Why is the fossil record not a complete catalog of biological history?
A. Not all organisms fossilize with equal
probability.
B. Fossilization destroys the structure of
DNA.
C. The process of fossilization often destroys
anatomical features of the organisms being
preserved.
D. Fossils only preserve organisms for about
10 million years; older organisms are
destroyed by geological processes.
E. Only animals, not plants, are fossilized.
A
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The endosymbiont theory is supported by all of the following evidence except for which statement?
A. Mitochondria are surrounded by two membranes. B. Mitochondria have a matrix. C. Mitochondria divide by binary fission. D. Mitochondria contain circular molecules of DNA. E. Mitochondrial ribosomes are similar to bacterial ribosomes.
The electrons lost from the reaction center of photosystem II are replaced by electrons from
A) CO2. B) ATP. C) H2O. D) photosystem I.
A karyotype reveals that a woman is carrying a fetus that has 47 chromosomes. The test reveals that the genotype of the fetus is XXY. Which of the following statements is correct?
A) The fetus has Turner syndrome, and most likely a nondisjunction event occurred in the mother during egg formation. B) The fetus has Down syndrome, and most likely a nondisjunction event occurred in the mother during egg formation. C) The fetus has Klinefelter syndrome. D) The fetus has an autosomal disorder.
In which of the following is countercurrent heat exchange not known to occur?
A) porpoise fluke B) beaver tail C) bird legs D) primate hands