The 3? end of eukaryotic pre-mRNAs are changed by:
a. removing the last phosphate group.
b. adding a "cap."
c. copying the last few bases so that it can form a duplex structure.
d. adding 100?250 adenine nucleotides.
e. phosphorylation of the mRNA molecule
d
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A squirrel living in a park bisected by a busy street passes on a mutation to its offspring that allows them to judge the speed and distance of passing cars more accurately based on the vibration they cause in the ground. Over several generations, the percentage of squirrels expressing this mutation increases equally on both sides of the street. What principle does this demonstrate?
a. founder effect b. genetic drift c. microevolution d. equilibrium
48. If a person is treated with a single anti-HIV drug, they often end up with a resistant strain. How does this occur?
A. The HIV wants to avoid the drug, so it becomes resistant. B. The drug causes mutations in the HIV, making them resistant to the drug. C. All of the answer choices are correct. D. The drugs kill all sensitive viruses, leaving only the preexisting resistant viruses. E. The drugs weaken the immune system, making a patient more susceptible to infection with resistant strains of HIV.
Steroid hormones typically move across the cell and nuclear membranes to bind to receptors in the nucleus
Indicate whether the statement is true or false
Examples of cytopathic effects of viruses are
A) inclusion bodies B) giant cells C) multiple nuclei D) all of the above