Tumor suppressor genes are often likened to the gas pedal of a car.
Answer the following statement true (T) or false (F)
False
Tumor suppressor genes are often likened to the brake of a car because they inhibit acceleration through the cell cycle. Proto-oncogenes are likened to the gas pedal of a car.
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What is the function of ciliated cells in the conducting zone?
A) propel mucus containing trapped particles toward the glottis B) move macrophages down the conducting zone toward the respiratory zone C) engulf foreign material that has been trapped within the mucus D) provide the rigid support that keeps the conducting zone open E) produce a viscous solution called mucus
In a weakened heart, the heart begins to pump less blood, resulting in blood backing up in the veins causing pressure in veins and capillaries to rise. This condition is called
A) angina. B) congestive heart failure. C) hypotension. D) hypertension. E) atherosclerosis.
Researchers studying groupies in Trinidad found that guppies in streams with high predation reproduced earlier and more frequently. Which of the following is most important in driving the guppies to change their life history in face of predation?
A. The guppies are an equilibrium species. B. The guppies are an opportunistic species. C. Density-independent factors affects the guppy populations. D. Density-dependent factors affects the guppy populations. E. Sexual selection affects the guppy populations.
Within a differentiated B cell, the rearrangement of DNA sequences between variable regions and joining regions is accomplished by a(n)_____
A) RNA polymerase B) reverse transcriptase C) epitopase D) recombinase