If there were 75 naturally occurring amino acids then what is the smallest codon size?
A) 1 B) 2 C) 3 D) 4 E) 5
Answer: D
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Virginia was working as an undergraduate lab technician, and the graduate student she was working with instructed her to take some E. coli, and treat the culture with MgCl2 and CaCl2 to make the cells competent. Once Virginia produced the competent cells, she was able to
A. make them replicate their own DNA without an origin of replication B. make them susceptible to bacteriophage C. make them pass their DNA to a recipient cell via conjugation D. make them take up naked DNA from their environment E. None of these are correct
The digestion of which class of foods begins in the mouth?
a. carbohydrates b. proteins c. lipids d. amino acids e. nucleic acids
Which of the following relationships is correct?
a. insects: Malpighian tubules: urea as major nitrogenous waste b. annelids: protonephridia: ammonia as major nitrogenous waste c. freshwater fish: kidney: large volume of hypertonic urine d. sharks: kidney: large volume of hypotonic urine e. earthworm: kidney: ammonia as major nitrogenous waste
In its non-phosphorylated state, the retinablastoma protein (Rb) binds to and inhibits the activity of:
A. cyclin D B. the E2F transcription factor C. cyclin-dependent kinase D. p53