Dialysis membrane has holes that permit selective passage of molecules; in live cells the equivalent holes in the cell membrane are constituted of:
Ans: proteins
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Almost all the large mammals disappeared from North America by about 10,000 years ago.
A. hotspot B. habitat loss C. edge effects D. megafaunal extinction E. extinction vortex
How has flight been at least partly responsible for the success of the insects? Because of flight,
What will be an ideal response?
During swallowing, the air passageway of the pharynx is covered by the
a. larynx b. epiglottis c. trachea d. bronchi
Which of the following statements about congenital rubella syndrome is FALSE?
A) It is contracted during the first trimester of pregnancy. B) It may be fatal to the unborn child. C) It may result in deafness, blindness, and mental retardation. D) It does not occur with subclinical infections. E) It can be prevented by vaccinating women prior to pregnancy.