Penicillin G is frequently injected but not normally given orally because it is rapidly degraded in the stomach.
Answer the following statement true (T) or false (F)
True
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A researcher wants to introduce the human gene encoding tissue plasminogen activator (used to dissolve blood clots) into a mammal so that the protein will be secreted into the milk of the mammary gland. What is required for the researcher's success?
A. The gene should be placed a considerable distance away from the promoter of a gene that is expressed in mammary cells. B. The gene should be placed next to the promoter of a gene that is expressed in mammary cells. C. The gene should be placed a considerable distance away from the promoter of a gene that is expressed in multiple types of cells. D. The gene should be placed next to the promoter of a gene that is expressed in multiple types of cells. E. The gene should be inserted in place of the promoter of a gene that is expressed in multiple types of cells.
The chemical digestion of which macromolecule occurs in the mouth?
a. carbohydrates b. proteins c. lipids d. all of these
The bones in bat wings and those in the human arm are ____
a. homologous structures b. comparative structures c. analogous structures d. repetitive structures e. vestigial structures
According to Oparin's theory for the origin of life, the prebiotic atmosphere:
A) already contained some primitive RNA molecules. B) basically was very similar to the atmosphere of today. C) contained many amino acids. D) had an abundance of methane, ammonia, and water. E) was rich in oxygen.