An insect population that becomes resistant to a commonly used insecticide is an example of
A. a founder effect.
B. genetic drift.
C. inheritance of acquired characteristics.
D. disruptive selection.
E. natural selection.
Answer: E
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_________ occurs when 50% of a protein produces a different phenotype than that produced by 100% or 0% of the protein.
A. Incomplete dominance B. Recessive inheritance C. Codominance D. Loss of function mutation E. Hybridization
In animals, a sphere of embryonic cells surrounding a fluid-filled cavity is called a
A. coelom. B. blastula. C. gastrula. D. hydrostatic skeleton. E. gastrovascular cavity
Which of the following is a characteristic of uracil?
a. It has the ability to bond with adenine. b. It has the ability to bond with guanine. c. It is a purine. d. It has the ability to bond with cytosine. e. It contains two nitrogenous rings.
Why is organ transplantation challenging?
A) Organs cannot be grown in the laboratory. B) T cells from the immune system attack transplanted tissue. C) Identical twins cannot donate organs to each other by law. D) To harvest a donor's organs, the donor needs to be dead for at least 24 hours.