Most of the wood of a tree trunk consists of
A. vascular tissue.
B. collenchyma tissue.
C. sclerenchyma tissue.
D. dermal tissue.
E. parenchyma tissue.
Answer: C
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Refer to the paragraphs on the Krings et al. paper. How could the "demographic history of Neanderthal populations" be explored if mitochondrial DNA from other Neanderthal samples could be PCR amplified?
A) These Neanderthal sequences could be compared to those of modern humans to learn how modern humans evolved to walk on two legs (bipedalism). B) These Neanderthal sequences could be compared to those of modern humans; the more they differ, the more distant the time of divergence between the Neanderthal and modern human lineages. C) These Neanderthal sequences could be compared to each other to see how much they differ; the more they differ, the greater the divergence between these populations. D) In the attempt to amplify other Neanderthal DNAs, those that amplify must be from more modern populations and those that don't are from more ancient populations.
Typically, these bacteria would be captured and ingested, before they become established, by
a type of phagocyte called a(n) __________.
a. macrophage b. histamine c. antigen d. adaptive response
Could two phenotypically normal parents have a color-blind child?
a. Yes b. No
In an average ecosystem, about how much energy is present in the organisms at a given trophic level compared to the organisms at the next higher trophic level?
A) a tenth as much B) half as much C) twice as much D) ten times as much