Refer to Figure 47-1. The root of the tooth is made up of the parts labeled:
a. 4 and 5 only
b. 3, 4, and 5 only
c. 1, 2, and 3 only
d. 1, 2, 3, and 4 only
e. 1, 2, 3, 4, 5
D
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The most serious consequence to humans of a decrease in global biodiversity would be the _____
A) increase in global warming and thinning of the ozone layer B) potential loss of ecosystem services on which people depend C) increase in the abundance and diversity of edge-adapted species D) loss of source of genetic diversity to preserve endangered species E) loss of species for use as crops.
Key sequences exist within promoters, which vary somewhat among various promoters but are sufficiently constant that they can be represented by a sequence of bases most often found at each position. These representations are called ________ sequences.
A. consensus B. idealized C. convergence D. common
Why is it so difficult to kill acid-fast bacteria?
A) They are just as difficult to kill as Gram-positive bacteria. B) The acid in the bacteria denatures most antibiotics before they can work. C) Mycolic acid makes it very difficult for nutrients and gases to enter or exit cells. D) The bacteria are very motile and can travel to areas with a lower concentration of hazardous chemicals. E) The bacteria are able to quickly break down several types of antibiotics before the concentration can reach dangerous levels.
Molecules can be described as polar when _____.
A) they are long and thin B) the molecules have a distinct top and bottom C) the electrons in one or more covalent bonds are shared unequally D) they readily dissolve in oil or turpentine