An organ must contain at least
A. two different tissue types.
B. two different cell types.
C. all four of the tissue types.
D. connective tissue.
E. two different muscle types.
A. two different tissue types.
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These are the only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart.
A. Mammals B. Amphibians C. Birds D. Fishes E. Reptiles
As officially defined by Congress in the 1964 Wilderness Act, "wilderness" is
A. any area with important scenic, historic, and recreational value. B. undeveloped land where humans have little impact and temporary presence, and visitors can find solitude. C. a place where people live in harmony with nature, building only low-impact structures and roads. D. an area of at least 10,000 acres with no human intrusion. E. an area of at least 10,000 acres with low-impact development by humans
In situ hybridization allows one to "visualize" the location of labeled RNA or DNA in a tissue or cell
Indicate whether the statement is true or false
Which of the following choices are true about the dyes fluorescein and rhodamine?
A.) They can be used to label antibodies in immunofluorescence tests. B.) They emit visible light in response to ultraviolet radiation. C.) They are observed in the fluorescent microscope. D.) They are used to identify pathogens of chlamydiosis, Legionnaires'disease, and others. E. All of these choices are correct.