11. Daring DNA replication in E coli, what is the role of DaaA? DaaA carries the

Question

11. Daring DNA replication in E coli, what is the role of DaaA? DaaA carries the helicase protein to the open region of DNA where hydrolysis will occur B) DnaA is a helicase that uses ATP to hydrolyze hydrogen bonds and separate DNA C) DnaA prevents reannealing of the separated strands so replication can proceed D) DnaA is a region of DNA recognized by the polymerase where replication is init E) DnaA bends DNA, hydrolyzing the hydrogen bonds in the 13-mer oriC sequence and creating the replication bubble 12. Which of the following is not necessary for transcription in bacteria? Single stranded DNA polymerase Uracil 13. Which of the following is trwe of telomerase? A) It is composed of an RNA sequence and protein It adds sequences of DNA to the longer parent strand Q)It adds repeated sequences of DNA to the shorter daughter strand D) A and B Only E) A and C Only 14. To map genes of a bacterial strain, conjugation must be interrupted at given times. Suppose you have Hfr cells of genotype atbre+dte+strR and F- cells of genotype arb-e-d-e-strS and you combine these two cultures in liquid medium in four blenders at time 0. After intervals of 3, 6, 9, and 12 minutes, you turn on successive blenders. This graph shows the results of plating the cultures of each blender. What is the correct order of the genes on this chromosome? A)beca(d is unknown) acebd bccad Diabede 15. An explorer stum these plants were autopolyploid and came was produced. Which of bled upon a remote valley and found plants that produced a colorful, sweet fruit. in varieties that differed by their ploidy and the size of fruit that Many of A) Tetraploid (4n) likely D) Diploid (2m) E)T

Explanation / Answer

11. Option E

DnaA bends DNA, hydrolyses A=T rich DNA unwinding element, creating replication bubble.

12. A

13. E (A and C only)

14. B

15. B (lack of homologous chromosomes prevents pairing during meiosis)

16. D

17. E

18. A (during metaphase, nonhistone core acts as scaffold to which radial loops of DNA are attached at regular intervals)

19. E

20. E (allopolyploid is an organism in which chromosomes are composed of more than two genomes derived from more than two species)

21. B

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