Two F+ E. coli strains are co-cultured in the same flask. One is Strr Thr+ and the other is Genr Thr?. The culture is then plated on minimal media that is supplemented with gentamycin only (not threonine) and a few colonies grow. What sort of genetic exchange is most likely occurring?
A) transformation
B) conjugation
C) transduction
D) electroporation
A) transformation
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The second meiotic division resembles mitosis because:
A. sister chromatids are separated during anaphase II to become the chromosomes of the daughter cells. B. microtubules attach from opposite directions to the centromere of each sister chromatid pair. C. chromosomes decondense during telophase II. D. the daughter cells have the same number of chromosomes as the parent cells. E. All of these choices are correct.
Which structure will house the DNA in a Eukaryotic cell?
a. Mitochondria b. Nucleus c. Nucleoid region d. Golgi body e. Chloroplast
What do gametes, spores, and the gametophyte
generation have in common? a. They are all diploid. b. They are all haploid. c. They are present in vascular plants only. d. They are all produced by meiosis. e. They have none of these in common.
Why are Africanized honeybees more dangerous than European honeybees? What will be an ideal response?