In reference to diffusion, passive really means
A) in the air.
B) very slowly.
C) no gradient.
D) without a membrane.
E) no energy required.
E
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Nematode worms and annelid worms share which of the following features?
A) a digestive tract with two openings (a mouth and an anus) B) molting C) presence of a circulatory system D) presence of segmentation E) absence of species with parasitic lifestyles
Which one of the following biological polymers is defined by a physical property rather than a chemical structure?
A. proteins B. lipids C. monosaccharides D. nucleic acids E. polysaccharides
A study of certain nuclear genes in humans and chimpanzees shows that the two species differ in 5 percent of their DNA bases. Base substitution mutations occur at a rate of 1 percent per one million years. How many million years ago did these species diverge?
A) 0.5 B) 1 C) 3 D) 5
Which lineage do salamanders belong to?
a. Gymnophiona b. Aves c. Urodela d. Anura