Rosalind Franklin used what method to understand the structure of DNA?
a. polymerase chain reaction
b. gel electrophoresis
c. X-ray diffraction
d. high-throughput sequencing
c. X-ray diffraction
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Chapter 43 described an important experiment by Otto Loewi that demonstrated the existence of chemical neurotransmitters. Loewi used frog hearts in dishes that exhibited a regular heartbeat even when disconnected from the rest of the body. This experiment would not have been possible if these hearts lacked
A. sinoatrial nodes. B. atrioventricular nodes. C. neurogenic pacemakers. D. cardiogenic pacemakers. E. atrioventricular valves.
If you take an antibiotic by mouth for a long period of time, you may become deficient in certain vitamins. How can this be true?
What will be an ideal response?
Which of the following would indicate that a home is using solar power to generate electricity and is NOT using batteries?
A- There are water pipes running to and from the solar panels on the home. B- There are small plumes of smoke drifting away from the solar panels on the home. C- There are solar panels on the roof and power lines going to the home. D- There are solar panels on the roof and NO power lines going to the home.
All of the following pertain to Clostridium difficile infection except
A. it is due to ingestion of contaminated, improperly stored, cooked meats and gravies. B. it is a colitis that is a superinfection. C. it often has an endogenous source. D. it may be on the rise due to increased use of gastric acid inhibitors. E. it is major cause of diarrhea in hospitals