In some cases the DNA lesion is bypassed by the DNA polymerase, leaving a gap that is single-stranded and contains the lesion. Since the gap is single-stranded the lesion cannot be repaired
Which of the following is not a feature of the repair of such gaps?
A. The 3' single-strand overhang invades the intact portion of the chromosome, pairs with its complementary strand, and displaces the other.
B. Strand invasion occurs by the intact, lesion-containing strand.
C. Branch migration generates two Holliday junctions.
D. The displaced, undamaged strand is replicated.
E. Holliday intermediates are cleaved by resolvases.
A
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Which observations illustrate shared ancestry by anatomical comparison studies? Check all that apply.
_____ The same structure has evolved to carry out different functions. _____ Different structures evolve in similar ways when subjected to the same selective pressures. _____ A structure becomes vestigial. _____ Structures are found to be homologous.
Male crickets create sounds that we call "chirps" by rubbing one wing against the other. A female cricket is attracted to the chirps and mates with the male once she locates him. Is this an example of communication?
A. Yes, because one individual produced information. B. Yes, because one individual received information. C. Yes, because information from the sender altered the receiver's behavior. D. Yes, because the exchange of information resulted in a benefit to the sender. E. Yes, because the exchange of information resulted in a benefit to the receiver.
__________ are produced in organs known as __________
a. Gametes; gonads b. Gonads; gametes c. Sperm; spermatocytes d. Eggs; uterus
A test offered on the Web by a direct-to-consumer genetic testing company genotypes a gene for ability to taste bitter substances. This test is not regulated by the Clinical Laboratory Improvement Amendments (CLIA) because
A) the test is not expensive. B) the test provides information, not a diagnosis. C) the test is offered in a state of the U.S. not covered by these regulations. D) the Genetic Information Nondiscrimination Act outlawed CLIA. E) it is not accurate.