reciprocal altruism involves ____.
a. the sacrifice of an individual's reproductive success to help others; the expectation of a future favor in return for present aid b. aid given to nonrelatives; benefits given to close relatives only c. the expectation of a future favor in return for present aid; close relatives helping each other d. low-risk behavior that provides minor benefits to others; high-risk behavior providing major benefits to others e. aid given to relatives; benefits given to nonrelatives only
The portion of the DNA molecule that is not
translated and is a noncoding portion of DNA is composed of a. introns. b. anticodons. c. exons. d. transcriptons. e. exons and transcriptons.