What type of protein accelerates the thousands of different chemical reactions that
take place in an organism?
a. enzyme
b. amino acid\
c. transport protein
d. regulatory protein
e. protective protein
a
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In 2011, clinical medical trials using _____ to replace diseased cells in the eyes of blind patients showed some
success of restoring vision.
a. bone marrow cells b. central disk cells c. nervous tissue d. embryonic stem cells e. induced pluripotent stem cells
Which process involves the transfer of heat from the surface of a body to a fluid that passes over the body's surface?
a. convection b. evaporation c. radiation d. conduction
At ________ weeks, the fetal heartbeat can first be heard through a stethoscope.
A. 16 B. 4 C. 12 D. 30 E. 25
Most of the water absorbed by the plant enters through the
A. root cap. B. lenticels. C. root apical meristem. D. stomata. E. root hairs.