which of the following accurately describes an operon?
A. a transcription unit that codes for 1 polypeptide and is controlled by one promoter and one terminator
B. a transcription unit that codes for several polypeptides zand is controlled by one promoter and one terminator
C. is present only in prokaryotes
D. both a and b
E. both b and c
E. both b and c
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The ____ are the most numerous type of leukocyte in a healthy individual
a. basophils b. eosinophils c. lymphocytes d. monocytes e. neutrophils
If a cell has completed meiosis I and is just beginning meiosis II, which of the following is an appropriate description of its contents?
A) It has half the amount of DNA as the cell that began meiosis. B) It has half the chromosomes but twice the DNA of the originating cell. C) It has one-fourth the DNA and one-half the chromosomes as the originating cell. D) It is identical in content to another cell formed from the same meiosis I event.
Which of the following is NOT a method to create fossils:
A. Coalification B. Carbonization C. Permineralization D,. Impression
Select the best choice for the following statements in reference to the classes listed below.
A. Members of this class have cartilaginous skeletons but also possess jaws. B. Members of one unusual group may have been ancestors of tetrapods. C. Members of this class are fully terrestrial except for reproduction. D. Some species of this class live in water but are not dependent upon an aquatic environment.