What term refers to clusters of bacterial genes that are under the control of a single regulatory region?
A) autotroph B) attenuation C) allosteric D) operon E) prototroph
Answer: D
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If one compares the forearm of a human, dog, bird, and whale and finds that they indicate common ancestry, what would we call these structures?
a. vestigial structures b. archetype features c. homologous structures d. ancestral forms
The boreal forest, or taiga, is characterized by which of the following dominant plants?
a. palms b. deciduous trees c. grasses d. conifers
Clay is considered a possible site for early polymerization because it binds organic monomers and
contains zinc and iron ions that may have functioned as ATP, _______________ Indicate whether the statement is true or false.
Occasionally, chromosomes fail to separate during meiosis, leading to daughter cells that have an abnormal number of chromosomes. This phenomenon is called
A. nondisjunction. B. epistasis. C. pleiotropy. D. chromosome inactivation. E. crossing over.