DNA Replication

A segment of DNA is shown.

3' AGGTCAGGT 5'

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 chemical elements present in 4 different samples. Which sample is most likely DNA?

• Sample 1

• Sample 2

• Sample 3

• Sample 4

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 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-LS1-1

NGSS.HS-LS3-1

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

• the location of sugar groups in DNA.

• the sequence of nucleotides in DNA.

• the number of nitrogen 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 a poster board to construct this model of a section of DNA. Which statement describes this model of DNA?

• This 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

Each strand of DNA molecule contains nitrogen 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 a specific protein carried on the DNA molecule?

• As a sequence of nucleotides.

• In the double-helix shape of the condensed chromosome.

• In the ration of adenines to thymines.

• As a pattern of phosphates and sugars.

Tags

NGSS.HS-LS1-1

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.

• 
• 
• 
• 

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

• Providing the instruction for the trait 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 the DNA molecules.

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

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.

• the sequence of DNA that makes up the human genome.

• the double helix structure of DNA.