How can transgenic organisms be used to identify transcriptional enhancers?
A) A reporter gene can be constructed so that its expression is controlled by an enhancer that may potentially exist within a fragment of genomic DNA.
B) A reporter gene can be expressed in every tissue.
C) A gene that is normally expressed in the organism can be cloned under the control of different regulatory elements so that it is expressed in all tissues.
D) A transgene can be integrated in a site that disrupts a gene to determine whether that gene is essential for the cell or organism.
A) A reporter gene can be constructed so that its expression is controlled by an enhancer that may potentially exist within a fragment of genomic DNA.
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Which of the following is responsible for the differences in summer and winter temperature stratification of deep temperate zone lakes?
A) Water is densest at 4 °C. B) Oxygen is most abundant in deeper waters. C) Winter ice sinks in the summer. D) Stratification is caused by a thermocline. E) Stratification always follows the fall and spring turnovers.
Are all nuclei the same size (diameter)?
a. Yes b. No
Farmers have been able to genetically engineer a wide variety of crops that possess an enormous diversity of traits. If a farmer wanted to increase the ability of his crops to access ground water that is several meters below ground which type of root system would he want?
A. aerial roots B. taproot C. fibrous roots D. pneumatophores E. prop roots
In science, theories tend to be ___________ than hypotheses.
A) more speculative B) less scientific C) more experimental D) broader in scope E) less reliable