Repeating DNA sequences that catalyze their own replication and can move to a new location in a genome are called ________
Fill in the blank with correct word.
Answer: long interspersed nuclear elements (LINEs)
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In a grasshopper, how does ion composition of pre-urine compare to hemolymph?
A) Pre-urine is significantly higher in osmolarity (especially with respect to Na+ and K+). B) Hemolymph is higher in osmolarity, conserving its Cl-. C) Pre-urine is similar to hemolymph in ion composition. D) The protein pumps and channels of the Malpighian tubules concentrate Cl- in the pre-urine.
A key is placed into a keyhole then turned and the door opens. Which of the following components of cell signaling would best correspond to the keyhole?
A. the hormone B. the receptor C. conformational change in the receptor once bound to the hormone D. signal transduction E. the cell response
What conditions are likely to apply if the progeny from the cross AaBb × AaBb appear in the 9:3:3:1 ratio?
What will be an ideal response?
Which of the following has the greatest potential as a cancer treatment?
A. Find a way to turn on the gene for making telomerase in normal cells, so that the normal cells would soon outnumber the cancer cells. B. Find a way to turn off the gene for making telomerase in cancer cells, since the cells would stop dividing when the telomeres were gone. C. Find a way to turn off the gene for making telomerase in all cells in embryos, so that they never develop cancer. D. Find a way to turn on the gene for making telomerase in cancer cells, since they will be unable to divide if their telomeres are too long.