Microorganisms such as bacteria are able to change and adapt much more quickly than other organisms. Bacterial populations, for example, are able to build a resistance to antibiotics within months, whereas compounds that are toxic to animals remain toxic to animals for many years. One reason for their rapid adaptability is that microorganisms
A. are highly motile
B. have a short life span
C. have specialized organelles
D. are chemosynthetic
Answer: B. have a short life span
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Dorsal roots in the spinal cord contain:
a. motor neurons b. sensory neurons c. interneurons d. cerebrospinal fluid e. ventral roots
Which of the following is a water soluble
vitamin?
a. A b. K c. D d. E e. C
Countercurrent exchange in the gills of fish is an adaptation that accomplishes which of the following?
a. It limits the amount of blood going to the gills. b. It decreases the thermal gradient between water and blood. c. It improves the ability of blood to dissolve oxygen. d. It maximizes oxygen transfer from water to the blood. e. It maximizes heat retention in the fish.
The sources of the ozone-destroying contaminants in the upper atmosphere were found to be ________.
What will be an ideal response?