The atoms that make up the molecules in our bodies
A) will be lost back to space soon after we die.
B) have nearly all been on Earth throughout its entire history.
C) were once part of a dinosaur.
D) were all formed recently by nuclear fusion on the sun.
E) came from a wooly mammoth.
B
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Purine bases, such as adenine and guanine, have ________ joined ring(s) for their structure, compared to pyrimidine bases, such as cytosine and thymine, that have ________ ring(s) in their structure.
Fill in the blank(s) with the appropriate word(s).
Studies on which experimental organism led to the discovery of the gene controlling development of the animal body plan?
a. Dictyostelium discoideum b. Drosophila melanogaster c. Xenopus laevis d. Mice
How is a eukaryotic cell different from a prokaryotic cell?
The end product of glycolysis is
A) one lactate molecule. B) two pyruvate molecules. C) one G3P molecule. D) two NAD+ molecules. E) two citric acid molecules.