One-thousandth of a meter is a
A) yard.
B) millimeter (mm).
C) micrometer (?m).
D) nanometer (nm).
E) centimeter (cm).
B
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Which of the following statements is
CORRECT about mutation?
a. Mutations caused by environmental factors are always repaired. b. Mutations occurring during the replication process are always harmful. c. Mutations only occur during DNA replication. d. Mutations occurring during the replication process only affect the secondary structure of proteins. e. Mutations are permanent changes in the base sequence of DNA.
Which of the following environmental factors can affect the phenotypes expressed by a genotype?
a. Atmospheric oxygen b. Diet c. Solar radiation d. Humidity e. All of the above cause plasticity f. I don't know the answer
Which of the following statements about the functional groups of organic compounds is false?
A) Functional groups may help make organic compounds hydrophilic. B) Many biological molecules have two or more functional groups. C) Functional groups participate in chemical reactions. D) All functional groups include a carbon atom.
Molecules are generally rigid structures and rarely change shape.
Answer the following statement true (T) or false (F)