The ________ lactose is often used as a substrate for penicillin production.
A. disaccharide
B. trisaccharide
C. more complex molecule
D. monosaccharide
Answer: A
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Looking out your window, you may notice that the bark of a nearby oak tree has a mosaic appearance, consisting of deep fissures and relatively flat areas. What accounts for this mosaic appearance? Select all correct choices
A. the formation of new cork cambia as old cork cambia grow away from the phloem B. the formation of new secondary phloem in distinct, discontinuous patches C. the formation of new cork cambia in distinct, discontinuous patches D. the formation of new vascular cambia as old cork cambia grow away from the phloem
The radioactive decay of carbon-14 can be used to determine ____
a. relative dating b. absolute dating c. mutation rates d. plate tectonics e. extinction rates
What is the order of these three genes on the chromosome?
What will be an ideal response?
For women with a mutated BRCA gene, the risk of breast cancer is about 60%. However, detection of the mutated gene can occur before cancer ever develops by
A) testing of a blood sample. B) screening mammography. C) taking a biopsy of breast tissue. D) a PET scan. E) urinalysis.