Identify several ways in which the study of hemoglobin variants led to an understanding of the molecular relationship
among genes, proteins, and human disease. What will be an ideal response?
ANSWER: The discovery of variations in the amino acid composition of hemoglobin was the first
example of inherited variations in protein structure. The altered hemoglobin in sickle cell
anemia provided the first direct proof that mutations result in a change in the amino acid
sequence of proteins. Also, the mutation in sickle cell anemia provided evidence that a
change in a single nucleotide is sufficient to cause a genetic disorder. The molecular
organization of the globin gene clusters has helped scientists understand how genes evolve
and how gene expression is regulated.
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Most dinosaurs died out by the end of the ____ period
a. Triassic b. Jurassic c. Cretaceous d. Quaternary e. Permian
One of the major symptoms of Marfan syndrome is
a. hypertension. b. rupture of the aorta. c. retardation. d. short stature. e. abnormally short arms and legs.
What is a tuber?
A) an enlargement of an underground stem B) a root that's modified for nutrient storage C) the reproductive organ of a gymnosperm D) a modified leaf that serves as a nutrient storage structure
Looking at the figure above, you can see that if we compare leg diameter to body mass in mammals ranging from the size of a shrew to the size of an elephant, all conform to a tightly defined relationship
All of the mammals measured lie along a tight line across a millionfold difference in body mass. Why is this so? What will be an ideal response?