Which of the following substances protects us
from harmful UV light energy?
a. keratin
b. collagen
c. elastin
d. myosin
e. melanin
E
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The Latin phrase omnis cellula e cellula refers to a cellular principle. Which of the following statements is the best translation of this phrase?
A) Tissues are composed of similar cells. B) Cells generally are found in clusters. C) All cells arise only from preexisting cells. D) Organs are composed of tissues and cells. E) The cell is the basic unit of structure.
Which of the following is (are) specialization(s) that
evolved in land plants that was (were) unnecessary in their aquatic ancestors? a. xylem b. phloem c. stomata d. roots e. all of these
Which animal belongs to a subgroup of arthropods
different from that of the other four? a. horseshoe crab b. shrimp c. mite d. spider e. scorpion
All of the following are true of the polymerase chain reaction (PCR) except:
A. A heat-stable DNA polymerase is used in the reaction process. B. Short pieces of DNA called primers are added to the reaction mixtures. C. Large amounts of DNA must be isolated from the source organism. D. Billions of copies of a DNA sequence are made in a few hours. E. An automated thermocycler is used to heat and cool the reaction samples