An insect population that becomes resistant to a commonly used insecticide is an example of ________.
A. natural selection
B. a founder effect
C. disruptive selection
D. genetic drift
E. gene flow
Answer: A
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Consider the following points: (a) All excavates live in environments where oxygen availability is low; (b) all excavates lack mitochondria;
and (c) all excavates have some mitochondrial genes. Based on this information, which of the following statements is true of the excavate lineage? A) Their ancestors were eukaryotes that existed prior to the origin of mitochondria. B) Their ancestors had mitochondria, but the mitochondria were lost over time. C) Their ancestors were not able to metabolize glucose. D) Excavates are in the process of acquiring mitochondria through evolutionary adaptation.
Which of the following best describes the basis for separation of DNA fragments during agarose gel electrophoresis?
A. The largest fragments will migrate fastest. B. The fragments with the highest percentage of A and T will migrate fastest. C. The smallest fragments will migrate fastest. D. The fragments with the highest percentage of G and C will migrate fastest.
The gray crescent is
a. formed where the sperm penetrates the egg. b. formed opposite from where the sperm enters the egg. c. the portion of the egg where the yolk is found. d. located next to the vegetal pole of the egg. e. the point where the first cleavage occurs.
Lipids with unsaturated fatty acids
a. decrease the fluidity of membranes. b. increase the charge associated with the inner face of a membrane. c. increase the fluidity of membranes. d. are present only on the inner side of the plasma membrane.