Which of the following is a tumor suppressor gene?
a. p21
b. p57
c.RB3
d. Cdk
a. p21
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A change in a nucleotide sequence that results in addition or deletion of a single nucleotide and largely changes the amino acid sequence of the resulting peptide is known as a
A) nonsense mutation. B) silent mutation. C) missense mutation. D) frameshift mutation. E) none of the above
Which of the following tissue types is specialized to conduct electrical signals?
A. Nervous B. Muscle C. Epithelial D. Connective E. Both nervous and epithelial tissue are correct.
Splicing of mRNA ____
a. takes place in the nucleus
b. involves removing the nucleotide cap c. involves removing exons leaving behind introns d. occurs prior to transcription e. occurs after translation
Which of the following correctly pairs two homoplastic features from Figure 18-1?
a. 1 and 4
b. 2 and 7
c. 3 and 6
d. 2 and 4
e. 1 and 5