Homework Ch. 3 – Flashcards
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nucleotides
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Nucleic acids are polymers of ____________.
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nitrogenous base
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The monomers of nucleic acids consist of a phosphate group, a five-carbon sugar, and a ________________.
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DNA (deoxyribonucleic acid)
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____________________ provides directions for its own replication. It also directs cell activities by providing instructions for building proteins.
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RNA (ribonucleic acid)
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A gene provides the directions to build a molecule of ________________; the genetic instructions it carries are then translated into the amino acid sequence of a protein.
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sugar-phosphate
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A polynucleotide has a repeating ______________ backbone.
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double helix
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The structure of DNA is a ____________, held together by the complementary base-pairing of cytosine with guanine, and adenine with thymine.
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polynucleotide
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RNA usually consists of a single ____________ strand.
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amino acids
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Proteins are polymers of _____.
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peptide
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What type of bond joins the monomers in a protein's primary structure?
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secondary structure
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Alpha helices and beta pleated sheets are characteristic of a protein's ___________________.
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hydrogen bonds
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The secondary structure of a protein results from _____.
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peptide bonds
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Tertiary structure is NOT directly dependent on _____.
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RNA
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Which of these is NOT a lipid?
-RNA
-wax
-phospholipid
-steroids
-cholesterol
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double bonds
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The fatty acid tails lack ______________.
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phospholipids
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______________ are composed of a phosphate group, a glycerol, and fatty acids.
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olive oil
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Which of these is rich in unsaturated fats:
-butter
-beef fat
-a fat that is solid at room temperature
-olive oil
-lard
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cholesterol
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_____________ is an important component of animal cell membranes.