Segments of polypeptides that are retained following protein splicing are called

A) introns.
B) exons.
C) inteins.
D) exteins.
E) cleaved.


D) exteins.

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

The fusion of two gametes produces a

A) zygote. B) schizont. C) chromatid. D) centromere. E) merozoite.

Biology & Microbiology