How many species normally go extinct each year, as estimated by scientists?
A) 1 species per thousand per year
B) 1 species per million per year
C) 1 species per billion per year
D) 1 species per year
B
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Based on what the chapter describes about the melting temperature of fatty acids, which of the following would be likely to increase the stability of a lipid bilayer?
A. an increase in unsaturated fatty acids B. an increase in saturated fatty acids C. a decrease in overall tail length D. an increase in unsaturated fatty acids and an increase in saturated fatty acids E. an increase in saturated fatty acids, and a decrease in overall tail length
Joshua is colorblind, but neither of his parents are colorblind. Which of the following is the
most likely scenario?
a. He is adopted. b. His mother is a carrier for the colorblind trait. c. His father is heterozygous for the colorblind trait. d. His father must be colorblind
Which of the following does NOT describe phylum Ascomycota?
A. They are limited to only asexual reproduction. B. Morel mushrooms are members of this phylum. C. The fruiting body is known as an ascocarp. D. They use conidiospores during reproduction.
In an immunodiffusion test to diagnose the fungal disease histoplasmosis, a patient's serum is placed in a well in an agar plate. In a positive test, a precipitate forms as the serum diffuses from the well and meets material diffusing from a second well. In this test process, what is the most likely identity of the material in the second well?
A) antibodies B) a purified fungal antigen C) entire fungal cells D) a purified protozoan antigen E) red blood cells