Domain 2 – Genetics: 15-Question Assessment

The shape of a DNA molecule is:

• Double helix

• Single strand

• Triple spiral

• Square

The component of DNA that determines the genetic differences between organisms is:

• the sequence of nitrogen bases

• the sugar-phosphate backbone

• the double helix structure

• the number of chromosomes

Tags

NGSS.HS-LS1-1

DNA must be replicated before a cell divides because:

• each new cell needs a complete set of genetic information

• it speeds up cell division

• it prevents mutations from occurring

• it helps the cell grow larger

The molecule that carries the genetic code from the nucleus to the ribosome is:

• DNA

• mRNA

• tRNA

• rRNA

The role of tRNA during translation is:

• to carry amino acids to the ribosome

• to synthesize mRNA from DNA

• to unwind the DNA double helix

• to catalyze peptide bond formation

A sequence of DNA reads TAC. What would the corresponding mRNA codon be during transcription?

• AUG

• UAC

• ATG

• GUA

The type of mutation that replaces one nitrogen base with another is called:

• Frameshift mutation

• Substitution mutation

• Deletion mutation

• Insertion mutation

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NGSS.HS-LS3-2

A mutation in DNA can affect the protein produced by:

• changing the sequence of amino acids in the protein

• increasing the number of chromosomes

• altering the shape of the cell membrane

• preventing cell division

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NGSS.HS-LS1-1

NGSS.HS-LS3-2

Cells with identical DNA become specialized for different functions because:

• different genes are expressed in different cells

• they have different DNA sequences

• they are exposed to different temperatures

• they divide at different rates

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NGSS.HS-LS1-4

What term describes different forms of the same gene?

• Alleles

• Chromosomes

• Genotypes

• Mutations