Quick Bio Questions!

[fuqele]

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Hey guys,

Taking the test in a week so I'm speeding through destroyer!!! Anyway, I have a couple questions on the bio section (2010 version) and I'll really appreciate some help. 😀

The first one is #348. It asks sporangia could be found in which of the following, and the answer includes angiosperms and gymnosperms. Sporangia is the structure that hosts spores, and I thought angiosperms and gymnosperms produce seeds instead of spores?

The other question concerns cardiac muscle. Destroyer says cardiac muscle only has one nucleus, but Kaplan says that cardiac muscles has 1-2 nucleus and Cliff's says 1-a couple. So does cardiac muscle count as mononucleated?

Thanks!

Also, anyone else taking it soon?? I'm so scared T_T

 

[TXpredent]

From my histology class, I know there are cardiac cells with more than one nucleus, BUT in my Kaplan class my teacher said for the purposes of the DAT we should consider cardiac cells mononucleated? Was that the answer?

I have no idea about the first one though, I'm still trying to understand that crazy plant biology stuff myself. In my notes, I have that angiosperms are dominantly in the sporophyte generation. Which I think means they have sporangia.

 

[cdbebeau]

Your first question sounds ambiguous. The DAT won't have questions that unclear. For peace of mind, you might want to read more about alternation of generations. They might just be asking you to identify in what species the sporophyte generation is dominant (angio, gymno, clubmosses, horsetails, ferns) over the gametophyte generation. For the second question, I'd believe Destroyer and Cliff's. I used Kaplan and found a bunch of errors.

 

[Mich17]

Angiosperms have micro and megasporangia. Micro is associated with the male portion and for angiosperms it is found in the anther portion of their stamen. That's how pollen grains keep getting produced. The Megasporangia (female part) is found in the ovules of the ovary. I know gymnosperms have sporangia as well (somewhere in their cones I believe) but I understand angiosperms way better. Hope that helped!

 

[fuqele]

Thanks for all the replies!
I think I have to study plant reproduction more carefully. @_@

 

[Dotoday]

Destroyer is correct on both counts. Angiosperms and Gymnosperms have sporangia, but at different point during development comparing to other species. It would really help to review alteration of generations in Campbell's Bio book. They explain it very well.
As for the polynucleated cardiac muscle cells. They do exist, but in some instances. For the purpose of scientific facts on the DAT, they do not. It is simply beyond the scope of the test.
Hope this helps. Good luck.