Which of the following cells conduct sugars?
a. tracheids
b. vessel members
c. companion cells
d. sieve-tube members
e. more than of these cells conduct sugars
D
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A number of viruses often include a similar set of symptoms when they cause an infectious disease state (fever, headache, fatigue, runny nose). Why would they all cause the same symptoms if they're different viruses?
A. They all possess the same basic virulence genes and molecules, so they all trigger the same responses. B. The symptoms are associated with the immune system's response, NOT the molecules from the pathogens themselves. Our responses against viruses are fairly similar, regardless of virus type, so the symptoms are similar. C. Most viruses infect the upper respiratory tract-this leads to the common set of symptoms listed above. Only a few viruses infect areas away from this region. D. Viruses specifically infect mainly epithelial membranes. As such, the virally induced reaction is similar in different areas of the body due to the same basic cell types (epithelial cells) being infected in each area.
A plant will begin flowering in response to changes in length of daylight, temperature, and light quality. This is an example of which unifying principle of life?
A. Plants conduct photosynthesis. B. Living organisms maintain homeostasis. C. Living organisms interact with their environment. D. Living organisms grow and develop. E. Populations of organisms evolve from one generation to the next.
Drugs delivered in aerosols that dilate bronchioles are used to treat ____________________. Fill in the blank(s) with the appropriate word(s)
A behavioral physiologist is studying the homeostatic control of blood pH. In a trial, a lizard runs on a treadmill for a set amount of time and the blood pH is measured. The blood pH drops as carbon dioxide is released into the bloodstream
Which component of the homeostatic feedback system is responsible for deciding if the blood pH is far enough from normal that a response is necessary? A) effector B) sensor C) integrator D) assimilator