Which of the following is not a characteristic of epithelial tissue?
A. The layers consist of loosely packed cells.
B. It lines the covering of hollow organs.
C. It lines the covering of the inside of hollow organs.
D. It anchors to other tissue by an extracellular matrix.
E. Adjacent cells in the tissue are connected by tight junctions.
A. The layers consist of loosely packed cells.
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Which of the following is an example of a connective tissue?
A) the surface of the skin B) nerves C) blood D) cuboidal epithelium E) smooth muscles
Based upon shared features, which two species have the closest evolutionary relationship?
a. Mice and humans b. Lizard and humans c. Mice and worms d. Lizards and worms e. Fish and humans
The wild-type coat color, agouti (AA) is dominant to solid-colored fur (aa). However, a separate gene C, when present as the recessive homozygote (cc), negates any expression of pigment from the A gene and results in an albino mouse. Therefore, the genotypes AAcc, Aacc, and aacc all produce the same albino phenotype. A cross between heterozygotes for both genes (AaCc x AaCc) would generate offspring with a phenotypic ratio of 9 agouti:3 black:4 albino. Which type of gene interaction is this?
a. Complementary gene interaction. b. Duplicate gene interaction. c. Dominant gene interaction. d. Recessive epistasis. e. Dominant epistasis.
The immediate results of the widespread use of pesticides and fertilizers included ________, but long-term results included ________
A) dramatic increases in crop yields; the evolution of pest resistance B) the increased spread of malaria; delayed resistance to pesticides C) global declines in agricultural productivity; worldwide distribution of DDT D) global declines in undesirable pests such as mice and rats; increases in these pests