Which of the following occurs in all species of living organisms and may lead to an increase in genetic variation?
(A) Mutations in the genome
(B) Crossing-over in meiosis
(C) Random assortment of chromosomes
(D) Alternative splicing of mRNA
Answer: (A) Mutations in the genome
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Four of the five answers listed below are related by a common chemical similarity. Select the
exception. a. cellulose b. hydrochloric acid c. amino acid d. protein e. nucleic acid
Recessive traits are expressed only in the homozygous state. Indicate whether the statement is true or false
In eukaryotic cells, we sometimes find reverse transcriptase activity, even though the cells are not infected with a retrovirus. This activity can be attributed to
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