What mechanisms contribute to the formation of deletions and insertions? (Select all that apply.)
A) Repair of double-strand breaks in DNA
B) Errors in DNA replication
C) Unequal crossing-over due to mispairing of homologs
D) Repair of thymine dimers in DNA
A) Repair of double-strand breaks in DNA
B) Errors in DNA replication
C) Unequal crossing-over due to mispairing of homologs
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Shigella and cholera toxin both
A. have an A-B arrangement. B. work through ADP ribosylation. C. increase cAMP levels. D. prevent protein synthesis.
When a planarium is cut in half, a head will regenerate from the wounded anterior end and a tail will regenerate from the wounded posterior end. This is an example of
A. conditional specification. B. autonomous specification. C. fate mapping. D. Spemann's organizer. E. transforming growth factor.
You are a farmer that grows corn. You are offered a genetically modified variety of corn that is 100
percent resistant to corn borers. You have to decide what proportion of your field you should plant in resistant corn versus a variety that is susceptible to corn borers. Explain why you might choose one of the following proportions of resistant to susceptible: 100:0, 90:10, 75:25, or 50:50.
What will be an ideal response?Erwin Chargaf demonstrated that in DNA the amount of A is about the same as the amount of G
a. true b. false