After glycolysis but before the citric acid cycle
A) pyruvate is oxidized.
B) a carbon atom is added to pyruvate to make a four-carbon compound.
C) coenzyme A is cleaved off pyruvate.
D) glucose is split, producing two molecules of pyruvate.
Answer: A
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The presence of a tympanic membrane in insects and vertebrates is an example of:
A. divergent evolution. B. coevolution. C. convergent evolution. D. adaptive radiation.
Potassium-40 is useful in determining the age of a fossil in samples
A. 300,000 years of age and older. B. aged between 100,000 and 250,000 years. C. aged between 50,000 and 100,000 years. D. less than 50,000 years of age. E. less than 25,000 years of age.
Why is it easy to measure allele frequencies in a codominant allele system?
A. Such systems are rare. B. Phenotypes are equivalent to genotypes. C. Most alleles are present in homozygous condition. D. They are present in a 1:2:1 ratio in all populations. E. None of these is true.
Osteoporosis is a common condition that essentially results when homeostasis cannot be maintained in ________ and ________
A) osteoclasts; osteoblasts B) osteoblasts; osteons C) chondroblasts; osteoclasts D) canaculi; chondroblasts E) canaculi; osteoclasts