The reason that this insect can ‘skate’ across the water in a pond is _____
1.its legs make covalent bonds with the water
2.cohesion of the water molecules keeps it from sinking
3.the pH of the water is lower than the pH of the insect’s legs
4.salt in the pond buffers the water so the insect does not sink
2
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A flower with petals, sepals, stamens, and one carpel is ____
a. perfect and incomplete b. imperfect and complete c. imperfect and incomplete d. perfect and complete e. sterile
Which of the following statements is true?
a. When lipids and water are mixed, it is the water molecules that isolate themselves into droplets. b. When lipids and water are mixed, the lipids dissolve and enter into a solution. c. Lipids are nonpolar and will not dissolve in water. d. Polar substances are able to pass through a plasma membrane more readily than nonpolar substances. e. All portions of a phospholipid molecule found in a membrane are classified as nonpolar.
If a trait is genetically determined, the correlation between DZ twins should be lower than that for MZ
twins. Indicate whether the statement is true or false.
Olfactory receptors are located in which one of the following?
A) taste buds B) muscles C) upper part of nasal passages D) skin surrounding nasal openings E) upper regions of mouth