Sickling occurs in deoxyhemoglobin s but not in oxyhemoglobin s. oxyhemoglobin has a small, hydrophobic pocket in a β chain region located in the interior of the protein. in deoxyhemoglobin, however, this pocket is located on the surface of the protein. in deoxyhemoglobin s, val 6 interacts with this surface pocket, leading to aggregation of hbs. choose two amino acids that would be reasonable canidates for the pocket-val 6 interaction.

(a) phenylalanine
(b) leucine
(c) serine
(d) arginine
(e) glutamate

Which of the following is a consequence of urban heat islands? increased precipitation downwind of the city? increased precipitation upwind of the city? decreased winds within the city? increased winds within the city?

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

Nucleic acid certain protein cell membranes certain carbohydrates