Moss sperm are transported to the archegonia by:
a. wind.
b. water.
c. hummingbirds.
d. insects.
e. both insects and water
E
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In a review paper published in 2000, Adoutte et al. examined some animal phylogenies generated by comparing the ribosomal RNA (rRNA) of animals from many different phyla. They then integrated these independently created phylogenies into one phylogeny that best fit all the data. The figure below compares a traditional phylogeny based on morphological characteristics (A) to the new molecular-based phylogeny described by Adoutte et al. (B). Note that platyhelminthes, nemerteans, and entoprocts, which do not have coeloms and are classified as acoelomates in the morphological phylogeny, are reclassified as lophotrochozoans in the molecular phylogeny. Similarly, groups classified as pseudocoelomates in the morphological phylogeny are reclassified as either lophotrochozoans or ecdysozoans in the molecular phylogeny; other lophotrochozoans and ecdysozoans have coeloms. Copyright 2000 National Academy of Sciences, U.S.A. (A. Adoutte, G. Balavoine, N. Lartillot, O. Lespinet, B. Prud'homme, and R. de Rosa. 2000. The new animal phylogeny. Proceedings of the National Academy of Sciences USA 97(9):4453-56.) What does this reclassification based on molecular data imply about the evolution of acoelomates, pseudocoelomates, and coelomates? A) Pseudocoelomates can be seen as an intermediate stage between acoelomate and coelomate development. B) Although acoelomates and pseudocoelomates evolved only once, coelomates evolved multiple times in different lineages. C) Only the animals that evolved earliest are acoelomates. D) Some pseudocoelomates and acoelomates have evolved from coelomates.
. It’s Friday afternoon, which means it’s time to clean out the shared fridge in the break room. Besides the usual assortment of half-eaten sandwiches and stale diet cola, you discover a moldy orange in a drawer that looks like it’s been there forever. Next to it you find a scribbled note that turns out to be a limerick: My lunch last week was ricotta With a couple of oranges and a soda But yesterday my sweet oranges Sprouted fuzzy black sporanges And now all I’ve got is Deuteromycota Chuckling to yourself, you can’t help but notice that the poet is using outdated and inaccurate terminology. Assuming that the orange is covered in bread mold (Rhizopus stolonifer), to which phylum does it belong?
a. Chytridiomycota b. Basidiomycota c. Zygomycota d. Ascomycota
Gastric bypass surgery
a. is more effective than standard weight loss methods. b. reduces the size of the patient's stomach and small intestine. c. reduces the amount of ghrelin secreted, so the patient feels less hungry. d. may increase the risk of vitamin and mineral deficiency. e. does all of these
The only cytoskeletal fibers not associated with intracellular movement or whole cell locomotion are _________
Fill in the blank(s) with the appropriate word(s).