You're examining the structure of a newly discovered protein, and you see that it includes lots of a-helices and B-pleated sheet. Your specific observations are of the ______________ structure of the protein, and are the direct results of _____________?
Fill in the blank(s) with the appropriate word(s).
secondary, localized folding
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What do you know about steroid receptors? What other information is related to the question?
What will be an ideal response?
The whorl of a flower that consists of all the sepals is the
A. stigma. B. calyx. C. corolla. D. carpel. E. stamen.
Because genetic information is stored as a linear sequence of bases in DNA, any change in the order or number of
bases in a gene can result in a(n) ____________________ that produces an altered ____________________. Fill in the blank(s) with the appropriate word(s).
Can two different species that are members of the same clade have more than one common ancestor? Choose the MOST correct answer and explanation.
A. Yes. Although two species in the same clade have only one most recent common ancestor, they also have a number of older common ancestors that occurred earlier in their evolutionary history. B. Maybe. Two species in the same clade can have more than one common ancestor only in cases where horizontal gene transfer from a third, previously unrelated, species has occurred. C. Yes. Two species of the same clade always have eight common ancestors, matching the number of levels higher than species in the taxonomic hierarchy. D. Maybe. If they are members of a paraphyletic clade, they can have more than one common ancestor. E. No. Because they are members of a clade, by definition they can have only one common ancestor.