If a strain of bacteria had a mutation that blocked expression of the lac repressor, what would you expect as a result?
A. The mutant strain would act the same, because it would still require lac activator protein to turn on.
B. The mutant strain would waste energy producing enzymes in the absence of lactose.
C. The mutant strain would grow at the same rate as wild-type if lactose was not present.
D. The mutant strain would outcompete wild-type strains, since it could always utilize lactose.
Answer: B
You might also like to view...
DNA replication is highly accurate. It results in about one mistake per billion nucleotides. For the human genome, how often would errors occur?
A) on average, once or twice in the lifetime of an individual B) on average, six times each time the entire genome of a cell is replicated C) on average, once every six cell divisions D) on average, once a lifetime in 10 percent of the population
As deoxygenated blood (blood lacking oxygen) enters the heart, list the following structures in the
correct order.
A. aorta B. left atrium C. left ventricle D. lungs E. pulmonary arteries F. pulmonary veins G. right atrium H. right ventricle 1. first structure 2. second structure 3. third structure 4. fourth structure 5. fifth structure 6. sixth structure 7. seventh structure 8. eighth structure
Birds utilize countercurrent mechanisms to optimize diffusion of O2 across their respiratory surfaces
Indicate whether the statement is true or false.
Euglena have chloroplasts and can perform phagocytosis. Euglena would be considered which of the following?
A. autotrophs and heterotrophs B. heterotrophs and detritovores C. autotrophs D. heterotrophs E. detritovores