The molecule in the accompanying figure is the pyrimidine ____, which is typically found in both DNA and RNA
a. thymine
b. adenine
c. uracil
d. guanine
e. cytosine
ANSWER: e
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Numerous hypotheses have been proposed for the mass extinction of about 60% of all species, including nearly all the dinosaurs, about 65 million years ago. Evidence has been found of the impact of a large meteor at about the time of this mass extinction. The amount of dust and debris put into the atmosphere upon impact, as well as atmospheric heating, would have been enormous. Using your knowledge of photosynthesis, speculate about why the dinosaurs subsequently became extinct.
What will be an ideal response?
Sanitary landfill
What will be an ideal response?
The normal RB gene product functions as
A) a transcription factor. B) a signaling pathway protein. C) an apoptosis pathway protein. D) a cell-surface receptor. E) a cell-cycle protein.
Which proteins are encoded by genes that code for the first mRNAs transcribed in Drosophila embryos?
A. Morphogen proteins B. Caudal and Hunchback proteins C. Dorsal proteins D. Gap and Pair-rule proteins E. Bicoid and Nanos proteins