An adult stem cell differs from an embryonic stem cell in that it is not
A. totipotent.
B. capable of further cell divisions.
C. able to accept methyl groups.
D. able to produce a blastocyst.
Answer: A
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Metamorphosis is:
A. changing of one body form to another within a species, such as the change from an aquatic tadpole to a terrestrial frog B. an intermediate condition, such as length of legs in mice between longer legs of some mice and shorter legs in others, a condition caused by Hox genes C. the developmental changing of a scale to a feather D. the evolutionary transition from fishes to amphibians E. none of the choices provided
Which of the following substances protects us
from harmful UV light energy?
a. keratin b. collagen c. elastin d. myosin e. melanin
Nicotine mimics ____ in its effects on the nervous system
a. adrenalin b. acetylcholine c. dopamine d. endorphins e. analgesics
When thyroid hormone concentration is low the anterior pituitary secretes less TSH. Indicate whether the statement is true or false