Functional groups are very important in organic chemistry. Why are they considered to play such a critical role?
a. Functional groups make molecules resistant to denaturation.
b. Functional groups decrease the molecular mass of the molecule.
c. Functional groups confer special chemical properties to molecules.
d. Functional groups dissolve molecules in water.
c. Functional groups confer special chemical properties to molecules.
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Which of the following is an organic
molecule?
a. carbon dioxide (CO2) b. water (H2O) c. methane (CH4) d. hydrochloric acid (HCl) e. more than one of these is an organic molecule
A free nucleotide has a five carbon sugar (deoxyribose), __________ phosphate groups, and one of
four nitrogen-containing bases. Fill in the blank(s) with the appropriate word(s).
Duplication of DNA occurs
A. during interphase. B. before meiosis II only. C. during prophase I. D. twice, before meiosis I and meiosis II.
Which of the following is a male reproductive structure found in plants?
A. archegonia B. pistil C. pollen cone D. megaspore