Which statement is true of all genetically engineered organisms?
A.) They have altered genomes
B.) They are implanted with the Bt gene
C.) They age more quickly than normal
D.) They contain bacterial genes
Ans: A.) They have altered genomes
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A microbiologist makes a fixed smear of bacterial cells and stains it with methylene blue. All cells appear blue under the oil immersion lens. This is an example of ________.
A. capsule staining B. the acid-fast stain C. simple staining D. using an acidic dye E. negative staining
Four of the five features listed below characterize a
group of chordates. Select the exception. a. feathers b. ectothermic c. four-chambered heart d. hollow skeleton e. no teeth
Whe considering receptors for hormone molecules, we can say that, in general, _________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about species, as defined by the biological species concept, is (are) correct?
I. Biological species are defined by reproductive isolation. II. Biological species are the model used for grouping extinct forms of life. III. The biological species is the largest unit of population in which successful reproduction is possible. A) I only B) II only C) I and III D) II and III E) I, II, and III