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Q: DNA and RNA are A. proteins. B. lipids. C. starches. D. nucleic acids.
A: DNA is a nucleic acid.
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User: Glucose is classified as a A. polymer. B. monomer. C. disaccharide. D. polysaccharide.

User: The Octet Rule states that most atoms need ________ electrons in their outer shells. A. 8 B. 6 C. 2 D. 10

User: Which of the following contains both protons and neutrons? A. outer shell B. nucleus C. covalent bond D. ionic bond

User: DNA and RNA are A. proteins. B. lipids. C. starches. D. nucleic acids.

Weegy: DNA is a nucleic acid.
Giana|Points 361|

User: Lipids are a major component of the cell's A. nucleus. B. plasma membrane. C. mitochondria. D. lysosomes.

Weegy: Lipids are a major component of the cell's B. plasma membrane.
vandar|Points 911|

User: Which polymers carry the information for cell growth and reproduction from one generation to the next? A. proteins B. starches C. lipids D. nucleic acids

User: The structure of hair is formed by keratin. Keratin is most likely which of the following polymers? A. nucleic acid B. lipid C. starch D. protein

Weegy: The answer is D. protein
patmarone|Points 5281|

User: Weightlifters are often concerned with the amount of protein in their diets because growing muscles require protein. Just as muscles need the basic building block of protein, protein itself also has basic building blocks. Which of the following are the building blocks of protein? A. monosaccharides B. amino acids C. RNA D. starches

Weegy: B. amino acids
patmarone|Points 5281|

User: Methane, or CH4, is an example of a molecule whose atoms are held together by which of the following? A. hydrogen bonds B. covalent bonds C. metallic bonds D. ionic bonds

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Asked 6/13/2012 9:10:25 AM
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How long ago are prokaryotes believed to have evolved on Earth? A. 3.5 million years B. 1.5 billion years C. 2 billion years D. 3.5 billion years
Weegy: D. 3.5 billion years. The oldest ancient fossil microbe-like objects are dated to be 3.5 Ga (billion years old), approximately one billion years after the formation of the Earth itself. User: Two of the tenets of the cell theory are: All living things consist of one or more cells, and the cell is the smallest unit of life that displays all of the characteristics of life. Which is the third tenet? A. All cells transform energy. B. All cells have cell membranes. C. All cells come from pre-existing cells. D. All cells can become any other type of cell. Weegy: D. All cells can become any other type of cell. he third of the original tenets, Schwann and Schleiden thought cells formed through spontaneous generation, similar to crystals. [ Eventually this tenet was disproven, and a scientist named Rudolph Virchow correctly revised the tenet to state that "All cells only arise from pre-existing cells." The modern understanding of cells explains that they divide to create new cells. One cell essentially splits to make two, and two to make four, etc. Spontaneous generation is not involved. ] (More)
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Expert Answered
Updated 3/24/2014 9:26:21 AM
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2 billion years are prokaryotes believed to have evolved on Earth.
Added 3/24/2014 9:26:21 AM
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