TEKS 6.A Dna

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

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'

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

Tags

NGSS.HS-LS1-1

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

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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

Tags

NGSS.HS-LS1-1

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

Tags

NGSS.HS-LS1-1

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

Tags

NGSS.HS-LS1-1

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?

• 
• 
• 
• 

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

Tags

NGSS.HS-LS1-1