During microscopic examination of potential cancer cells, some of the cells are graded as anaplastic. This means they
A) divide slowly.
B) are easily identified to tissue of origin.
C) are poorly differentiated.
D) respond well to chemotherapy.
E) are not aggressive.
C) are poorly differentiated.
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The evolution of insect wing patterns is best explained by
A. a new gene mutation. B. the modification of an existing gene for a new function. C. homoplastic convergence. D. gene duplication and divergence. E. conserved genes.
Pyrimidines and purines can exist in alternate forms, or tautomers, shown here. Under common cellular conditions (physiological pH) the most common form of each purine or pyrimidine is shown on the left, and the rare tautomer on the right
Tautomers differ in the placement of hydrogen atoms and double bonds. Consider cytosine and its tautomer, the rare imino form of cytosine. With which nitrogenous base will the imino form of cytosine most likely base pair in a double stranded DNA? A. adenine B. cytosine C. guanine D. thymine E. uracil
The organisms isolated from hydrothermal vents are typically
A. phototrophs. B. chemolithoautotrophs. C. rhizobia. D. bacteroid. E. phototrophs, rhizobia AND bacteroid.
________ is the living and dead particles of plankton connected by strands of mucous
a. Marine snow b. Pleuston c. Tripton d. Neustron