While trying to start an IV on a patient, Kurt received a needlestick injury and blood exposure involving a patient with AIDS. He was immediately started on three different antiretroviral medications. The advantage of using combined therapy in this circumstance is
A. the duration of treatment is much shorter.
B. cost savings to the patient.
C. this should prevent the emergence of drug-resistant microbes.
D. the drugs only work if given together.
Answer: C
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The following question(s) relate to the data table below, showing typical fluctuating pH and dissolved oxygen levels in a fish pond with a heavy concentration of algae over a 24-hour period.TimeOxygen (ppm)pH2 a.m.4.57.74 a.m.2.87.26 a.m.2.26.88 a.m.2.56.810 a.m.3.97.2Noon6.57.72 p.m.10.08.34 p.m.12.18.86 p.m.13.19.28 p.m.13.09.210 p.m.12.08.8Midnight10.88.3In such a pond that contains algae and fish, what processes are happening?
A. Only cellular respiration is happening, carried out by both the algae and the fish B. Only photosynthesis is happening, carried out by the algae C. Both photosynthesis (carried out by the algae) and cellular respiration (carried out by the fish) are happening D. Both photosynthesis (carried out by the algae) and cellular respiration (carried out by both the algae and the fish) are happening
The beads-on-a-string form of DNA condenses into a compact fiber called the 30 nm filament. Which of the following is true about its formation?
A. Histone H1 is essential for formation of the 30 nm filament. B. The histone tails of the octamer histones are absolutely required for filament formation. C. The zigzag model describes how the nucleosome array adopts a spiral shape when forming the filament. D. The 30 nm filament is also called a tetranucleosome. E. The linker histone is essential for formation of the 30 nm filament.
The figure is a __________ microscope
photomicrograph. a. standard light b. phase contrast c. Nomarski process light d. transmission electron e. scanning electron
Which of the following statements about phenylketonuria (PKU) is false?
A) Buildup of phenylpyruvic acid affects the nervous system. B) The amino acid tyrosine cannot be made. C) Production of the hormone thyroxin s affected. D) The skin color of those with phenylketonuria is light because of decreased levels of melanin. E) Adrenalin levels increase in the blood stream.