Sodium chloride is composed of molecules that are stable when dry. In the presence of water, however, the atoms of the molecules separate from each other. What type of chemical bond holds the dry substance together?
A) hydrogen bonds
B) ionic bonds
C) nonpolar covalent bonds
D) polar covalent bonds
B
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Digestive wastes of the male Ascaris roundworm exit the body through the
(a) anus. (b) cloaca. (c) mouth. (d) excretory pore.
The most ancient type of organisms on Earth originated:
A. 4,004 years ago B. 7,200 years ago C. 2 million years ago D. 3.5 billion years ago E. 13 billion years ago
Match the structures with their appropriate functions:
A. Roots allow plants to obtain water and nutrients, while shoots allow plants to obtain gases and sunlight. B. Roots allow plants to obtain water, nutrients and glucose, while shoots allow plants to obtain sunlight. C. Roots allow plants to obtain glucose, while shoots allow plants to obtain sunlight and water. D. Roots allow plants to obtain carbon dioxide and water, while shoots allow plants to obtain nutrients and oxygen.
During DNA replication, a replication bubble forms but replication forks do not move. This suggests a mutation in the gene coding for___?
a. initiator proteins b. helicase c. primase d. DNA ligase