Biol Dna

What would strand II normally include?

• AGC
• TCG
• TAC
• GAT

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 type of hydrogen bonding between the nitrogenous bases determines which amino acid will be added to the peptide chain
• The amount of thymine and guanine in the DNA molecules determines the length of the genes

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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.

• 5'AGU GCU GCG CGU A
• 5'TGT AGC TGC GCG T
• ACA TCG ACG CGC A
• TCG CGC AGC TAC A

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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 model. Which model shows bases complementary to the ones on the student's DNA model?

• CTACCGAC
• GUCGGUAG
• GTCGGAAG
• GTCGGTAG

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 organism
• Preventing mutations from occuring during RNA replication
• Allowing the DNA to have the shape necessary for replication
• Helping form the sugar-phosphate backbone of DNA molecules

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In 1952, Rosalind Franklin took the x-ray photograph shown, 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 model of DNA is shown. 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 fuctioning of an organism
• DNA seperates 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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