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- 1. Multiple Choice
Eight components present in nucleic acids are listed in the box. Which components bond with adenine in a section of double-stranded DNA?
1, 3, 5, and 6 only
3 and 5 only
2 and 4 only
3, 4, 7, and 8 only
- 2. Multiple Choice
A segment of a DNA strand is shown. Which of these is the correct complementary DNA strand for the segment shown?
5' AGGTCAGGT 3'
5' ACCUGAGGU 3'
5' TGGACTGGA 3'
5' TCCAGTCCA 3'
- 3. Multiple Choice
Students are given data from an investigation that identified some of the chemical elements present in four different samples. Which sample was most likely DNA?
Sample 1
Sample 2
Sample 3
Sample 4
- 4. Multiple Choice
Which part of a DNA molecule is responsible for the direct coding of specific traits in an organism?
the number of hydrogen bonds that hold the strands of DNA together
the number of carbons in the DNA molecule
the sequence of nucleotide bases in the DNA molecule
the sequences of phosphates along each DNA strand
- 5. Multiple Choice
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
- 6. Multiple Choice
A student used poster board to construct this model of a section of DNA. Which statement describes this model of DNA?
the model is inaccurate because the base pairs are incorrect
the model is accurate because it contains correctly paired bases
the model is accurate because it shows each base splitting to form a double helix
the model is inaccurate because some typical bases in DNA are missing
- 7. Multiple Choice
A student used poster board to construct this model of a section of DNA. Which statement describes this model of DNA?
the model is inaccurate because the base pairs are incorrect
the model is accurate because it contains correctly paired bases
the model is accurate because it shows each base splitting to form a double helix
the model is inaccurate because some typical bases in DNA are missing
- 8. Multiple Choice
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
- 9. Multiple Choice
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?
- 10. Multiple Choice
A segment of DNA is represented in the illustration. How is information for the 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
- 11. Multiple Choice
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 student's DNA model?
- 12. Multiple Choice
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 occurring during DNA replication
allowing the DNA to have the shape necessary for replication
helping form the sugar-phosphate backbone of DNA molecules
- 13. Multiple Choice
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
- 14. Multiple Choice
A model of a DNA molecule 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
- 15. Multiple Choice
A model of a DNA molecule 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
- 16. Multiple Choice
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
- 17. Multiple Choice
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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