A pile of castings outside the burrow of a polychaete indicates it
a. has just dug a burrow.
b. has completed a meal of other worms.
c. is a filter feeder.
d. is a selective deposit feeder.
e. is a nonselective deposit feeder.
E
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During the S phase of interphase, the state of a eukaryotic chromosome can be described as
A) a single continuous linear double helix. B) a double helix replicating semiconservatively. C) a double helix replicating conservatively. D) a triple helix replicating semiconservatively. E) two linear single-stranded molecules.
Rosalind Franklin's X-Ray diffraction images taken in the 1950s most directly support which of the following claims about DNA?
A) The ratio of base pairs are constant. B) The nucleotide sequence determines genetic information. C) The two strands of DNA are anti-parallel D) The basic molecular structure is a helix
Mitochondria differ from chloroplasts in that mitochondria
A) convert light energy from the sun to chemical energy, whereas chloroplasts convert one form of chemical energy to another. B) contain three different membrane-bound compartments, whereas chloroplasts contain two. C) contain membrane folds called cristae, whereas chloroplasts contain disklike vesicles in stacks called grana. D) are not found in plants, whereas chloroplasts are not found in animals.
Dimpled cheeks are dominant to undimpled cheeks. If there exists a 50 percent chance that a child will have dimpled cheeks, the parental genotypes must be:
A) Dd and dd. B) dd and dd. C) DD and dd. D) Dd and Dd. E) DD and Dd.