An accurate and comprehensive description of pseudogenes must include the statement that (Select all that apply)
A. pseudogenes encode proteins, but the translated proteins are non-functional.
B. pseudogenes may have some gene-like features such as a promoter and splice sites.
C. all pseudogene pretend to transcribe other genes when they only transcribe one type of genetic information.
D. pseudogenes can provide insight into the evolutionary history of the related functional gene.
E. every pseudogene has a similar DNA sequence to some functional gene.
Answer: E
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Platelet-derived growth factor (PDGF) is a signaling molecule that functions in which of the following types of cell signaling?
A. juxtacrine B. paracrine C. autocrine D. endocrine E. All of these choices are correct.
Which of the following events do notoccur during spliceosome assembly on pre-mRNAs?
A. U1 snRNP binds to the 5' splice site. B. U2 snRNP binds to the branch point. C. U6 snRNP binds to the 3' splice site. D. U5 snRNP binds to the 5' splice site.
The relatively simple excretory system used by flatworms consists of tubules called
a. nephrons. b. hepatic tubules. c. metanephridia. d. Malpighian tubules. e. protonephridia.
Compared to just a century ago, a much larger percentage of the population is living to be 80-90 years old. Why does cancer seem to be a much larger problem today than a century ago?
What will be an ideal response?