A union between the electron structures of atoms is a(n)
a. chemical bond.
b. hydrogen bond.
c. isotopic bond.
d. physical bond.
e. atomic bond.
A
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Xanthophyll pigments __________
A. prevent formation of reactive oxygen species B. absorb light energy C. convert light energy into heat D. reflect yellow light E. All answer options are correct.
Using the natural processes of cell growth and development to replace diseased or damaged tissue is called:
A. cloning. B. stem cell transplantation. C. genetic engineering. D. regenerative medicine. E. stem cell therapy.
Animal breeders use a _______ to determine whether an organism is heterozygous or homozygous for a particular trait.
a. Punnett square b. reciprocal cross c. test cross d. self cross
Viruses are not considered to be living things, although they can evolve, and they do have genetic material. However, they
a. cannot reproduce on their own. b. cannot cause disease. c. possess a molecular structure entirely different from living cells. d. do not possess DNA. e. do not possess enzymes.