A technique that is used to artificially transform a bacterium is called electroporation. Electroporation:

a. exposes cells briefly to rapid pulses of electrical current.
b. exposes cells to calcium ions.
c. exposes cells to stomes.
d. inserts the foreign DNA into the DNA in the chloroplast.
e. inserts the foreign DNA into the plant's mitochondrial DNA.


A

Biology & Microbiology

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These structures are held together by cohesin:  

A.  Nucleosomes B.  Sister chromatids C.  Homologous chromosomes D.  Solenoids

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Which of these is not part of a seed?  

A.  endosperm B.  embryo C.  diploid cells D.  seed coat E.  fruit

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Two genes (A and B) are located on each of two pairs of homologous chromosomes. In a tetrad, one sister chromatid

contains alleles ab, while the other sister chromatid contains alleles AB (upper and lower case indicate different alleles of the same gene). Which genetic combinations are possible in the four gametes that are produced from a single chiasma between these chromosome pairs?

a. Ab, AB, ab, aB b. Ab, Ab, aB, aB c. Aa, Bb, ab, Ab d. Ab, Ab, AB, AB e. AB, AB, ab, ab

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Answer the question using the accompanying figure. The male bee represented by letter A is ____ and the queen bee

represented by letter B is ____.

a. diploid; triploid b. haploid; triploid c. triploid; diploid d. diploid; haploid e. haploid; diploid

Biology & Microbiology