The complementary base pairs in a DNA molecule are stabilized by:
A) ionic bonds.
B) a salt bridge.
C) hydrogen bonds.
D) covalent bonds.
E) the electrostatic interactions of the charged backbone
C) hydrogen bonds.
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Osmometer cells in the brain sense an increase in the salt concentration of plasma. This information is sent to the hypothalamus, which notifies the pituitary gland to release the hormone, ADH. ADH causes the kidney to save water, which lowers the salt concentration of the plasma. What characteristic of life does this overall pathway represent?
A. Sensitivity B. Energy utilization C. Cellular organization D. Homeostasis E. Evolutionary adaptation
Nucleoplasm is (are)
A. materials inside the nucleus. B. cytoplasm. C. nonliving protoplasm. D. the excessive amounts of particles located in the cytoplasmic region of the cell.
Fill in the blanks to complete the following statements. ? ?Prolonged use of quinolones may cause _________________, which is the appearance of a new infection with a different strain or species of microorganism, during antibiotic treatment
Fill in the blank(s) with correct word
The transfer of DNA fragments from a dead cell to a live, competent recipient cell that results in a changed recipient cell is
A. transformation. B. transmission. C. mitosis. D. transduction. E. conjugation.