Which of the following is a function of proteins?
A. Contain information for the cell.
B. Serve as a subunit in the structure of fat.
C. Reduce the weight of an individual.
D. Speed up certain chemical reactions.
D. Speed up certain chemical reactions.
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Water "beads up" on synthetic fabric such as polyester but binds to cotton. What is the most likely explanation for this?
A. Polyester is more flexible than cotton. B. Polyester is not a naturally occurring substance, whereas cotton is a naturally occurring substance. C. Polyester fibers are thinner than cotton fibers. D. Polyester is nonpolar, whereas cotton is polar.
Specialized transduction can be carried out by
A. any bacteriophage. B. only those temperate bacteriophages that integrate into the host chromosome. C. any temperate bacteriophage. D. All of the choices are correct.
Which of the following statements is NOT true
about asteroids? a. They have had little influence on the history of life. b. They do not emit light and are difficult to see. c. Their impacts have produced craters visible in satellite images. d. One asteroid impacted our planet just prior to the mass extinctions at the K-T boundary. e. An asteroid impact releases an enormous quantity of energy.
An evolutionary advancement occurred when organisms became multicellular and acquired a division of labor.
a. true b. false