Human insulin, which does not provoke allergic reactions, has been produced by transgenic E. coli since ____.
A. 1952
B. 1962
C. 1972
D. 1982
E. 1992
Answer: D
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Suppose researchers marked 800 turtles and later were able to trap a total of 300 individuals in that population, of which 150 were marked. What is the estimate for total population size?
A) 200 B) 1050 C) 1600 D) 2100
Compare and contrast the mechanism of action of a steroid and a protein-type hormone at the cellular level. What will be an ideal response?
Each actin molecule is shaped like a golf club, with a straight portion ending in a globular head.
Answer the following statement true (T) or false (F)
Carbon-14 dating is best used for determining ages of ________
a. metamorphic rock samples 2 to 3 billion years old b. carbon-containing samples less than 100 years old c. igneous rock samples 3 to 4 billion years old d. carbon-containing samples less than 60,000 years old