Edward Jenner's work involved
A. inoculation of dried pus from smallpox pustules into a person to stimulate immunity.
B. development of an immunization to protect people against cowpox.
C. development of passive immunotherapy.
D. immunization using a related, less pathogenic organism to give protection against a more pathogenic one.
E. All of these choices are correct.
Answer: D
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What is a major difference between the extracellular matrix (ECM) of a plant cell and the ECM of an animal cell?
A) Plant ECM is composed primarily of proteins, whereas animal ECM is mainly carbohydrates. B) Plant ECM is primarily carbohydrate in nature, whereas animal ECM is mainly proteins. C) Plant and animal ECMs are quite similar in structure and function. D) ECM components in plant cells are released extracellularly by the Golgi stacks, whereas lysosomes do this in animal cells.
When reporting a direct smear from a primary specimen, it is important to note the presence and quantity of white blood cells even in the absence of bacteria for all of the following reasons ex-cept:
a. the pathogen may not be present in suffi-cient quantities. b. the presence of white blood cells indicates a purulent process. c. the pathogen may not be present in the sample collected. d. it is not important to report white blood cells unless bacteria are present.
The smooth endoplasmic reticulum has ribosomes attached to it
Indicate whether the statement is true or false
The final three-dimensional shape of a single polypeptide is called its ________ structure.
A. primary B. secondary C. tertiary D. quaternary