Which of the following statements are TRUE about the structure of hemoglobin? (Select all that apply.)
a. The hemoglobin molecule is a protein made up of four subunits bound together.
b. Each of the four heme groups in a hemoglobin molecule contains one atom of iron (Fe2+), to which molecular oxygen binds.
c. 2,3 diphosphoglycerate increases hemoglobin's affinity for oxygen.
d. The relationship between the percentage of saturation of hemoglobin and PO2 is linear.
Answer:
a. The hemoglobin molecule is a protein made up of four subunits bound together.
b. Each of the four heme groups in a hemoglobin molecule contains one atom of iron (Fe2+), to which molecular oxygen binds.
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As many as 60% of people in malaria-infected regions of Africa have the sickle-cell allele, but only about 10% of the U.S. population of African ancestry carries the allele. Malaria remains a major disease in central Africa but has not been a serious problem in the U.S. for many generations. What is/are the reason(s) for the difference in the percentages and what is a reasonable statement about future percentages?
A. The presence of malaria in Africa maintains the advantage of the heterozygous sickle-cell trait, and the prevalence of malaria will likely continue to preserve the 60% rate. B. Lack of widespread malaria in the United States would have resulted in both homozygous and heterozygous carriers of sickle cell undergoing several generations of negative selection. We should expect this to continue unless innovative therapies give all individuals an equal chance of surviving and reproducing. C. The U.S. percentage may have always been somewhat lower due to immigration from nonmalaria regions, but changes in sites and rates of immigration could occur. D. All of the choices are reasonable.
The process by which the sun's energy generates a water potential difference causing water to evaporate from leaf surfaces is called
a. root pressure b. transpiration c. osmosis d. adhesion of water molecules e. cohesion of water molecules
The full set of genetic instructions of an organism is its (phenotype/genome/genotype)
What will be an ideal response?
Men increase faster and to a greater extent than do women on similar weight training programs.
a. true b. false