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

Biology & Microbiology

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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.

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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.

Biology & Microbiology

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?

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Erwin Chargaf demonstrated that in DNA the amount of A is about the same as the amount of G

a. true b. false

Biology & Microbiology