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

Biology & Microbiology

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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

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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

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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.

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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.

Biology & Microbiology