North Carolina Biology

Which best summarizes the role of DNA in the production of proteins?

• DNA moves to the cytoplasm to build proteins

• DNA transports amino acids to the ribosomes to make proteins

• DNA contains the instructions used to make proteins

• DNA breaks hydrogen bonds between amino acids

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These diagrams show a variety of cells from the same organism. How can cells from the same organism have such different shapes and functions?

• As each cell differentiates, the DNA changes so that each type of cell has different DNA once it reaches maturity.

• Mutations in the cells' nuclei lead to new combinations of DNA, resulting in different shapes and functions in the different types of cells.

• During differentiation, different parts of the DNA in each type of cell are activated, resulting in the different structure and function of the cells.

• During differentiation, different types of cells produce proteins which destroy the nonactive DNA, leading to cell specialization.

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The chemical colchicine disrupts cell division. Which cell process would most likely stop if colchicine were added to a culture of human liver cells?

• mitosis

• meiosis

• crossing over

• active transport

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Which effect could a mutation in mRNA have on the production of proteins?

• The protein produced will have a different identity.

• The protein produced will have a coiled shape.

• The protein produced will produce excess nitrogen.

• The protein produced will produce excess water.

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Which of the following best describes the process of natural selection?

• Organisms choose their mates based on appearance.

• Organisms with favorable traits are more likely to survive and reproduce.

• All organisms have an equal chance of survival.

• Organisms evolve traits based on their needs.

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What is the powerhouse of the cell, responsible for producing energy?

• Nucleus

• Mitochondria

• Ribosome

• Endoplasmic Reticulum

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How does NC benefit from the biotechnology industry?

• Jobs created

• Farmers have resistant crops

• Healthier animals

• All of the choices benefic NC.

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What is the basic unit of life in all living organisms?

• Atom

• Molecule

• Cell

• Tissue

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What carries the instructions for making amino acids in a protein?

• the nitrogen base on the tRNA

• the hydrogen bonding between nitrogen bases

• the sequence of nitrogen bases on the mRNA

• the nitrogen base bonding on the DNA molecule

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Which word equation best represents the process of cellular respiration?

• carbon dioxide + glucose --> oxygen + water

• carbon dioxide + water --> glucose + oxygen

• glucose + oxygen ---> carbon dioxide + water

• oxygen + water ---> carbon dioxide + glucose

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