Answer the following statements true (T) or false (F)
1, Antigen-presenting dendritic cells are found in the skin and in the linings of the respiratory and digestive tracts.
2. The function of dendritic cells is to signal T cells, starting an immune response.
3. Experimental gene therapy can be used to treat a form of severe combined immune deficiency, SCID-X1.
4. People homozygous recessive for a 32-base deletion in the CCR5 gene do not become infected with HIV.
5. Mutation of the CCR5 coreceptor may have enabled people to survive various European plagues during the Middle Ages.
1, True
2. True
3. True
4. True
5. True
You might also like to view...
Electron microscopy has greater ________ than light microscopy, because the wavelengths of visible light are much larger than the wavelengths of electrons
A) contrast B) magnification C) resolution D) penetration
Green algae are believed to be the ancestors of the bryophytes. Cite four distinct lines of evidence to support this belief.
What will be an ideal response?
What controls the opening and closing of stomata?
A. leaf shape B. vascular bundles C. guard cells D. mesophyll cells E. Stomata are always open.
Which of the following does not belong in the
clade of class Reptilia? a. turtle b. snakes c. birds d. lizards e. all of these belong