Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water. When salt dissolves in water, individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules. Why would this cause ice to melt?
A. Hydrogen bonds are formed, and the salt ions bond with O. As a result, it is more difficult for water molecules to bond and form ice.
B. Hydrogen bonds are broken, and the salt ions interfere with interactions between H and O. As a result, it is more difficult for water molecules to bond and form ice.
C. Hydrogen bonds are broken, and the salt ions bond with O and H respectively. As a result, it is more difficult for water molecules to bond and form ice.
Answer: B
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A. fatty acids that tend to be more saturated. B. All of the choices are correct. C. fatty acids that have more double bonds. D. fatty acids that have lower molecular weights.
Many birth-control pills give a constant amount of synthetic estradiols and progesterone for 21 days, and followed by seven days where no hormones are ingested. These constant hormone levels affect the menstrual cycle in different ways
Which of the following statements most accurately describes the effects of birth control pills? A. Birth control pills inhibit the formation of uterine lining so implantation of a fertilized oocyte cannot occur. B. Birth control pills maintain constant levels of certain hormones so there is no surge in FSH and ovulation does not occur. C. The seven days with no hormones does not allow a thick enough uterine lining to form so a fertilized oocyte cannot implant. D. Birth control pills maintain constant levels of certain hormones and mask the release of the oocyte from the follicle.
What is most likely to happen if the guppy population plotted in Figure 5 is transferred into a habitat with aggressive predators?
A. The population coloration will be brighter. B. The population coloration will be drabber. C. The population will go extinct. D. Either B or C is likely to happen. E. Either A or C is likely to happen.
Which of the following, pertaining to prokaryotic cell membranes, is mismatched?
A. function - regulates transport of nutrients and wastes B. form a bilayer - phospholipids C. internal folds - mesosomes D. unique hydrocarbon present - cyanobacteria E. sterols present - mycoplasmas