Which immune cells can kill cancerous cells that lack MHC markers?
a. effector B cells
b. cytotoxic T cells
c. natural killer cells
d. both cytotoxic T cells and natural killer cells
e. all of these
c
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Which of the following are not events in which genetic drift plays a key role?
A. migration B. bottleneck effect C. founder event D. All of the answer options are correct.
Endochondral ossification involves:
A. the formation of bones from a cartilage model. B. the formation of bones from a collagen model. C. the formation of bone tissue directly from osteoblasts laying down bone material. D. the transformation of spongy bone to compact bone. E. the formation of flat bones such as those that make up the skull.
A(n) _cell was used as the donor cell to provide genetic material that produced the cloned sheep, Dolly.5_QC_CS-34450
A. germ-line B. undifferentiated somatic C. mammary gland D. embryonic stem E. egg
An increase to 0.5% carbon dioxide in the air (from the normal 0.03%) makes a person breathe 10 times faster. Which alteration in homeostatic conditions in the blood would limit how long a person can hold their breath?
A. Lack of carbon dioxide raises the pH. B. Lack of oxygen raises the pH. C. Buildup of carbon dioxide lowers the pH. D. Buildup of oxygen lowers the pH. E. Buildup of nitrogen raises the pH.