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.
b
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Plants and algae most recently shared a common ancestor 480 million years ago, and plants colonized land shortly after that. In sexual reproduction, an alga simply releases gametes into the water, and the current carries the sex cells to another individual. What adaptation arose in gymnosperms and angiosperms that allowed reproduction on dry land and over great distances?
A. development of stomata B. production of lignin C. development of vascular tissue D. production of pollen E. production of a cuticle
_______ describes a chromosome that has a centrally-placed centromere. Fill in the blank(s) with the appropriate word(s)
Which of the following is secreted by a sexually mature woman?
A) testosterone, only B) estrogen, only C) progestins, only D) All of these are secreted by a sexually mature woman.
In a polygynous mating system, you would expect to see:
A. One or a few males monopolizing multiple females B. A high degree of sexual dimorphism C. A high degree of sperm competition D. A and B E. All of the above