Cultured skin substitutes used to treat burns and chronic wounds are extracted from which tissue?
a. bone marrow
b. foreskin from circumcised infants
c. umbilical blood
d. adult skin
e. trachea epithelium
ANSWER: b
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Environmental variation can be used to describe why:
A. Identical twins have different weights. B. Leaves on a single tree turn color at different times in the fall. C. One tomato in a carton spoils before the rest. D. A litter of puppies has siblings of varying sizes. E. All of the above are correct.
Expressed sequence tags are nucleotide sequences derived from cDNA molecules.
Answer the following statement true (T) or false (F)
Oxytocin is a hormone that is involved with increasing contractions during childbirth. The action is
binding to membrane receptors and the result is increasing sodium and calcium. Oxytocin is most likely a
a. peptide or protein. b. steroid. c. carbohydrate. d. prostaglandin. e. fatty acid derivative.
Most of the colors we see around us result from ____
a. reflected light b. direct sunlight c. absorbed light d. the inherent color of the objects we are looking at e. a combination of absorbed and reflected light