Provide three reasons why the use of aseptic technique is essential when handling microbial cultures in the laboratory.
What will be an ideal response?
1) does not contaminate the culture
2) does not contaminate the handler
3) no contaminates remain after
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Members of the genus Mycobacterium are said to be ________ because basic fuchsin dye cannot be removed even with acid-alcohol treatment.
Fill in the blank(s) with the appropriate word(s).
Which of these adaptation(s) is (are) unique to
mammals? a. hair or fur b. four types of upper and lower teeth that match up c. sweat glands d. secretion of milk by females e. all of these
What is one reason arteries can withstand higher blood pressure than veins?
A) Arteries have one-way valves to prevent blood from flowing backward. B) Arteries contain all types of blood cells, whereas veins contain only erythrocytes. C) Arteries have thick walls that contain layers of muscle and connective tissue. D) Arteries contain only oxygenated blood.
Only dendritic cells produce interleukins
Indicate whether the statement is true or false