What are the major functions of p53?
What will be an ideal response?
Ans: p53's function is to relay information about DNA damage from ATR and ATM through p21 and on to Rb. This will prevent entry into the S phase, arresting the cell cycle until the DNA damage can be repaired. If the DNA damage is too extensive for complete repair, p53 will trigger apoptosis, or programmed cell death.
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Which of the following may show enzymatic
activity? I. lipids II. proteins III. RNA a. I only b. II only c. III only d. I and II e. II and III
Which cell structure is most likely responsible for sensing gravity?
A. Golgi apparatus B. apical meristem C. amyloplast D. central vacuole E. chloroplast
What is the main way that marine teleost fishes deal with the osmotic stress of living in seawater?
a. by active transport of ions out of the body by chloride cells b. by excreting nitrogenous wastes through their kidneys as urea c. by excreting excess salt through the actions of specialized salt glands in their heads d. by active transport of ions into the body through the gills
Compare and contrast the streak-plate method of isolation with the pour-plate method of isolation.
What will be an ideal response?