Genes and Proteins Learner

Which statement about DNA is true?

• Different people can have the same copy of DNA in their cells.
  

• DNA is made up of genes that carry hereditary information.

• DNA controls the genotype but not the phenotype of an organism.
  

• DNA controls the genotype only in the second and third generations.
  Question

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Which of the following best describes a DNA molecule?

• double helix

• contains ribose

• made of amino acids

• contains Uracil

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When a nitrogen base (nucleotide) is removed from a gene, this is called a ________ mutation.

• removal

• deletion

• substitution

• insertion

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Why is DNA important?

• it is very small and very complicated

• it's in everything

• it serves as the blueprint for traits of all living things

• because we eat it every day for energy

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A segment of DNA that codes for a trait

• gene

• centromere

• chromosome

• chromatid

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What is the main function of genes?

• To provide energy to the cells

• To digest food

• To determine the traits of an organism

• To protect the cell from viruses

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Why are identical twins genetically identical?

• They inherit exactly the same genes from their parents

• They live in the same environment

• They eat the same food

• They are born at the same time

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Which of the following best describes why siblings (except identical twins) do not look exactly alike?

• They inherit different genes from their parents

• They choose different lifestyles

• They eat different foods

• They live in different environments

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How many copies of each gene do you inherit from your parents?

• One copy from each parent

• Two copies from each parent

• One copy from one parent only

• Two copies from one parent and one copy from the other

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What is the shape of the DNA molecule?

• Single helix

• Double helix

• Triple helix

• Quadruple helix