In humans, the locus of the human growth
hormone gene is on chromosome:a.
15.
b. 17.
c. 19.
d. 20.
e. X.
B
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The waxy polymer on the leaves of vascular plants that protects them from pathogens is called
A. lignin. B. cutin. C. chitin. D. cellulose. E. sporopollenin.
Which of the following sequence of events of fertilization is in the proper order?
A. acrosomal reaction, binding of sperm to egg membrane, fast block to polyspermy, increase in egg cytosolic calcium, and then the slow block to polyspermy B. binding of sperm to egg membrane, acrosomal reaction, fast block to polyspermy, slow block to polyspermy, and then an increase in egg cytosolic calcium C. binding of sperm to egg membrane, acrosomal reaction, fast block to polyspermy, increase in egg cytosolic calcium, and then the slow block to polyspermy D. acrosomal reaction, fast block to polyspermy, binding of sperm to egg membrane, increase in egg cytosolic calcium, and then the slow block to polyspermy E. acrosomal reaction, fast block to polyspermy, binding of sperm to egg membrane, slow block to polyspermy, and then an increase in egg cytosolic calcium
Understanding the role of telomerase has helped scientists understand the number of times a cell can divided. If scientists could control the telomerase activity in specific cells, they could potentially stop
A. the formation of cancer. B. aging of cells. C. All of the answer choices are correct. D. meiosis. E. aerobic respiration.
Which of the following is a North American
biome that has mostly disappeared because of extensive farming of wheat and corn?
a. chaparral b. grasslands c. boreal forest d. desert e. more than one of these