Transferring Euglena into a dark environment results in the loss of photosynthetic pigment. What conclusion does this support?
A. Euglenoids are neither plant-like or animal-like protists.
B. Euglenoids are closely related to plants.
C. Euglenoids are obligate photoautotrophs.
D. Light triggers heterotrophy.
Answer: A
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Defensins act against bacteria and fungi by permeabilizing cell membranes.
Answer the following statement true (T) or false (F)
Uplift and formation of a mountain range divides a freshwater snail species into two isolated populations. Erosion eventually lowers the mountain range and brings the two populations together again, but when they mate, the resulting hybrids all produce sterile young. This scenario is an example of
a. sympatric speciation b. punctuated equilibrium c. allopatric speciation d. the gradual model of speciation
Superoxide ion is toxic to strict anaerobes because they lack
a. catalase b. peroxidase c. dismutase d. oxidase
DNA encoding a normal gene is inserted into cells from a patient with a defective form of the gene. Recombinant cells are identified and isolated, and returned to the patient's body. This is an example of
A) gene therapy. B) genomics. C) genetic mapping. D) genotyping. E) biotechnology.