Answer the following statements true (T) or false (F)
1. Artificial passive immunity can be effective even after a person has been exposed to the infectious organism.
2. The surface protein on a cancer cell or a microorganism can be an antigen.
3. An antibody and an antigen fit together like a key in a lock.
4. Antigens have the ability to neutralize specific toxins in the body.
5. When an antigen and an antibody unite, macrophages can destroy the antigen more efficiently.
1. TRUE
2. TRUE
3. TRUE
4. FALSE
5. TRUE
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Which of these is NOT and example of chemical bond?
A.ionic bond B.atomic bond C.covalent bond D.hydrogen bond
When they leave the red marrow, pre-T-lymphocytes have
A. only the CD4 protein. B. only the CD8 protein. C. both the CD4 and CD8 proteins. D. neither the CD4 nor CD8 protein. E. either the CD4 or CD8 protein.
An embolus travels in blood while a/an ________is stationary
Fill in the blank(s) with correct word
Which type of stem cell can give rise to any type of cell in the body, except those needed to develop a fetus??
A) ?Multipotent B) ?Pluripotent C) ?Totipotent