Segments of polypeptides that are retained following protein splicing are called
A) introns.
B) exons.
C) inteins.
D) exteins.
E) cleaved.
D) exteins.
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When a presented antigen fragment interacts with the T cell receptor of a helper T cell, the co-receptor that must also participate to finalize recognition is ________.
A. MHC I B. CD8 C. CD4 D. All of the choices are correct.
When researchers studied knockout mice with no active copies of the Dvl1 gene, they found these micewere____
a. physically abnormal b. socially normal c. not easily startled d. physically and sociallynormal e. physically normal, but socially abnormal
The observation that most aquatic animals, like fish, penguins, and whales, all have streamlined bodies and fins or flippers for steering are a result of
A. sexual selection. B. artificial selection. C. analogous selection. D. vestigial selection. E. convergent evolution.
The fusion of two gametes produces a
A) zygote. B) schizont. C) chromatid. D) centromere. E) merozoite.