In recombinant DNA experiments, ______ is used to cut pieces of DNA, and ______ joins these segments to form recombinant DNA
A. restriction enzyme; DNA ligase
B. a transposon; a restriction enzyme
C. a plasmid; DNA ligase
D. DNA ligase; a restriction enzyme
E. DNA ligase; a plasmid
A
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Which statement best summarizes the results of the experiment by Damschen and her colleagues on the effect of
landscape corridors on species richness?
a. Habitat patches with landscape corridors are at higher risk of encroachment by exotic species than are isolated habitat patches. b. Over time, the number of native species harbored by habitat patches with landscape corridors was increasingly greater than in isolated habitat patches. c. The number of both native and exotic species increased over time in habitat patches that were connected by landscape corridors. d. The number of native species increased over time in isolated habitat patches but not in those connected by corridors. e. The number of exotic and native species decreased in patches connected by landscape corridors.
Four of the five answers listed below are characteristic of meiosis. Select the exception
a. involves two divisions b. reduces the number of chromosomes c. results in producing genetically identical cells d. produces haploid cells e. occurs in the gonads
Plants, algae, and certain prokaryotes are:a
photoheterotrophs b. chemoheterotrophs. c. chemoautotrophs. d. independent trophs. e. photoautotrophs.
Suppose that purple is dominant in pea plants. What will be the result of a cross between P generation purple and white plants?
a. all white flowers in the F1 generation b. all purple flowers in the F1 generation c. all purple flowers in the F1 generation, but a lighter purple than in the parents d. mostly purple flowers in the F1 generation, with an occasional white flower