Based on a patient's medical history, a doctor suspects that the patient may have been exposed to syphilis several years prior. Since the patient is currently asymptomatic, the doctor will be testing to see if the patient is in the latent stage of syphilis. Which of the following would be the most effective way to diagnose syphilis during latency?
A. dark-field microscopy of scrapings from chancres
B. dark-field microscopy of blood specimens
C. culture of blood specimens on syphilis selective agar
D. serological testing of blood specimens
Answer: D. serological testing of blood specimens
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Over 90% of all cells in the nervous system are ____
a. motor neurons b. sensory neurons c. integrator neurons d. interneurons e. glial cells
A population of hummingbirds with a variety of beak sizes finds a new food source in a plant that has a long trumpet flower with nectar at the bottom of the trumpet. Over time, these hummingbirds develop longer beaks. This is an example of
A) directional selection. B) stabilizing selection. C) disruptive selection. D) sexual selection. E) genetic drift.
In experiment 1, you will test multiple food sources to find the one that causes the most weight gain (the "winner"). In experiment 2, you will test the "winner" three times. Why do you have to repeat the experiment three times? Choose ALL that apply.
What will be an ideal response?
The spinal cord is enclosed by the vertebral column and layers of protective membranes. What are these membranes called?
A. Neural net B. Viscera C. Dorsal root D. Meninges E. White matter