Which of the following is incorrect regarding the complement fixation test?
A.) first antigen and antibody are allowed to react
B.) purified complement proteins are added to the antigen-antibody tube
C.) sheep red blood cells are added to the antigen -antibody-complement mixture
D.) hemolysis of the sheep red blood cells occurs in a positive test result
D.) hemolysis of the sheep red blood cells occurs in a positive test result
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Which isolating mechanism is postzygotic?
A. hybrid sterility B. behavioral isolation C. ecological isolation D. mechanical isolation E. temporal isolation
What is the first step in seed germination?
a. emergence of the embryonic root b. diffusion of water into the seed c. hydrolysis of starch d. meristem cells divide rapidly e. cotyledons emerge from the seed
Native Americans were able to prevent the encroachment of trees and maintain the tallgrass prairies by
A) establishing an extensive irrigation system to increase soil moisture, thus favoring grasses. B) plowing much of the land for agriculture. C) clear-cutting the forests for timber and fuel. D) setting fires periodically to kill the trees. E) restricting the migrations of bison, which caused the bison to browse heavily on tree seedlings and thus kill them.
Which of these is not gametic isolation?
A) Female stigma destroys germinating pollen grain. B) Lily sperm cannot fertilize tulip eggs. C) Male and female sex organs do not fit together. D) Pollen grain does not germinate on stigma (female structure).