B6A DNA

A model of a DNA molecule is shown below. The arrow indicates -

• the bond between adjacent phosphate and deoxyribose molecules

• the junction of introns and exons in the sense strand of DNA

• the hydrogen bond between complementary nucleotides

• the junction of a codon and a DNA triplet

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Characteristics such as a widow's peak or attached earlobes are determined by the genetic code. Which components of DNA are referred to as the genetic code?

• phosphate groups

• nitrogenous bases

• deoxyribose sugars

• hydrogen bonds

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How does DNA in cells determine an organism's complex traits?

• DNA contains codes for proteins, which are necessary for the growth and functioning of an organism

• DNA separates into long single strands that make up each part of an organism

• DNA produces the energy an organism needs in order to grow

• DNA folds into the nucleus of each of the cells of an organism

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The sequence of nitrogenous bases in DNA varies widely. The sequence of the bases in DNA is most important for which of the following?

• providing the instructions for the traits of an organsim

• preventing mutations from occuring during DNA replication

• allowing the DNA to have the shape necessary for replication

• helping form the sugar-phosphate backbone of DNA molecule

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In 1952 Rosalind Franklin took the x-ray photograph shown below, which gave the world its first look at DNA. By studying this photograph, scientists gained knowledge about the -

• role of DNA in protein synthesis

• mutation of nucleotide sequences in DNA

• sequence of DNA that makes up the human genome

• double-helix structure of DNA

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A segment of DNA is represented in the illustration. How is information for a specific protein carried on the DNA molecule?

• as a sequence of nucleotides

• in the double-helix shape of the condensed chromosome

• in the ratio of adenines to thymines

• as a pattern of phosphates and sugars

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A student builds a model of a DNA strand. Which of these models of a DNA strand shows bases that are complementary to the ones on the students DNA molecule?

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Nitrogenous bases are located on both strands of the DNA double helix. What is the significance of the nitrogenous bases?

• the number of adenines and cytosines determines the type of RNA that will be produced

• the order of nitrogenous bases determines the order of amino acids in the proteins synthesized

• the amount of thymine and guanine in the DNA molecules determines the length of the genes

• the type of hydrogen bonding between the nitrogenous bases determines which amino acid will be added to the peptide chain

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Each strand of a DNA molecule contains nitrogenous bases that pair with other nitrogenous bases in very specific ways. A diagram of a section of DNA is shown. Which DNA strand is complementary to the one shown above?

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Differences in traits such as hair texture are determined by differences in -

• the location of sugar groups in DNA

• the sequence of nucleotides in DNA

• the number of nitrogenous bases in DNA

• the molecules attached to the phosphate in DNA

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