In comparing the streamlined nature of a dolphin and that of a shark, you conclude that the streamline feature evolved independently in sharks and dolphins. This common characteristic most likely is the result of:
a) dolphins evolving from sharks.
b) convergent evolution.
c) homology.
d) highly similar DNA sequences.
e) descent from a recent common ancestor.
Ans: b) convergent evolution.
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The monarch butterfly has an undesirable taste and the viceroy butterfly has a selective advantage because it looks like
the monarch. This is an example of ____.
a. aposematic coloration b. Batesian mimicry c. competitive exclusion principle d. cryptic coloration e. Müllerian mimicry
Using structural characteristics to differentiate species on the basis of key physical characteristics is called the
A. morphological species concept. B. fitness concept. C. gene frequency concept. D. biological species concept.
Refer to the paragraph on Brown et al. and Morwood et al. It is speculated that H. floresiensis and H. sapiens may have lived on Flores concurrently
Suppose researchers obtained mitochondrial DNA samples from the H. floresiensis remains, amplified a 1000-base-pair sequence via PCR, and compared it to that of several currently living H. sapiens native to Indonesia, North Africa, and North America. Also suppose H. floresiensis were found to differ from the average Indonesian H. sapiens in 28 base pairs, from the average North African H. sapiens in 51 base pairs, and from the average North American H. sapiens in 53 base pairs, while two randomly selected H. sapiens differed from each other in an average of 21 base pairs. What would you surmise from these data? A) H. floresiensis and H. sapiens probably did not live on Flores concurrently. B) H. floresiensis and H. sapiens probably lived on Flores concurrently but did not interact. C) H. floresiensis and H. sapiens probably lived on Flores concurrently, and H. sapiens killed and consumed H. floresiensis. D) H. floresiensis and H. sapiens probably lived on Flores concurrently and interbred to some degree.
Opsonization is the enhancement of ________ due to the deposition of ________ or ________ on the surface of a pathogen or other antigen
a. resistance / antibody / lipids b. resistance / lipids / proteins c. phagocytosis / antibody / complement d. phagocytosis / PAMPs / PRR