Normal hemoglobin is a tetramer, consisting of two molecules of ? hemoglobin and two molecules of ? hemoglobin. In sickle-cell disease, as a result of a single amino acid change, the mutant hemoglobin tetramers associate with each other and asse

A) only altered primary structure
B) only altered secondary structure
C) only altered tertiary structure
D) only altered quaternary structure
E) altered primary structure and altered quaternary structure; the secondary and tertiary structures may or may not be altered


Answer: E

Biology & Microbiology

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Indicate whether this statement is true or false.

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A. morbidity B. mortality C. index D. prevalence

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All of the following are true of angiosperm

gametophytes EXCEPT that they a. produce haploid sex cells. b. arise from cells within the flowers. c. are independent of the sporophyte. d. produce eggs and/or sperm cells. e. develop by mitosis.

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The opening in the front of the eye that is surrounded by the iris and through which light passes is the

A. pupil.
B. retina.
C. sclera.
D. aqueous humor.
E. iris.

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