In the lac operon, the protein that binds to the operator to prevent transcription is
the repressor.
RNA polymerase.
DNA polymerase.
the promoter.
lactose.
the repressor.
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How did Zhang and Cech purify the RNA molecules that were able to catalyze the linkage between two amino acids?
a. passing the reaction mixture through a column that binds biotin b. passing the reaction mixture through a column that binds all proteins c. passing the reaction mixture through a column that binds RNA d. centrifuging the reaction mixture to concentrate the proteins e. centrifuging the reaction mixture to concentrate the RNA molecules
People opposed to stem cell research argue that it is unethical to collect embryonic stem cells because it usually preserves an embryo. If False, change it.
a. true b. false
The Grants' finch research included morphological, geographic, genetic, and ecological data. Which of these could not be directly determined by examining the birds as they tagged them?
A) Morphological measurements could be directly made of bird size and weight in addition to measurements on beak depth. B) Geographic data could be directly recorded according to where on the island the bird was found. C) Complete genetic makeup could be directly determined though analysis of phenotypes. D) Ecological data could be gathered by direct observation of food preference.
If each skin cell of an organism has 24 chromosomes, its gametes must also have 24 chromosomes.
a. true b. false