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
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Which of the following is NOT part of the pathway that water and dissolved minerals (i.e., Fe, K, Mg, etc.) follow as they move from the soil into a plant to the xylem?
A. through plasmodesmata B. through phloem C. through apoplastic transport D. through symplastic transport E. between cells
Which amino acid would Nirenberg and Leder have found when they used the triplet UAG?
A. Isoleucine B. Proline C. Lysine D. Threonine E. None of these
The primary role of a cytokinin is
a. fruit drop b. cell division c. fruit ripening d. promote flowering e. stress response
Cell surface receptors that are able to create mechanical stability by tethering cells to the extracellular matrix (ECM) are known as
a) Adhesions. b) Fibrinogens c) Notch receptors d) Integrins