Which of the following types of organisms are NOT considered to be part of the plankton?
A. bacteria
B. algae
C. protozoans
D. periphyton
E. viruses
D. periphyton
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You are a doctor examining a patient who had a bad fall. You conduct the patellar reflex test by tapping on his right patellar tendon. The patient's leg does not move in response to your tap. What can you conclude from this test?
A. The patient has definitely sustained a brain injury. B. The patient may have a motor nerve injury. C. The patient may have a sensory nerve injury. D. The patient may have a spinal cord injury. E. More than one of the answers given are correct.
The instrument used to measure blood pressure is called
a. a sphygmomanometer. b. a hemocytometer. c. a hematocrit centrifuge. d. none of the above.
The time it takes for half of a radioisotope’s atoms to
decay a. cannot be calculated. b. is used to construct the geologic time scale. c. is its half-life. d. is the same for uranium 238 and carbon 14. e. is all of these.
Which hormone might be able to counteract the leaf drop caused by leaking street lanterns observed by Dimitry Neljubov?
A. gibberellins B. brassinosteroids C. cytokinins D. ethylene