There are almost 500 naturally occurring variants of hemoglobin. most are the result of a single amino acid substitution in a globin polypeptide chain. some variants produce clinical illness, though not all variants have deleterious effects. identify the variant or variants that can be described by each of the three statements by placing the letter corresponding to the statement next to the variant. statement b may describe more than one variant, and a variant may be described by more than one statement. at least one variant will not match any description. a. the hb variant least likely to cause pathological symptoms. b. the variants most likely to show pi values different from that of hba on an isoelectric focusing gel. c. the variant most likely to show a decrease in bpg binding and an increase in overall affinity for oxygen.

The diagram below represents a marine food web and a process that can harm the human population. each circle represents an organism and the smaller dots inside them represent a toxic substance. what is being represented and how does it harm the population? the diagram represents biological half-life, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents biomagnification, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents the process by which different organisms prey upon each other; this can impact the human population by reducing the number of organisms that do not contain the toxin. the diagram represents the way that toxins are metabolized by living organisms, with those at greater trophic levels able to metabolize more efficiently than those at lower levels. this means that those at higher tropic levels are safer for humans to consume compared to the organisms at lower trophic levels.

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

Zoo geographic regions are characterized by the presence of specific groups of animals these regions are determined by the taxonomic or phylogenetic relationships of animals. the map shows the zoogeographic regions proposed by the naturalist alfred russel wallace in 1876. the similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between the organisms in both locations ?