What nitrogenous bases is found in DNA but not in RNA?

What will be an ideal response?


Thymine

Biology & Microbiology

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Both extremes of an array of phenotypes are favored in _____ .  

A.  directional selection B.  genetic drift C.  gene flow D.  disruptive selection E.  stabilizing selection

Biology & Microbiology

Four of the five habitats listed below favor fossil

preservation. Select the exception. a. deserts b. swamp c. tar pits d. seafloor e. caves

Biology & Microbiology

Which of the following occurs during gastrulation?

a. formation of the gray crescent region b. formation of ectoderm, mesoderm, and endoderm c. closure of the archenteron d. formation of the blastocoel e. radial cleavage takes place

Biology & Microbiology

Which of the following is required for transposition?

A) F+ plasmid B) bacteriophage C) insertion sequence D) donor cell E) competence

Biology & Microbiology