Precarcinogens are themselves not carcinogens but may be activated to become a carcinogen in the liver by the activity of

A) PTEN.
B) Ras.
C) EGF.
D) Cytochrome P450.
E) APC.


Answer: D

Biology & Microbiology

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The body symmetry of adult echinoderms could best be described as ________.

A. fivefold symmetrical B. fourfold symmetrical C. bilateral D. asymmetrical

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In which condition are both alleles expressed in the heterozygous phenotype?

A) pleiotropy B) codominance C) epistasis D) complete dominance

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Fermenting organisms make ATP through the process of ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The nucleic acid that delivers the correct amino acid to the ribosome for protein synthesis is

A. DNA. B. rRNA. C. tRNA. D. mRNA. E. ATP.

Biology & Microbiology