In the traditional phylogeny (A), the phylum Platyhelminthes is depicted as a sister taxon to the rest of the protostome phyla and as having diverged earlier from the lineage that led to the rest of the protostomes
In the molecular phylogeny (B), Platyhelminthes is depicted as a lophotrochozoan phylum. What probably led to this change?
A) Platyhelminthes ceased to be recognized as true protostomes.
B) The removal of the acoel flatworms (Acoela) from the Platyhelminthes allowed the remaining flatworms to be a monophyletic clade clearly tied to the Lophotrochozoa.
C) All Platyhelminthes must have a well-developed lophophore as their feeding apparatus.
D) Platyhelminthes' close genetic ties to the arthropods became clear as their Hox gene sequences were studied.
Answer: B
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Imagine that a very unusual animal species had the ability to make its own aromatic amino acids using a 5-enolpyruvylshikimate-3-phosphate (EPSP) synthase enzyme similar to that of plants. What would happen if this animal foraged in a field of glyphosate-resistant plants?
A. No effect. B. They would become sick from the glyphosate that was sprayed on the plants. C. They would also become glyphosate-resistant. D. They would no longer need to make their own aromatic amino acids. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about herbicide resistance transgenes? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A female horse can mate with a male donkey but they will produce a mule that is sterile. This is an example of what
type of isolation mechanism?
a. allopatric b. physical c. behavioral d. reproductive e. geological
Within the cell, glycolysis takes place in the ____
Fill in the blank(s) with the appropriate word(s).
Microtubules contribute to each of the following except
A) intracellular transport. B) the human red blood cell disklike shape. C) orientation of plant cellulose microfibrils. D) filopodial structure. E) mitotic spindles.