The immunoglobulin class that has an Fc region that binds to receptors on basophils and mast cells is ________.
A. IgE
B. IgA
C. IgD
D. IgG
E. IgM
Answer: A
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The chemical composition of urine reflects the processes of
A. filtration. B. reabsorption. C. secretion. D. concentration. E. All of the answer choices are correct.
The gases O2 and CO2 enter or leave a plant cell by
A) facilitated diffusion. B) simple diffusion. C) active transport. D) osmosis. E) facilitated transport.
You are performing an experiment to study replication of DNA in E. coli. Replication initiation was synchronized and DNA was recovered every 5 minutes and an analysis was done to look for DNA replication in specific regions of the E. coli chromosome. Assume that these regions of the chromosome are adjacent to each other in the following order: Region A, Region B, Region C, Region D. The data below indicate the times during which DNA replication was observed in each of these regions. Using these data, which region or regions of the bacterial chromosome most likely contained an origin of replication?Times When DNA Replication Was Observed in Each Region:Region A: 40 minutes, 45 minutes, and 50 minutesRegion B: 35 minutes, 40 minutes and 45 minutesRegion C: 30 minutes, 35 minutes,
and 40 minutesRegion D: 35 minutes, 40 minutes, and 45 minutes A. region A B. region B C. region C D. region D E. regions A, B, C, and D
Which of these is not a form of kinetic energy?
A) a cyclist pushing the pedals of a bike B) a condor flapping its wings C) a ball rolling down a hill D) a covalent bond linking phosphate molecules E) a runner, sprinting toward the finish line