A newborn is identified as having sickle-cell anemia. While both parents are healthy, a screening of both parents will most likely reveal:

A. both mother and father are carriers of a mutant ? chain gene.
B. only one parent has a mutant ? chain gene since mutation is dominant.
C. both mother and father are carriers of a mutant ? chain gene.
D. only one parent has a mutant ? chain gene since mutation is dominant.
E. both parents carry a mutant hemoglobin gene and are highly susceptible to malaria.


C

Biology & Microbiology

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Which amino acid would Nirenberg and Leder have found when they used the triplet UAG?

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The primary role of a cytokinin is

a. fruit drop b. cell division c. fruit ripening d. promote flowering e. stress response

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Cell surface receptors that are able to create mechanical stability by tethering cells to the extracellular matrix (ECM) are known as

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