Which characteristic will NOT strengthen the validity of a theory?
a. repetitions of experiments
b. increased observations
c. time after the experiment
d. faith in the experiment
e. confirmation by many scientists
ANSWER: d
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Two genes within an organism that arose from the duplication of a single gene in an ancestor are ________________.
Fill in the blank(s) with the appropriate word(s).
Using phages to treat a bacterial infection is an interesting idea because
A. a single type of phage can destroy a wide range of strains of the same pathogen. B. of the increasing problem of antibiotic resistance. C. lysed bacteria pose no threat. D. a single phage can be genetically engineered to infect many different species of bacteria.
The only important role of sunlight in the marine environment is to provide energy for photosynthesis
Indicate whether the statement is true or false
Rapid turgor pressure changes in specialized multicellular swellings called ________ are associated with leaves that move in response to touch or light.
A. pudicas B. pulvini C. petioles D. stipules E. coleoptiles