Which statement is true for scyphozoan medusae?
a. They are the dominant body form.
b. They are generally smaller than hydrozoan medusae.
c. Most live in freshwater.
d. They are scavengers.
d
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Integration of linear transforming DNA into the chromosome
A) is not required for the expression for the transformed genes. B) is catalyzed by the RecA gene. C) almost never occurs because restriction endonuclease will degrade the DNA before it is integrated. D) only occurs in laboratory-based systems in artificial competent cells.
What type of regulatory transcription factor binds DNA and increases the transcription of a gene?
A. a repressor exerting negative control B. a repressor exerting positive control C. an activator exerting negative control D. an activator exerting positive control E. a combination of both a repressor and activator exerting negative control
Choose the organism from the list below that best fits each of the following descriptions.
A. euglenozoans B. Chlamydomonas C. dinoflagellates D. stramenopiles E. diplomonads
Evolutionary relationships between organisms are determined by
A. molecular evidence, anatomical homologies, anatomical analogies, and fossil records B. molecular evidence and fossil records C. molecular evidence, anatomical analogies, fossil records D. molecular evidence, anatomical homologies, and fossil records. E. molecular evidence and anatomical homologies