Which of the following elements was NOT
included in the Urey-Miller experiments?
a. oxygen
b. methane
c. ammonia
d. water vapor
e. electrical sparks
A
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Rotifers obtain their food by the action of
(a) tentacles. (b) cilia on the wheel organ. (c) a muscular pharynx. (d) pseudopodia.
. Why does wood keep burning once it is lit?
a. Intermediates from the reaction drive the reaction forward. b. Energy is given off during the reaction that drives the reaction forward. c. The products have more energy than the reactants, therefore driving the reaction forward. d. The reactants have more energy than the products, therefore driving the reaction forward. e. The activation of the energy drives the reaction forward.
Chemoreception is critical to most insects. Where do insects detect smells/tastes>
a. Mouthparts b. Legs c. Antennae d. All of the above
What is the role of van der Waals interactions in biological molecules?
1. Van der Waals interactions are strong bonds that play a major structural role in holding proteins together.
2. Although they are weak bonds, van der Waals interactions involve the sharing of electrons.
3. Van der Waals interactions are important only in water.
4. Although they are weak bonds, van der Waals interactions help to reinforce the three-dimensional shapes of large molecules.
5. Van der Waals interactions are too weak to be significant.