Explain the difference between plasmogamy and karyogamy
What will be an ideal response?
Plasmogamy is the fusion of two cells so they share a common cytoplasm but keep the two original
nuclei separate. It results in a cell that has two distinct nuclei, also called a dikaryon, with ploidy of n +
n. Karyogamy is the fusion of the two nuclei; when this occurs, the cell ceases being an n + n dikaryon
and instead becomes a true 2n diploid cell.
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A protein called actin consists of 376 amino acids. The mRNA for actin must be longer than
A. 125 nucleotides. B. 376 nucleotides. C. 1128 nucleotides D. 3384 nucleotides.
Which of the following is most likely the cause of the current extinction crisis?
a. asteroid impact b. human activity c. adaptive radiation d. tectonic activity e. rising sea levels
Endospores can be inactivated by
A. incineration. B. dry heat at 170°C for 2 hours. C. glutaraldehyde for 3 or more hours. D. ethylene oxide for 3 or more hours. E. All of the choices are correct.
Peptide and protein hormones are polar molecules that ____.
A. inhibit the effect of nonpolar hormones B. alter the effect of certain genes C. bind to a receptor at the cell membrane D. move directly across the cell membrane and enter the nucleus E. form ATP