In the human species, a heterozygote advantage is demonstrated by which condition?
a. albinism
b. hemophilia
c. Down syndrome
d. sickle cell anemia
e. Klinefelter syndrome
b
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Kinases are enzymes that can phosphorylate (transfer phosphate groups onto) macromolecules such as proteins. A particular kinase, Kinase 1 is known to promote cell division. It promotes cell division by phosphorylating Protein X. Phosphorylation of Protein X activates Protein X. Once activated, Protein X stimulates the production of other proteins such as Protein Y and Z that directly promote
cell division. In order to function, Kinase 1 requires the presence of Metal A. However, in the presence of Protein A, Kinase 1 is nonfunctional. From the description, what is considered the substrate of Kinase 1? A. Protein X B. Protein Y C. Protein Z D. Metal A E. Protein A
Acid-fast smears should be examined carefully by scanning at least ________ oil immersion fields
a. 100 b. 200 c. 300 d. 400
Megaspores
a. are haploid. b. produce the embryo sac. c. produce gametophytes. d. are female. e. fit all of these descriptions.
The comparison of embryos across species reveals the conservative nature of the genes responsible for ____.
A. food procurement B. reproductive behavior C. embryonic development D. embryonic size E. embryonic intelligence