Radiometric dating
a. is based on the premise that each isotope decays
at a constant rate.
b. is unpredictable because changes in temperature
and pressure alter the results.
c. can be used to date sedimentary rock.
d. has a large error factor.
e. is used for dating only recent fossils.
Answer: a
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Why is insulin produced by genetically engineered E. coli cells superior to insulin obtained from animal sources?
a. Animal insulin has a shorter life span than insulin produced using recombinant DNA techniques. b. Recombinantly produced insulin contains human rather than animal sequences, reducing the chances of an allergic response. c. Animal insulin is more difficult to purify than recombinantly produced insulin. d. Recombinantly produced insulin has a much higher activity level. e. Recombinantly produced insulin is easier to obtain than insulin from animals.
Hydrogen bonds
A. result in the formation of salts. B. result from the loss of neutrons by an atom. C. involve the sharing of electrons. D. are relatively weak and can be broken rather easily. E. involve the loss and gain of electrons.
________ is the final product to be expelled from the body after the kidney has reabsorbed needed nutrients and water.
Fill in the blank(s) with the appropriate word(s).
As a general rule, for each jump up in trophic level, about how much does the available energy drop?
A) 90 percent B) practically 100 percent C) 30 percent D) 50 percent E) 10 percent