Radiometric dating shows that Archaeopteryx lived
__________ million years ago.
a. 50
b. 150
c. 250
d. 350
e. 450
Answer: b
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Which of the following is the best description of a precursor metabolite?
A. A macromolecule consumed in the first steps of metabolism B. A carbon skeleton used as a starting substrate C. An enzyme that is reduced in a metabolic reaction D. An intermediate in the formation of cursor metabolites
When differentiation occurs, cells may also change in
_____ genetic content. _____ size. _____ shape.
If a DNA fragment is 21,000 bp long, about how many DNA fragments would result after incubation with EcoRI?
A. 3 B. 5 C. 10 D. 20 E. 100
While on an archaeology expedition, you unearth a skeleton with the following characteristics: four long, slender finger bones and a smaller opposable thumb bone, long arm bones, fingernails, and eye sockets close together on a skull
What type of organism do you suspect you may have found? A) an anthropoid B) a tarsier C) a crustacean D) a marsupial