7th grade CSA 3rd nine weeks review

Which of the models most accurately represent the structure of DNA?

• A

• B

• C

• D

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Which of the following best represents amolecule of DNA?

• A

• B

• C

• D

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This is a

• nucleus

• gene

• chromosome

• DNA

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This is where the gene is located and the blueprint of life. What is it?

• Chromosome

• gene

• nucleus

• DNA

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Which characteristic is controlled by the gene?

• How long their eyelashes are.

• How funny their jokes are.

• How many friends they have

• What type of ice cream they like

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Tightly wound bundles of DNA are called

• Chromosomes

• Nuclei

• Phosphates

• Punnett

  Squares

What forms the chemical code within a molecule of DNA?

• The arrangement of phosphates and sugars

• The arrangement of nitrogen bases

• The arrangement of sugar and bases

• The arrangement of chromosomes

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What are the main components of DNA?

• Phosphates, Deoxyribose sugars, nitrogen bases

• Phosphates, oxides, salt

• Deoxyribose sugars, salt, sugar, nitrogen bases

• Phosphates, nitrogen, oxides

This picture shows Rosalind Franklin's x-ray diffraction image of DNA. How did this evidence affect the work of Watson and Crick?

• It was used to discover physical structure of DNA

• It was used to show that chromosomes are made of DNA.

• It was used to identify the four bases that make up DNA.

• It was used to show that DNA is the molecule of inheritance.

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How can genetic variation be introduced into a population of asexual organisms as bacteria?

• Bacterial change and begin to reproduce sexually.

• The environment where the bacteria lives changes the bacteria change.

• Mutations occur randomly in bacterial DNA.

• A bacteria receives genetic information from both parent cells.

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