In the crystal matrix of ordinary salt, the sodium and chlorine are held together by
A. hydrogen bonds.
B. ionic bonds.
C. peptide bonds.
D. nonpolar bonds.
E. covalent bonds.
Answer: B
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Metabolism describes the ability of a cell or organism to:
a. extract energy from its surroundings. b. maintain itself. c. grow. d. reproduce. e. all of these
Intermediate forms are often absent in characters showing qualitative variation
Indicate whether the statement is true or false.
Using the Linnaean system of nomenclature, corn is named Zea mays. What is the specific epithet in this name?
a. Zea mays b. Zea c. mays d. Quercus e. corn
Which statement best summarizes the major distinction between horizontal gene transfer and vertical gene transfer?
A. Organisms that use horizontal transfer can only reproduce asexually, whereas organisms that use vertical transfer can reproduce sexually or asexually. B. The recipient of genes in horizontal transfer is a mature cell, whereas the recipient of genes in vertical transfer is a progeny cell. C. Genes are more stable in recipient cells following horizontal transfer that in those following vertical transfer. D. Horizontal transfer is observed in bacteria and archaea, whereas vertical transfer is observed in all cells.