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
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
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)